Ripeness Groups Research Articles

ПРОДУКТИВНОСТЬ И КАЧЕСТВО КЛУБНЕЙ СРЕДНЕРАННЕГО КАРТОФЕЛЯ В ЗАВИСИМОСТИ ОТ ДОЗ ФОСФОРНЫХ УДОБРЕНИЙ НА СЕРОЙ ЛЕСНОЙ ПОЧВЕ ЛЕСОСТЕПИ СРЕДНЕГО ПОВОЛЖЬЯ

The aim of the research was to determine the optimal dose of phosphate fertilizers on the background of the use of nitrogen-potassium fertilizers in the potato cultivation of the middle-early group of Nevskiy variety. Experiments were carried out on gray forest soil of medium loamy granulometric composition with humus content in the arable layer according to Tyurin - 3.22-3.31%, easily hydrolyzed nitrogen - 140-155 mg/kg of soil, mobile phosphorus - 142-147 mg/kg, exchangeable potassium - 138-151 kg/kg of soil. Nitrogen-potassium background and sulfur in a dose of N90K120S30 were used in the experiments. Phosphate fertilizers were applied, depending on the variant, in increasing doses - P30, P60, P90, P120 kg of active substance. The results of studies on the effect of increasing doses of phosphate fertilizers on the productivity and quality of potato tubers of Nevskiy middle-aged group of ripeness are presented. Analysis of the content’s dynamics of the mobile phosphorus in the irrigated experimental plot of gray forest soil showed that it has a good provision with a mobile form of P2O5. During the growing season on fertilized variants, its content increased with increasing dose of phosphorus and varied in the soil phase of plant development. In the process of research, it was found that fertilizers in a dose of N90K120S30 (background) increased the crop of potato tubers by an average of 4 years by 9.54 tons per hectare. Phosphate fertilizers applied in addition to the background (N90K120S30) as their dose increases from 30 to 120 kg of active substance provided an increase in yield by 1.27-6.34 tons per hectare. The main elements of the mineral nutrition of plants in different ways influenced the quality of potato tubers. The introduction of phosphate fertilizers contributed to an increase in the content of dry matter, starch and improvement in taste in tubers, while the amount of nitrates decreased. Based on the data obtained, it can be concluded that in order to improve the quality indicators of tubers, a dose of fertilizers should be applied - N90P120 K120S30.

АДАПТИВНОСТЬ СОРТОВ КАРТОФЕЛЯ В УСЛОВИЯХ СЕРЫХ ЛЕСНЫХ СРЕДНЕСУГЛИНИСТЫХ ПОЧВ КАЛУЖСКОЙ ОБЛАСТИ

The article proves the need of carrying out researches on the adaptability of potatoes grades in the conditions of gray forest soils in the region. It is shown that efficiently it is possible to use a grade, only having information on its adaptive ability - the major property which accounting has to cause the greatest compliance between a genotype and environmental conditions. Development of scientifically based recommendations about perfecting of elements of technology of cultivation by a path of rational selection of the grades of potatoes combining high efficiency with ecological adaptability and resistance to adverse factors of the external environment was the purpose of researches. method of scientific work - field experiment. Researches are conducted in 2014-2018 on the FGBNU field base Kaluga NISH. Work is carried out according to A technique of researches on the culture of potatoes (M., 1967). Technology of cultivation of culture - traditional with row-spacings of 70 cm. The coefficient of adaptability (KA) determined by the attitude of efficiency of a grade towards srednesortovy efficiency of year was carried out by L.A. Zhivotkov's technique, etc. Data on efficiency and adaptability of 25 grades of potatoes of domestic and foreign selection of early, sredneranny and mid-season groups of ripeness are provided in article. The obtained data allowed to reveal the high-yielding grades which are characterized the external environment raised by resistance to various adverse factors that finds the expression in adaptability coefficient higher than unit. On coefficient of adaptability of a grade were located in the following order: early ripe - Good luck (1.27), (1.26), Aroza (1.02); sredneranny-the Madam (1.26), Ryabinushka (1.1), the Joy (1.08), Ilyinsky, Santa (1.02), Gala (1.0); mid-season - Kolobok (1.21), Irbitsky (1.15), the Miracle (1.02). The listed set of grades is relevant for cultivation in the conditions of gray forest the srednesuglinistykh of soils of the region.

