Cucumber Varieties Research Articles

Сульфаты металлов и морской воды как стимуляторы проростания семян огурца сорта «Феникс-640»

Сульфаты металлов и морской воды как стимуляторы проростания семян огурца сорта «Феникс-640»

Classification of fruit trichomes in cucumber and effects of plant hormones on type II fruit trichome development

Main conclusionCucumber fruit trichomes could be classified into eight types; all of them are multicellular with complex and different developmental processes as compared with unicellular trichomes in other plants.The fruit trichomes or fruit spines of cucumber, Cucumis sativus L., are highly specialized structures originating from epidermal cells with diverse morphology, which grow perpendicular to the fruit surface. To understand the underlying molecular mechanisms of fruit trichome development, in this study, we conducted morphological characterization and classification of cucumber fruit trichomes and their developmental processes. We examined the fruit trichomes among 200 cucumber varieties, which could be classified into eight morphologically distinct types (I–VIII). Investigation of the organogenesis of the eight types of trichomes revealed two main developmental patterns. The development of glandular trichomes had multiple stages including initiation and expansion of the trichome precursor cell protuberating out of the epidermal surface, followed by periclinal bipartition to two cells (top and bottom) which later formed the head region and the stalk, respectively, through subsequent cell divisions. The non-glandular trichome development started with the expansion of the precursor cell perpendicularly to the epidermal plane followed by cell periclinal division to form a stalk comprising of some rectangle cells and a pointed apex cell. The base cell then started anticlinal bipartition to two cells, which then underwent many cell divisions to form a multicellular spherical structure. In addition, phytohormones as environmental cues were closely related to trichome development. We found that GA and BAP were capable of increasing trichome number per fruit with distinct effects under different concentrations.

INTERACTION EFFECTS OF SEASONS AND FARMING PRACTICES ON CORRELATION AND PATH ANALYSIS OF YIELD OF CUCUMBER (Cucumis sativus L.)

Association among yield characters is a pre-requisite for rapid crop improvement. A study was conducted to determine the effect of seasons and stake on correlation and path effects of cucumber yield traits. The experiment comprised of 2 seasons (wet and dry), 2 practices (staked and unstaked), six cucumber varieties replicated three times in a Randomized Complete Block Design (RCBD). Planting distance was 75×75 cm. Insect pests, weeds, and fungi were controlled as recommended. Data collected were subjected to correlation and path effect analysis. In the dry season, the two practices revealed highly significant genotypic correlation (P<0.05) between fruit yield and vine length (rg= 1.20 and 1.07) and phenotypic (rp=0.69 and 0.74). With days to flowering, fruit yield displayed highly significant genotypic (rg=-1.14 and -1.03) and phenotypic correlation (rg=-0.74 and -0.76). In the wet season, the two practices revealed highly significant positive genotypic (rg=0.95 and 0.84) and phenotypic correlation (rg=0.84 and 0.71) between fruit yield and fruit length. Path analysis showed that high yield was achieved in the dry season through the maximum effect of fruit girth 0.34 and 1.15 in the two practices and shorter days to flowering -0.39. In the wet season, maximum fruit yield was obtained through fruit length (5.86 and 0.28) in both practices, in addition to less fruit girth (-6.76) and short days to flowering (-0.67). In selection for high yields, the characters; vine length; fruit girth, fruit length and days to flowering can be utilized.

Pseudoperonospora cubensis virulence and pathotype structure in Kazakhstan

Severe epidemics of cucurbit downy mildew caused by Pseudoperonospora cubensis have been observed in recent years in major cucumber‐producing regions in Kazakhstan. However, information on the pathogenic variability of P. cubensis that could facilitate screening of candidate cucumber varieties and hybrids prior to deployment for commercial production is currently not available. A total of 112 isolates were collected from 2014 to 2016 during surveys in three major cucumber‐producing regions of Kazakhstan. Single lesion isolates were tested for their compatibility with a differential host set composed of 12 genotypes. Most isolates were compatible with Cucumis sativus and C. melo subsp. melo, while none were compatible with Citrullus lanatus. Isolates differed primarily by their virulence to C. pepo subsp. pepo and Benincasa hispida. Based on the patterns of compatibility with the differential host set, 29 pathotypes were identified. Of these, 18 were associated with a specific production region, six occurred in two regions and five were present in all three regions. The number of virulence factors (VF) ranged from 2 to 10, with 65% of the pathotypes having eight or more VFs. Indices of diversity showed that virulence was very diverse within the pathogen populations. Clustering of pathotypes based on similarity in virulence showed the existence of two main clusters. The high pathogenic variability observed in this study suggests that newly developed cucumber varieties and hybrids with resistance to cucurbit downy mildew need to be evaluated against a wide range of pathotypes prior to their deployment for commercial production in Kazakhstan.

