Population Dynamics Of Whitefly Research Articles

Seasonal population dynamics and flight activity of sweetpotato whitefly, Bemisia tabaci on potato in the sub-tropical plains of India

The sweetpotato or cotton whitefly, Bemisia tabaci (Gennadius) transmits the Tomato leaf curl New Delhi virus [potato], and is, therefore, a major concern for quality seed potato production in India. The population dynamics of whitefly was studied for four seasons (2016–2020) in the Jalandhar region of Punjab (India). The whitefly adults appeared on the crop immediately after emergence and peaked (1.5–2.5 per plant) in the first week of November. The adults were found on the crops for 85.58 ± 4.95 days. The average daily temperature emerged as the strongest predictor for population fluctuation of adult whiteflies on potato plants. The native contribution to the whitefly population was negligible as nil or very few pupal exuviae were found on the potato plants. The trap catch was highest in the first 2–3 weeks after crop emergence (15–47 per trap) and decreased abruptly afterward and for the remainder of the sampling dates, very few whiteflies were trapped. The first 2–3 weeks represent the phase when maximum immigration of adults occurs in to the potato crops. The flight activity of the adults continued until the maximum daily temperature did not fall below 13 °C. The information on the pattern of flight activity and population fluctuation will help manage the whitefly virus complex more efficiently for the production of quality seed potatoes.

Population Dynamics of Whitefly and Thrips under Different Row Spacing and Plant Density Conditions in a Cotton Field of Punjab, Pakistan

Population Dynamics of Whitefly and Thrips under Different Row Spacing and Plant Density Conditions in a Cotton Field of Punjab, Pakistan

Population Dynamics of Whiteflies and Associated Viruses in South America: Research Progress and Perspectives.

Simple SummaryWhiteflies are one of the most important and widespread pests in the world. In South America, the currently most important species occurring are Bemisia afer, Trialeurodes vaporariorum, and the cryptic species Middle East-Asia Minor 1, Mediterranean, and New World, from Bemisia tabaci complex. The present review compiles information from several studies conducted in South America regarding these insects, providing data related to the dynamics and distribution of whiteflies, the associated viruses, and the management strategies to keep whiteflies under the economic damage threshold.By having an extensive territory and suitable climate conditions, South America is one of the most important agricultural regions in the world, providing different kinds of vegetable products to different regions of the world. However, such favorable conditions for plant production also allow the development of several pests, increasing production costs. Among them, whiteflies (Hemiptera: Aleyrodidae) stand out for their potential for infesting several crops and for being resistant to insecticides, having high rates of reproduction and dispersal, besides their efficient activity as virus vectors. Currently, the most important species occurring in South America are Bemisia afer, Trialeurodes vaporariorum, and the cryptic species Middle East-Asia Minor 1, Mediterranean, and New World, from Bemisia tabaci complex. In this review, a series of studies performed in South America were compiled in an attempt to unify the advances that have been developed in whitefly management in this continent. At first, a background of the current whitefly distribution in South American countries as well as factors affecting them are shown, followed by a background of the whitefly transmitted viruses in South America, addressing their location and association with whiteflies in each country. Afterwards, a series of management strategies are proposed to be implemented in South American fields, including cultural practices and biological and chemical control, finalizing with a section containing future perspectives and directions for further research.

Population Dynamics of Whitefly and Thrips under Different Row Spacing and Plant Density Conditions in a Cotton Field of Punjab, Pakistan

Population Dynamics of Whitefly and Thrips under Different Row Spacing and Plant Density Conditions in a Cotton Field of Punjab, Pakistan

Population dynamics of whitefly (Bemisia tabaci Genn.) infesting BT cotton and their insecticidal management under field conditions

Studies were taken up to monitor the seasonal occurrence of whitefly population in cotton as well as its insecticidal management under field conditions of Institutional Research Farm, Institute of Agriculture, Visva-Bharati, Sriniketan, during the kharif season of 2018-19. Population reduction of whitefly was done with eight insecticides having different molecular composition and one untreated check. The experiment was drawn in a Randomised Block Design with three replications. The occurrence of whitefly was noticed during the fourth week of July (0.2 whitefly per plant) which continued till late December. Highest whitefly population was found during fourth week of September (12.24 Whitefly per plant). Correlation studies of whitefly population and abiotic factors suggested that whitefly population was significantly correlated with maximum temperature at 1% level of significance. Among the different insecticides tested for population reduction of whitefly in Bt cotton it was noticed that combination product of Imidacloprid 6% + Lambda Cyhalothrin 4%SL @ 500 ml/ha and 450 ml/ha proved most effective and gave 94.15% and 93.81% pest population reduction after second spray imposition respectively.

Effect of Abiotic Factors on Population Dynamics of Whitefly and Jassid on Bt-Cotton

Effect of Abiotic Factors on Population Dynamics of Whitefly and Jassid on Bt-Cotton

Effect of Abiotic Factors on Population Dynamics of Whitefly and Jassid on Bt Cotton

Studies was carried out to investigate population dynamics and the effect of abiotic factors on population dynamics of sucking insect pests of BT cotton whitefly (Bemisia tabaci) and jassid (Amrasca biguttula), under unprotected condition.