Ecological stability and plasticity of maize hybrids in different groups of ripeness

Abstract. Ecological stability and plasticity of maize hybrids in different groups of ripeness – Knezha 307, Knezha 435, Knezha 509 and Knezha M625 by the traits grain yield and length of the ear was evaluated. The ecological parameters were determined by using the method of Eberhart and Russell (1966) and of Pakudin and Lopatina (1984). In the period of study (2014-2017) the hybrids demonstrate different plasticity and stability by the examined traits. The results of the analysis of the variances demonstrate reliable differences of the hybrids and the conditions for the two traits and primarily reliable interaction genotype – environment. The variances of the regression Si2 of all hybrids for the trait grain yield reliably differ from their theoretical value which determines them as plastic, i.e. responsive to more favourable conditions of growth. According to the values of bi the hybrid Knezha 435 (bi<1) is stable by the trait grain yield, the hybrids Knezha 307 and Knezha M625 are with values of bi close to one and have relatively medium stability and Knezha 509 with bi>1 is unstable. With reliable values of Si2 for the trait length of the ear is only the hybrid Knezha M625. The ecological stability of the other hybrids was evaluated by the value of the coefficient of regression (bi). Increased stability by this trait is demonstrated by Knezha 435, followed by Knezha 509. Knezha 307 is with medium stability (bi=1.1) by the respective trait.

Evaluation of CIMMYT’s Triticum aestivum L. accessions from the 4th WWSRRN for resistance to powdery mildew in the north-eastern forest steppe of Ukraine

Aim. To determine immunological characteristics of CIMMYT’s accessions from the 4th WWSRRN for resistance to powdery mildew in the north-eastern forest-steppe of Ukraine and to select resources of resistance of the train of interest. Results and Discussion. Thirty five CIMMYT’s accessions from the 4th WWSRRN were taken as the test material. Resistance of wheat plants to powdery mildew was assessed on natural infectious background using varieties - infection accumulators (Keprok, Agassis) in compliance with conventional. To determine the yield capacity of the varieties, we analyzed the plant morphology in harvested sheaves. We measured the plant height and 1000-seed weight. The data were statistically processed. We found that the variability of resistance to powdery mildew in the 4th WWSRRN accessions significantly depended on the genotype – 44 %. In a three-year study, we discovered that the highest resistance was intrinsic to the middle-late group (7.3 points), and the lowest one – to the mid-ripening group (6.3 points), though these accessions had the highest adaptability because the variability was 0.8 points. We compared accessions belonging to various ripeness groups. The middle-late group contained the highest percentage of highly resistant genotypes – 83 %. The test accessions were compared with check variety Podolianka for resistance to powdery mildew. Thirteen accessions significantly exceeding the check variety were identified. We distinguished accession Fiorina with high resistance (8.1 points) to the pathogen. Having examined the averages for the 4 ripeness groups, we can state that the highest yields were produced by accessions from the mid-early and mid-ripening groups - 588 g/m2. Therefore, these groups of varieties have the best adaptability. Conclusions. The comprehensive study of the CIMMYT’s accessions from the 4th WWSRRN on natural infectious background using varieties - infection accumulators allowed us to single out accessions with high resistance to the powdery mildew pathogen and other economically valuable characteristics: Cv. Rodina/AE. Speltoides (10 KR), Vorona / HD2402 // Steklovidnaya 24, ETA / K-62905=ESTER, Cv. Rodina / Aе. Speltoides (10 KR). They can be recommended as sources of resistance to the pathogen, high adaptability and performance for programmes developing new breeding material of winter wheat.