Влияние возраста семенников огурца на посевные и продуктивные качества семян

Посевные качества семян характеризуются их пригодностью к посеву и хранению и во многом определяются гидротермическими условиями в период их созревания и уборки. Одним из лимитирующих факторов возможности получения высококачественных семян в конкретной зоне считается сумма активных температур выше 15 °C. Определены сроки уборки семенных посевов и их влияние на урожайные свойства огурца сорта Амурчонок. Опыты проводили на овощном участке в 2012 – 2015 гг. в условиях Приамурья. Сумма активных температур за время опыта составила 850 – 950 °C, которая накапливалась минимум за 45 дней с момента наступления женского цветения и до сбора семенных плодов. Семена по посевным качествам отвечали посевным стандартам. Для определения сроков уборки семенные плоды собирали через 40, 45, 50 и 55 дней. Используя на посев такие семена, возможно получить урожай зеленца с максимальной товарностью 78,1 %. Максимальная урожайность отмечена в варианте при посеве семенами из семенников 55-дневного возраста. Общий урожай в данном варианте выше, чем в других вариантах, на 38,0 – 87,3 ц/га, а урожай стандартных плодов — на 23,7 – 55,3 ц/га. Наименьший урожай отмечен на растениях, выращенных из семян 40-дневного возраста, однако в данном варианте товарность плодов оказалась максимальной и в среднем составила 79,2 %. Установление сроков уборки семенных посевов того или иного сорта огурца позволит сельскохозяйственным товаропроизводителям получать максимальную прибыль и не допустить потерь семян из-за перезревания семенных плодов.

NASLEDNIK – A NEW VARIETY OF CUCUMBER OF THE FAR EASTERN BREEDING

Breeding work on cucumber culture is conducted in many scientific research institutions and selection and seed-growing firms. The priority direction in the breeding of cucumber in the Far Eastern Research Institute of Agriculture is the creation of bee-dusted varieties for open ground, adapted to local conditions with a sharply variable hydrothermal regime and a high natural infectious background, where the most dangerous of cucumber diseases are downy mildew (peronosporosis) and angular spotting of the leafs (bacteriosis). The breeding and introduction of disease-resistant varieties and hybrids in to practice is the most effective and cheapest method of combating plant diseases, as it is the only way you can get guaranteed yields. A new variety of cucumber Naslednik was obtained as a result of testing promising cucumber varieties at the Far Eastern Research Institute of Agriculture and was handed over in 2016 in the State Variety Test. The variety is medium-ripening, bee-dusted. The fruiting occurs 44-47 days after the emergence of mass shoots. The green fruits are elongate-ovoid form 10-12 cm long, 3.5-4.0 cm in diameter and with a fruit weight of 100-120 g. The average total yield of the fruit is 38.9 t/ha, the marketable – to 31.6 t/ha, respectively to the standard (variety Mig) obtained 35.1 t / ha and 27.4 t/ha. The most valuable qualities of the new variety are resistance to peronosporosis and bacteriosis, a high yield of marketable fruits (80-82%), slowly turning brow fruits.

Dynamic modeling of cucumber crop growth and uptake of N, P and K under greenhouse conditions

Abstract One of the available tools used to increase the productivity of crops is the mathematical modeling. This allows us to design management strategies without the need for expensive experiments; however, this technology has been applied mainly to tomato under greenhouse conditions. For other crops, there is not enough information available. As to generate the necessary information for the calibration and validation of a dynamic growth and mineral absorption model –originally implemented in tomato cultivation– two cycles of cucumber (Vitaly and Luxell varieties) were carried out mainly because cucumber stands out as one of the crops that is mostly grown under greenhouse conditions. Mineral analyzes (N, P and K) were performed to determine their behavior in the different cucumber organs during the development of the crop. The percentages of minerals contained in each organ and in the whole plant were obtained. These percentages were included in the mathematical model in order to dynamically simulate their behavior. The results show that the growth model output adequately simulates leaf and fruit weight (EF > 0.95 and Index > 0.95), as well as indices above 0.95 for harvested fruit and leaves. Regarding minerals, indices above 0.90 were obtained, where N was the element that showed the lowest indices during the validation process of the model (0.90). This model can be useful to define adequate nutrition strategies for Vitaly and Luxell cucumber varieties.

PENGARUH PEMBERIAN BERBAGAI KONSENTRASI ETHEPON TERHADAP PERTUMBUHAN DAN PRODUKSI TANAMAN MENTIMUN VARIETAS LOKAL DAN ANTARA (Cucumis sativus L.)

Research on the effect of giving various concentration ethepon to growth and production of cucumber was conducted in Nagari Kacang Kecamatan X Koto Singkarak, Solok, West Sumatra, from June to August 2008. The objectives of the study were (1) get interaction between several concentrations of ethephon with cucumber varieties, (2) obtaining the best ethepon concentration, (3) and knowing cucumber varieties that have better production. Factorial-factored experiments in Randomized Block Design with 2 factors and 3 groups. The first factor of ethepon concentration consisted of five levels 0, 100, 200, 300, 400 ppm. The second factor is cucumber varieties of Local and Antara varieties. Observed variables: plant length, number of branches, when first male flowers appear, when the first female flowers appear, the number of male flowers, the number of female flowers, the number of straight fruit, the number of fruit is not straight, the fruit weight is straight, fruit weight is not straight. Providing ethepon concentration with crop varieties has an effect on growth and production of cucumber , that is when the first male flowers appear (hst). Provision of ethepon concentration of 200 ppm showed a better effect on the number of female flowers, the number of straight fruit, and the weight of the fruit straight. Factor varieties, singularly different to plant length variables, when the first female flowers appear, the number of straight fruit, the number of crooked fruit, the weight of the fruit straight, and the weight of the bent fruit. Local varieties show better production than Antara varieties.

不同黄瓜品种在种子萌发期对NaCl盐胁迫的响应

用150 mmol/L NaCl盐溶液对10个不同黄瓜品种进行芽期胁迫处理,调查9个生理指标的变化，采用隶属函数法综合评价不同品种黄瓜的耐盐能力。结果表明:不同黄瓜品种的不同生理指标对NaCl盐胁迫的响应不同。采用隶属函数法，综合评价10个不同黄瓜品种的耐盐能力依次为秀丽旱黄瓜 > 津耘黄瓜 > 玉宝、本地黄黄瓜 > 春宝王中王 > 本地王黄瓜、春秋旱黄瓜 > 绿翡翠 > 如玉 > 韩研银丰黄瓜。 10 cucumber varieties were treated with 150 mmol/L NaCl salt solution at seed germination stage, and 9 physiological indexes were investigated. The salt tolerance ability of different cucumber va-rieties was evaluated by membership function method. The results showed that different physio-logical indexes of different cucumber varieties had different responses to NaCl salt stress. The salt tolerance ability of 10 different cucumber varieties was evaluated as follows: xiulihan > Jinyun > Yubao, local yellow > spring Baowangzhongwang > local king, chunqiuhan > lvfeicui > Ruyu > hnayan Yinfeng.

Selection of optimal design of polyhouse and suitable variet-IES of salad cucumber under humid tropical climate

Selection of optimal design of polyhouse and suitable variet-IES of salad cucumber under humid tropical climate

Semenska proizvodnja krastavca i njene specifičnosti

Seed production of cucumber differs from mercantile production and has a number of specific characteristics. The conditions of successful production are the selection of plots, the proper selection of pre-crop and adequate and timely irrigation. When fertilizing, there have to be taken into account the feeding of nutrients, the state of fertility of the soil and the planned yield of the fruit (although only seed is extracted). The factors of key importance include: sow density, cropping, hoeing between rows of crops, the protection of crop from weeds, causes of diseases and pests and the moment of harvesting the fruit. Other important factors are the determination of ripening, the duration of fermentation, washing and drying of seed. As with any seed production, there are to be observed legal regulations regarding spatial isolation, varietal purity and adult-ration with other plant species and weeds. Only the production and trade of seed of cucumber varieties included in the list of agricultural and forestry varieties is permitted. The minimum seed quality prescribed by the law: the minimum purity of 98%, the minimum germination of 80%, no presence of weeds and other plant species, while the maximum moisture in the seed is 14%.