ОЦІНЮВАННЯ ЯКОСТІ БУЛЬБ КАРТОПЛІ СОРТІВ РІЗНОЇ СТИГЛОСТІ ЗАЛЕЖНО ВІД УМОВ ВИРОЩУВАННЯ

ОЦІНЮВАННЯ ЯКОСТІ БУЛЬБ КАРТОПЛІ СОРТІВ РІЗНОЇ СТИГЛОСТІ ЗАЛЕЖНО ВІД УМОВ ВИРОЩУВАННЯ

EVALUATION OF COLLECTION SAMPLES OF VEGETABLE BEANS (PHASEOLUS VULGARIS L.) FOR ECONOMICALLY VALUABLE GROUNDS IN THE CONDITIONS OF THE MOSCOW REGION

As part of working on the solution of the task of importing asparagus beans, it is necessary to create a conveyor of green beans for vegetables during the growing season under the conditions of the Central Nonchernozem Zone (CNZ). In this regard, in 2018, work was continued on the evaluation of the existing collection of the FSBSI FSVC on economically valuable grounds, which allowed pre-select promising samples for further breeding work. According to the results of the assessment of the collection variety samples of vegetable beans in 2018, 30 variety samples of different groups of ripeness were identified as initial forms for breeding work on creating varieties that meet the requirements of the processing industry and creating a conveyor for producing asparagus products in the CNZ. Selected varieties are described and evaluated for the productivity of beans and seeds, suitability for mechanized harvesting, quality of the bean, seed size, resistance to the most harmful diseases. It is important to note that the year 2018 was unfavorable for the optimal development of culture due to the negative weather conditions that developed from the 3rd decade of May to the 2nd decade of June. This has made its own adjustments to the development of plants, as a result of which the assessment on some grounds is not indicative.

Optimization of the parameters of quantitative traits of maize hybrids used for grain

The studies were carried out in 2015–2017 at the FSBSI “Agricultural Research Center “Donskoy” in order to determine the opti­mal values of quantitative traits, the combination of which allows forming the maximum yield for hybrids of grain use in arid conditions. The 96 maize hybrids were the initial material which were studied for grain productivity, plant height, height of ear attachment, length of the vegetation period and of the period from germination to ear flowering. The presence, strength and direction of correlation between grain productivity and quantitative characteristics have been established. There has been identified a weak positive correlation between the grain productivity and plant height (r = + 0.10…+0.23). Maize hybrids for grain use should be of medium height with an optimal value of the trait of 220–250 cm. The grain productivity had an average in 2016 (r = + 0.49) and a weak in 2015 and 2016 (r = + 0.05; r = +0.17) dependence on an ear attachment height. The optimal values of the trait were 80–95 cm. The nature of the dependence between grain productivity and the length of the vegetation period greatly differed through the year of study. In 2016 an average positive correlation was r = + 0.52; in 2015 and 2017 there was a weak negative correlation r = –0.14, r = –0.24. Through different years, the hybrids of various groups of ripeness formed the maximum grain productivity of 5.0–5.5 t/ha. The hybrids of the middle-early group of ripening, as well as the early-ripening and middle-ripening hybrids had an advantage before the middle-early group slightly differing in the length of the vegetation period. The optimum length of the vegetation period is 97–110 days, the period from germination to ear flowering is 53–61 days.

The efficiency of foliar treatments of grain crops and potatoes with humic preparation Rostock

Aim: This article describes the results of four field experiments on the effect of foliar treatment with humic preparation Rostock in different phases of the development of spring wheat and oats, and potato varieties of different ripeness groups. Foliar treatment with humic preparation Rostock can be carried out on crops in all phases of development, but the effect in the flowering stage is weaker. Materials and Methods: Experiments on the effect of foliar treatments of humic preparation Rostock on spring wheat and oats were carried out on industrial crops of training experimental farm. Results: All the studied potato varieties have responded to foliar treatment with the Rostock in a tank mixture with an insecticide to increase yield and quality of tubers. Conclusion: Foliar treatment of crops with humic preparation Rostock can be carried out at all phases of development, but the effect at the flowering stage is weaker. All the studied potato varieties have effectively responded to foliar treatment with the Rostock in a tank mix with insecticide.