SCREENING TECHNIQUES FOR DOWNY MILDEW RESISTANCE IN GHERKIN CUCUMBERS

Downy mildew (Pseudoperonospora cubensis) causes significant losses in cucurbitaceous crops worldwide. P. cubensis isolates were obtained from infected cucumber leaves in Lampang province, Thailand during 2010-2012 in order to determine the downy mildew virulence. The isolates were tested for the presence of highly compatible reactions on specific hosts and categorized as the pathotype 3. This study determined a screening technique that could improve downy mildew resistance of gherkin cucumber lines (Cucumis sativus L.) grown under greenhouse and field conditions including inbred lines, gherkin varieties and hybrid parents of cucumbers. The pedigree method was applied to four generations of gherkin cucumber lines (F2-F5). The results showed an average mildew resistance score for 8 elite gherkin lines from the F5 generation after 40 days of transplanting. The score of the 8 elite lines was less than an average score for other gherkin and commercial cucumber varieties and was equivalent to an average score for downy mildew resistant varieties. On average, these 8 elite lines from the F5 generation had maximum yields as measured by a mean output of 26.9 tons per hectare (more than that of other gherkin cucumber varieties), mean fruits per plant of 32.6 fruits, and a mean weight of each fruit of 19.4 grams. It was concluded that a disease resistance breeding program using this screening technique and its application was successful in controlling and improving gherkin cucumber lines resistance to the downy mildew pathogen, and which led to increased productivity.

The complete chloroplast genome sequence with a novel 24-bp deletion of a Korean solid green-type cucumber variety (Cucumis sativus var. sativus)

Cucumber (Cucumis sativus var. sativus) is one of the economically important vegetable crops. In this study, we characterized the complete chloroplast genome sequence of inbred line ID YHB bred from Korean solid green-type cucumber variety, through de novo assembly using next-generation sequencing. The chloroplast genome is 155,501 bp long and has typical quadripartite structures and gene contents as found in reported cucumber chloroplast genomes. Interestingly, sequence comparison revealed a novel 24-bp deletion present only in the chloroplast genome of the inbred line. Phylogenetic analysis confirmed that the inbred line was closely grouped with cucumber cultivars.

Resistance Test of Several Varieties and Critical Phase for Cucumis Sativus towards Cucumber Mosaic Virus Infectio

The present study was intended to obtain resistant cucumber varieties and to know the critical phase of cucumber plant towards Cucumber Mosaic Virus infection (CMV) therefore, it could be used as a basis for controlling the mosaic disease spread of CMV-induced at cucumber plants. The research was conducted in Baturiti Village Tabanan Bali within an insect-proof greenhouse. Elisa test was performed using CMV, WMV and PRsV antiserum. The resistance test of several cucumber varieties included Roberto, Harmony, Citra baby and Manggala was conducted by mechanical transmission from CMV inoculum source sap. Testing of cucumber plant critical phase of CMV infection was done by mechanically inoculating sap from CMV infected plant, for healthy cucumber plant as testing plant i.e. inoculation at 2, 3, 4, 5 and 6 weeks after planting and control (plant without CMV inoculation). An observation was done for incubation period variables, disease incidence, disease severity and crop yield. The results and conclusions of the four cucumber varieties tested were not found to be CMV resistant varieties, however, the moderately sensitive Harmony varieties deserve attention for choosing in the cultivation. The cucumber plant that was CMV infected from the age at planting until 4 weeks after planting shows 100% disease incidence and plants could not produce fruits. The critical phase of cucumber plant towards CMV infection occurred from the time at planting until 4 weeks after planting.

Investigation on effect of time of planting in cucumber (Cucumis sativus L.) under polyhouse conditions in Manipur, India

An experiment on the standardization of time of planting for growing cucumber(Cucumis sativus L.) inside polyhouse was conducted during 2010-11 at the Horticutural Experimental Field, College of Agriculture, Central Agricultural University, Imphal (Manipur), India. The experiment comprised of four dates of planting (September, October, November and December) and two cucumber varieties viz.Alamgir CT 280 and Alamgir CT 380, in Factori-al Randomised Block Design with three replications and eight treatments.Impact of time of planting was established on vegetative characters; flowering and fruiting characters; yield and yielding attributes. Effect of different time of planting and variety on growth of cucumber was found to produce significant effect (at 5% level of probability) on main vine length, numbers of leaves per plant and leaf area. For both the varieties, September planting gave maxi-mum values of main vine length (221.93 cm and 240.51 cm, respectively), number of leaves per plant (21.21 and 21.92, respectively) and leaf area (393.26 cm2 and 413.76 cm2, respectively). The treatment combination of Septem-ber planting with Alamgir CT 280 gave shorter number of days (12.6) from fruit set to maturity. The different time of planting and varieties and their interactions showed significant effect on number of fruits per plant, fruit length (cm), fruit diameter (cm), single fruit weight (g), fruit yield/plant (kg) and fruit yield/ha (t). The results revealed that the treatment combination of September planting with Alamgir CT 380 gave the highest yield (47.31t/ha), as compared with October, November and December plantings. However, the maximum cost- benefit ratio (1: 2.24) was found in October planting. The present study suggests that cucumber can be grown successfully during winter months under polyhouse in Manipur, India condition.