Display and variability of the sign "mass of seeds per a plant" in the soybeans hybrids and varieties of the different groups of ripeness

Display and variability of the sign "mass of seeds per a plant" in the soybeans hybrids and varieties of the different groups of ripeness

ДИНАМІКА НАКОПИЧЕННЯ СИРОЇ ТА СУХОЇ НАДЗЕМНОЇ БІОМАСИ РОСЛИНАМИ КУКУРУДЗИ В УМОВАХ ЗРОШЕННЯ ПІВДЕННОГО СТЕПУ УКРАЇНИ

The article presents the results of field research with corn hybrids of different groups of maturity for growing them under conditions of irrigation of the Southern Steppe of Ukraine. An important aspect of the use in the production of maize hybrids is the definition and application of optimal parameters of cultivation technology. In the complex of agrotechnical measures that influence the accumulation of crude mass and the growth of dry matter by plants of hybrids of maize of different groups of maturation, the important place belongs to the terms of sowing and the density of plant standing together with the use of irrigation. The accumulation of raw mass is a function of the process of assimilation, determines the productivity of plants, and, accordingly, its economic value. The intensity and duration of the formation of dry matter to a large extent depend on the growth of plants in height, their biological characteristics and the energy of photosynthetic potential. The dry substance, to a greater or lesser extent, consists of spare substances that are produced by plants and used by them as their need for energy. Observation of the growth of green mass is an indicator that reflects the productivity of photosynthesis and the accumulation of assimilation products in plants. With the intensity of growth processes accelerates the formation of the assimilation surface, increases the photosynthetic activity of plants, and therefore their potential yield increases. Therefore, the study of the effect of spatial placement of plants on the area due to the timing of sowing and the density of plant standing on the formation of the leaf surface, the intensity and productivity of photosynthesis and the accumulation of dry matter in hybrids of maize hybrids of different groups of ripeness under conditions of irrigation of the Southern Steppe of Ukraine is relevant and important in evaluation of the obtained crop, depending on the factors taken into consideration. The purpose of the research was to determine the dynamics of the accumulation of over ground mass of corn plants of different groups of ripeness, depending on the time of sowing, hybrid composition and density in conditions of irrigation of the Southern Steppe of Ukraine. The task of the study was to determine the influence of the investigated factors on the dynamics of the accumulation of raw matter and dry matter of maize plants, as well as the parameters of the dispersion, variation and correlation-regression analysis of experimental data. The field experiment, based on the split plot method, was carried out in four-time repetition with the placement of sites in a rendering in accordance with the methodology of conducting field research on the improvement of the elements of agronomic techniques for the cultivation of agricultural crops. In the experiment, hybrids of corn were studied - Tendra, Skadovsky, Kakhovsky; sowing dates – ІІ decade of April, ІІІ decade of April, І decade of May; The density of standing – 70, 80, 90 thousand pieces/ha. Agrotechnics Growing hybrids of maize of different groups of ripeness under irrigation conditions is common for the Southern Steppe of Ukraine, in addition to the factors that were put into study. The research used general sciences (analysis, synthesis, observation, comparison, measurement), special (field, laboratory), mathematical, statistical, and computational and comparative methods. On average, for the 2014-2016 biennium, the maximum wet mass index is set at the milk millet ripeness stage in the medium-old Kakhovsky hybrid crop - 51.39 t / ha for sowing in the III decade of April and a density of 70 thousand pcs / ha. The largest amount of dry matter had plants of the Kakhovsky hybrid during the period of physiological maturation of grain - the value of this indicator, depending on the variants of the experiment, varied within the limits of 21,57-25,18 t/ha. Key words: corn, irrigation, sowing terms, hybrids, standing density, crude mass, dry matter

Вплив ярусів живців пробіркових рослин і живильного середовища на індукцію бульбоутворення картоплі in vitro сортів різних груп стиглості

Вплив ярусів живців пробіркових рослин і живильного середовища на індукцію бульбоутворення картоплі in vitro сортів різних груп стиглості

EVALUATION OF THE COMMON HOP VARIETY SAMPLES ACCORDING TO THE PHENOLOGICAL AND MORPHOLOGICAL FEATURES

The results of study of the 12 year cycle of studies on the only in Russia collection of hops ordinary (Humulus lupulus L.), which contains 250 samples from different regions of Russia and 17 foreign countries. The number of process varieties, composition and origin, it is unique and corresponds to world level. A collection of accessions of hops is a population of female plants with a set of phenological, morphological and economic importance of signs. In the article, the estimation of the collectible varieties of hops at different ripeness groups according to phenological and morphological characteristics according to the method of test for distinctness, uniformity and stability. As the result of the research the Common Hop (Humuluslupulus) sorts were classified in accordance with their maturity time as early maturity (less than 100 days) – 10%, middle-early (101…110 days) – 14, middle duration (111…120 days) – 40, middle-late (121…130 days) – 10% and slow-maturing (more than 130 days) – 26%. Each group has a phenotypic and morphologies features. The early maturity, middle-early and middle duration varieties with vegetative season approximately 120 days are more adaptive to the conditions of the Chuvashia and central part of the Russia and provide obtaining high yield of the hop cones.

Фотосинтетична діяльність посівів гібридів кукурудзи різних груп стиглості в умовах зрошення

Фотосинтетична діяльність посівів гібридів кукурудзи різних груп стиглості в умовах зрошення

Variability features of the early ripeness traits of soybean vegetable and grain forms

It is shown that early biological ripeness of the soybean plant in the region of the Central Nonblack earth area with the low sum of active temperatures and short vegetation season has a significant value in agricultural production. It is not only genetically determined but also depends on the conditions of growing and weather-climatic features within the period of crop growth and development. The variability of the early ripeness traits within the interphase development periods was studied at 190 breeding lines representing the vegetable and grain forms of Russian and foreign origin, with a very early and early ripeness groups in the conditions of 55° N latitude. The duration of the vegetation period of the soybean is represented in the form of the sum of the active temperature. The earliest ripening samples of the vegetable and grain soybean are revealed with the necessary sum of the active temperatures—respectively 1838 and 1757°C in the conditions of Moscow oblast. A low variability of the duration of the vegetative, generative, and vegetation periods is specified. The interphase development periods of the vegetable and grain forms, except for the bud and flower formation periods, also has a weak variability degree, which is important to be considered in the breeding work. It is specified that the vegetable forms of the soybean are characterized by a later ripeness than the grain forms.

Кондиціювання бульб картоплі як елемент технології стабілізації їх якості

At harvesting, transporting, loading and unloading and sorting potato tubers obtained mechanical damages. As a result of injury, the vacuole shells break and the polyphenols that are in them are oxidized by the action of oxygen in the air. Substances that are formed in this way the cause of denaturation of proteins and darkening of potato tubers [1]. As a result, potato consignments can contain up to 40% of products with darkened pulp. Most of all, tubers are injured, which were stored at a lower temperature (less than 6 °C). One of the technological methods, which reduce the level of injury, is the conditioning (heating) of potatoes at elevated temperatures. It was found that increasing the temperature of tubers from 2 to 14 °C helps to reduce their level of injury from 18 to 4% [2]. The purpose of the research: development of optimal temperature regimes for conditioning potato tubers to stabilize their quality. Potato tubers of companies HZPC (Netherlands) and Solana (Germany) which apply to two groups of ripeness: medium-early and medium-ripe were investigated. Potato tubers of the investigated varieties were heated from 4 °C (storage temperature) to 6-24 ° C (temperature change interval – 2 ° C). After than in the potatoes determine density of tubers, the degree of darkening of pulp and the number of darkened tubers. As a result, it was found that in the group of medium- early varieties the optimal conditioning temperature for the Red Lady variety is 8 °C, and for Satina and Mozart – 14 °C, and in the group of medium- ripe: 14 °C for Arosa and 18 °C for Sifra. There is a close relationship between the temperature of conditioning, the degree of pulp darkening and the number of tubers with darkened pulp. Thus, the minimum amount defect in quality of potatoes due to darkening of pulp was obtained: Satina – 5% (temperature – 16 °C), Red Lady – 4% (temperature 8 and 12 °C), Mozart – 2% (temperature 16 °C), Arosa – 6% (temperature 16 °C) and Sifra 3% (temperature 20 °C). Keywords: potato tubers, injury, pulp density, conditioning temperature, pulp darkening, quality stabilization