Resistance levels of cucumber to Podosphaera xanthii in a growth chamber are related to haustorial formation and hyphal branching frequency

To clarify relationships between powdery mildew resistance of cucumber and hyphal developmental state of the pathogen, haustorial formation and the hyphal branching frequency were compared among cucumber varieties that differ in resistance levels to powdery mildew pathogen Podosphaera xanthii. Cotyledons of four cultivars were inoculated with P. xanthii. By 2 days after inoculation, secondary haustoria had developed from the first hyphal cell that formed beside the conidium in susceptible cultivars. The fungus on susceptible cultivars also tended to have hyphal branches just after the hyphal cell producing haustoria.

Effects of pruning on growth and yield of cucumber (Cucumis sativus) Mercy variety in The acid soil of North Kalimantan, Indonesia

Mardhiana, Pradana AP, Adiwena M, Kartina, Santoso D, Wijaya R, Maliki A. 2017. Effects of pruning on growth and yield of cucumber (Cucumis sativus) Mercy variety in The acid soil of North Kalimantan, Indonesia. Cell Biol Dev 1: 13-17. In recent years, cucumber production in Tarakan, North Kalimantan only reaches 20 tons ha-1. In fact, cucumber production potential could reach 49 tons ha-1. Several factors that limit the low productivity of cucumbers in Tarakan are acid soil and cultivation techniques which are still limited. This study aimed to determine the effect of pruning on the growth and yield of cucumbers in acid soil in Tarakan. The study was conducted using Randomized Complete Block Design with the treatment of without pruning (P0), shoot of prunings on the main stem (P1), pruning of whole lateral branches above the third section (P2), and pruning of 2 lateral branches that emerged first above the third section (P4). The results showed that plant height was 16.17% (P1) and 2.26% (P2) lower also 0.13% higher (P3) than the control (P0). The highest number of leaves was found in treatment P1 (16.19%) compared to P0. The best fruit diameter was also found in P1 treatment with 4.93% difference compared to P0. Furthermore, a highly significant and the best result on weight per fruit were also obtained by P1 treatment. The results showed that the fruit weight of P1 treatment (11.39%) was higher than P0. This study provided new information that the pruning treatment of shoots on the main stem of cucumber variety Mercy in acid soil could increase the diameter and weight of cucumber.

Effects of vermicompost amendment as a basal fertilizer on soil properties and cucumber yield and quality under continuous cropping conditions in a greenhouse

PurposeWe examined the effects of vermicompost application as a basal fertilizer on the properties of a sandy loam soil used for growing cucumbers under continuous cropping conditions when compared to inorganic or organic fertilizers.Materials and methodsA commercial cucumber (Cucumis sativus L.) variety was grown on sandy loam soil under four soil amendment conditions: inorganic compound fertilizer (750 kg/ha,), replacement of 150 kg/ha of inorganic compound fertilizer with 3000 kg/ha of organic fertilizer or vermicompost, and untreated control. Experiments were conducted in a greenhouse for 4 years, and continuous planting resulted in seven cucumber crops. The yield and quality of cucumber fruits, basic physical and chemical properties of soil, soil nutrient characteristics, and the soil fungal community structure were measured and evaluated.Results and discussionContinuous cucumber cropping decreased soil pH and increased electrical conductivity. However, application of vermicompost significantly improved several soil characteristics and induced a significant change in the rhizosphere soil fungal community compared to the other treatments. Notably, the vermicompost amendments resulted in an increase in the relative abundance of Ascomycota, Chytridiomycota, Sordariomycetes, Eurotiomycetes, and Saccharomycetes, and a decrease in Glomeromycota, Zygomycota, Dothideomycetes, Agaricomycetes, and Incertae sedis. Compared to the organic fertilizer treatment, vermicompost amendment increased the relative abundance of beneficial fungi and decreased those of pathogenic fungi. Cucumber fruit yield decreased yearly under continuous cropping conditions, but both inorganic and organic fertilizer amendments increased yields. Vermicompost amendment maintained higher fruit yield and quality under continuous cropping conditions.ConclusionsContinuous cropping decreased cucumber yield in a greenhouse, but basic fertilizer amendment reduced this decline. Moreover, basal fertilizer amendment decreased beneficial and pathogenic fungi, and the use of vermicompost amendment in the basic fertilizer had a positive effect on the health of the soil fungal community.