Level, variability and correlation of quantitative morphological traits and grain quality in rice varietis

Theresultsofthree-year (2013, 2014, 2016) evaluation of characteristics of 10 rice varieties belonging to various ripeness groups for level, variability and relationships between quantitative morpho-biological traits at the Institute of Rice NAAS are presented.The aim and tasks of the study. The study objective was to establish the level, variability, correlations between quantitative morpho-biological traits and grain quality parameters, yield capacity, and growing season duration in rice varieties.Materials and methods. The starting material was 10 rice varieties. They were sown with a SKS-6A seeder at the seeding rate of 7.0 million germinable seeds per hectare. Since a significant amount of plants is lost in rice crops, the plant number was 700 thousand per hectare during the harvest time. The predecessor was alfalfa. The plot area was 5 m2; the space between rows was 15.0 cm. Harvesting was done with a breeding harvester "Yanmar". Plants were analyzed for performance and its structural components (productive tillering capacity, the grain number per panicle, panicle performance, 1000-grain weight) as well as for other morphological (the plant height, panicle length and density, blind-seed disease) and economic (the growing season length, yield capacity) traits. Experimental data were statistically processed by analyses of variance and correlation with calculation of the mean across the experiment and LSD05 and correlation by the BA Dospekhov guidelines.Results and discussion. The study of rice varieties with various vegetation periods established dependence of the yield capacity, growing season length, plant performance, its structural components (panicle performance, tillering capacity), other quantitative characteristics of plants (the grain number per panicle, 1000-grain weight, panicle length and density, plant height) and the grain quality on the genotype.We identified varieties - sources of valuable features, which are starting material for rice breeding. We assessed correlations between 13 quantitative traits of rice and demonstrated a significant close relationship of the plant performance with the grain weight from lateral stalks (0.99–0.99% depending on the year) and a significant medium correlation – with the panicle weight (0.49–0.60%) and with the gain weight per panicle (0.40–0.60%).Conclusions. Performance was found to be directly or indirectly closely associated with the traits of grain weight per panicle and lateral stalks, panicle weight, grains and spikelet numbers per panicle, and density. Thus, selection for any of these traits will facilitate the generation of high-yielding accessions.To develop accession with a high total yield of grits, one should select weakly chaffy rice forms with a low ratio of grain width to its length, high 1000-grain weight and high whole kernel yield.

The water regime and water requirements for spring wheat on groups of ripeness in the southern forest–steppe of Western Siberia

The water regime and water requirements for spring wheat on groups of ripeness in the southern forest–steppe of Western Siberia

Heterosis and degrees of dominance of grain yield and grain yield elements in maize hybrids in different groups of ripeness

Heterosis and degrees of dominance of grain yield and grain yield elements in maize hybrids in different groups of ripeness