Expression and functional analysis of the transcription factor-encoding Gene CsERF004 in cucumber during Pseudoperonospora cubensis and Corynespora cassiicola infection

BackgroundCucumber downy mildew, caused by P. cubensis, is an important leaf disease that can severely affect cucumber production. In recent years, cucumber target spot, caused by C. cassiicola, has been reported in both Asia and Europe and is now considered as a major disease disrupting cucumber production. Single-disease-resistant cucumber varieties have been unable to satisfy production needs.To explore the molecular mechanisms of cucumber resistance to these two diseases, cucumber cultivars D9320 (resistant to downy mildew and target spot) and D0401 (susceptible to downy mildew and target spot) were used as experimental materials in this study. We used transcriptome sequencing technology to identify genes related to disease resistance and verified using transgenic technology.ResultsWe screened out the cucumber resistance-related gene CsERF004 using transcriptome sequencing technology. Induction by pathogens, salicylic acid (SA), and ethylene (ET) resulted in the up-regulation of CsERF004. Three treatments, namely, inoculation with C. cassiicola alone, inoculation with P. cubensis alone, and simultaneous inoculation with both pathogens, all resulted in the significant and sustained up-regulation of CsERF004 in the resistant cultivar D9320, during the early stage of infection. In the susceptible cultivar D0401, CsERF004 expression was also significantly up-regulated at the later stage of infection but to a lesser extent and for a shorter duration than in the resistant cultivar D9320. The CsERF004 gene encodes a protein localizes to the nucleus. The over-expression of CsERF004 in the susceptible cultivar D0401 resulted in the significant up-regulation of the CsPR1 and CsPR4 genes and increased the levels of SA and ET, which enhanced the resistance of cucumber to downy mildew and target spot.ConclusionsAnalyses of the CsERF004 expression pattern in disease-resistant and susceptible cucumber cultivars and transgenic validation indicate that CsERF004 confers resistance to P. cubensis and C. cassiicola. The findings of this study can help to better understanding of mechanisms of response to pathogens and in establishment the genetic basis for the development of cucumber broad-spectrum resistant cultivars.

EFFECT OF PLANTING DATES AND SPACES ON THE INFESTATION OF CUCUMBER VARIETIES WITH TWO-SPOTTED SPIDER MITE, TETRANYCHUS URTICAE KOCH

Field experiments were conducted to study the effectiveness of three cucumber planting dates (March, 15th; April, 15th and May, 15th), three planting spaces (20, 30 and 40 cm) between cucumber seeds and three varieties of cucumber (Al-Zaeim, El-Nemse and Prince) on the population densities of Tetranychus urticae Koch during 2015 and 2016 seasons. The results indicated that, the three variables (planting dates, spaces and varieties) had pronounced effects on the numbers of T. urticae movable stages on cucumber plants. The population density of T. urticae movable stages was affected significantly by the tested planting date, the earliest planting date (March, 15th) harboured the lowest population of T. urticae movable stages (6.62 and 4.78 individuals/inch2) in the two seasons, respectively. Cucumber plants cultivated at the longest planting space (40 cm) infested by the lowest rate of T. urticae movable stages (6.22 and 4.42 individuals/inch2) in the two seasons, respectively. The tested cucumber varieties showed significant differences in the infestation rates by T. urticae movable stages. Al-Zaeim variety was the least infested by T. urticae movable stages (9.27 and 6.12 individuals/inch2) for the two seasons, respectively. The results revealed that the lowest seasonal mean of infestation was 1.08 and 0.36 individuals/inch2 during the two tested seasons, respectively on cucumber plant (Al-Zaeimvariety) sown at the largest space (40 cm) during earliest planting date (March, 15th). While the highest infestation levels (37.03 and 35.33 individuals/inch2 in the two seasons, respectively) occurred on cucumber plants (Prince variety) planted at the closest planting space (20 cm) during last planting date (May, 15th).