INTENSITY OF QUANTITATIVE TRAITS VARIATION OF THE SOYBEAN STARTING MATERIAL

The study of variability degree of the traits-elements of the yield structure in specific soil-climatic conditions is of great importance for the making of highly productive and yielding varieties. The variability of the plant organism is determined by the genetic predisposition and depends on the growing conditions, including the meteorological features of the growing season. To determine the maximum and minimum values of the quantitative characteristics of the initial material, we studied the oscillation coefficient (Vr). It made it possible to estimate the extreme points of fluctuations of variability relative to the mean, showed the potential for the rate of reaction of the geno-types of the introducing soybean samples under changing growing conditions. Comparative field studies of Glycine max L. populations of different origins were conducted in 2015-2016 in the Moscow region conditions and revealed different variability strength of quantitative traits and their data changes. Variation characteristics of yield structure elements were studied in the populations representing 190 soybean Russian and foreign breeding samples of 000-00 ripeness groups. We used assessment of the variation intensity according to the structural yield analysis. Using structural analysis we selected individual plants and made breeding lines with the best combination of yield structure elements. Analysis of variance defined the diversity contribution of different collection samples in total variance of each quantitative trait. We studied the variability of the following indicators: plant height, height of attachment of the lower bean, number of branches per plant, number of beans per plant, number of productive nodes, average number of beans in a node, number of seeds per plant, average number of seeds in a bean, weight of seeds per plant, weight of 1000 seeds. We identified different intensities of each variations, features by years. The suitability of soybean varieties for mechanized harvesting is largely determined by the height of the attachment of the lower bean, which directly affects crop losses. Oscillation of the attachment height of the lower bean was on average high (Vr = 170%). This feature showed a high degree of fluctuations in population limits, which indicates a significant level of influence of modification variability. Variability analysis of yield structure elements revealed the stability of the following signs of breeding samples: average number of beans in a node (V = 21), average number of seeds in a bean (V = 14), weight of 1000 seeds (V = 28). Selection according featured promising starting material is the most rational.

Breeding of sunflower lines for resistance downy mildew in the setting of changing pathogenic races

The aim and tasks of the study . The main objective of this study was to select starting material resistant to downy mildew pathogen for use in breeding programs. Phytosanitary monitoring of crop conditions for pathogen and races was concurrently performed. Materials and methods. Resistance of sunflower lines – pollen fertility restorers to downy mildew pathogen was evaluated in the phase of calathidium formation. Resistance of sunflower accessions to disease was determined by the prevalence of disease. In winter, resistance of accessions to pathogen was evaluated by a rapid method. Plasmopara helianthi races were identified with a triplet set of lines-differentiators. In addition to resistance, we determined ripeness group, plant height and branching type. Variance and correlation analyses were used for statistical processing of experimental data. Results and discussion . Maximum and average values of the disease prevalence fluctuated in the Eastern Forest-Steppe of Ukraine in 2007-2016 (at the maximum 17.5-100% of plants were affected). During half of the study years, the damage level was 1.4-3.3%. High prevalence (11.3-30.7%) was recorded during 3 years (2010, 2014 and 2016.) with excessive precipitation related to the multiyear average (by 14.0-42.4 mm). This is confirmed by close relationship between the average (r = 0.93) and maximum (r = 0.74) values of the disease prevalence and the precipitation amount. Negative correlation was found between these parameters and the average monthly temperature (r = -0.55). Race 330 was the most common until 2006. Since 2010, race 730 has taken a dominant position. In the setting of a prolonged excessively wet spring of 2016, race 732 was identified by response of lines -differentiators to pathogen. The spread pattern of race 730 predicts a probable spread of race 732 for 2017, provided favorable the for pathogen development conditions. Comparing the results of evaluation of sunflower breeding accessions for resistance to downy mildew pathogen in laboratory and field conditions, we identified 33 lines with resistance to 3 races of pathogen - 330, 730 and 732. Most of these sunflower lines - pollen fertility restorers (23) are mid-early; four lines are short-season; and six are early-ripening. They are characterized by various types of branching and plant height. Conclusions. The efficacy of combination of assessment of starting material for resistance to downy mildew in the field conditions in years with wide prevalence and large-scale affection of plants with continuous annual evaluation of breeding material for virulent races in winter in the laboratory conditions was proved. We selected 33 sunflower lines-pollen fertility restorers belonging to different groups of ripeness, which are resistant to 3 races (330, 730 and 732) of downy mildew pathogen and are a basis for new resistant hybrids.