Abundance, distribution and population dynamics of Bemisia tabaci on brinjal and tomato

In order to study the abundance, distribution and population dynamics of whiteflies (Bemisia tabaci Genn) in the agriculture farm and homestead garden of Patuakhali Science and Technology University (PSTU) campus and farmer’s field, brinjal and tomato plants were selected as study materials. Results revealed that the highest number of whitefly/plant (3.43) was recorded in brinjal at farmer’s field followed by PSTU farm (1.13) while lowest was in homestaed gardem (1.00) than tomato. The highest percentage of plant attacked per plot by whitefly was recorded in brinjal (16.67%/plot) while the lowest percentage was in tomato (9.76%/plot). The highest mean percentage of B. tabaci adult was observed in the middle canopy (64%) while the lowest was in lower canopy. The highest percent plant attacked (56.25%/plot) was recorded on 2nd March while the lowest attacked (9.09%/plot) was recorded on 15th February. The similar trend was also found in case of tomato. The highest percent plant attacked (56.25%/plot) was recorded on 2nd March followed by 1st April (50%/plot) and 17 March (33.33%/plot) while the lowest attacked (9.09%/plot) was recorded on 15th February followed by 30th January (10.98%/plot).Jahangirnagar University J. Biol. Sci. 7(1): 65-71, 2018 (June)

Effect of Abiotic Factors on Population Dynamics of Whitefly and Jassid on Bt Cotton

Effect of Abiotic Factors on Population Dynamics of Whitefly and Jassid on Bt Cotton

Population Dynamics of Whitefly, Bemisia tabaci and Incidence of Mungbean Yellow Mosaic India Virus (MYMIV) on Blackgram

Population Dynamics of Whitefly, Bemisia tabaci and Incidence of Mungbean Yellow Mosaic India Virus (MYMIV) on Blackgram

Population dynamics of white fly, Bemisia tabaci (Genn.) and Bihar hairy caterpillar, Spilosoma obliqua (Walker) in Black gram

Population dynamics of white fly, Bemisia tabaci (Genn.) and Bihar hairy caterpillar, Spilosoma obliqua (Walker) in Black gram

Study on the Occurrence Regularity of Invasive Whitefly Bemisia Tabaci Population

The B biotype whitefly Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) is an invasive species in China, witch severely damage the production of numerous crops through direct feeding and transmission of plant viruses. In order to clarify the major biological characteristics of a whitefly as an alien invasive species, reveal the seasonal growth and decline of its population quantity, the law of fluctuation from year to year and it's influencing factors and improves the monitoring, prevention and control level. Our study investigates the main biological characteristics and the population quantity's fluctuation of the whitefly Bemisia tabaci in Linhai, Zhejiang province, China. Adult whiteflies were investigated in the greenhouse and field from 2006 to 2011 with using yellow sticky boards. The results show that the whiteflies can produce 11 generations each year with an evident generation overlapping. The number of whiteflies in the greenhouse started to increase from June, with a significant increase after July and then reached its peak during August and September. With the temperature drop, the whitefly population started to decrease after mid-October. The observation of the insects indicated that whiteflies are capable of surviving within the whole year under the greenhouse condition. On the other hand, the overwintering frequency for the whitefly in the open field was approximately 20%. Moreover, the main factors that affect the population dynamics of whiteflies in the field include the initial population number, climate condition, farming system and flood inundation, among which, the temperature condition is the most important.

Effect of Nutrient and Pre-Infested Brinjal, Solanum Melongena by Whitefly and Aphid on Population Dynamics of Whitefly, Bemisia Tabaci

This study investigated the consequence of nutrient concentration levels and pre-infestation of brinjal (Solanum melongena) plant (by whitefly and aphids) on population of whitefly (Aleyrodidae; Hemiptera) over two cropping periods. Both factors, nutrient levels and pre-infestation by pests could also change plant-pest relationship especially with herbi-vorous insect pests. Variation in nutrient levels applied to the plants could influence different physiological performance of the plants which subsequently affected whitefly population. Populations of whitefly were higher following increasing levels of nutrients in non-pre-infested (control) plants. Lower whitefly populations were observed on whitefly pre-infested brinjal plants compared to aphid pre-infested and control plants. Pre-infested plants were suspected to induce productions of sec-ondary metabolites as a chemical defense system thus lowering the number of whiteflies on them. Considering other man-agement technique in controlling whiteflies on brinjal such as optimum nutrient supplement as plant growth progress and good pest care during seedling stage was proposed.

Effects of Living and Synthetic Mulch on the Population Dynamics of Whiteflies and Aphids, Their Associated Natural Enemies, and Insect-Transmitted Plant Diseases in Zucchini

Living and synthetic mulches were evaluated for control of the silverleaf whitefly, Bemisia argentifolii Bellows and Perring, and aphids in zucchini plantings. Two living mulches, buckwheat, Fagopyrum esculentum Moench, and white clover, Trifolium repens L., and two synthetic mulches (reflective and white) were evaluated during the fall of 2002 and 2003. Results from pan-traps, yellow sticky traps, and foliar counts showed that reflective and buckwheat mulches consistently had fewer numbers of adult whiteflies and aphids compared with the standard white mulch treatments. In 2003, a significant increase in the abundance of natural enemies was recorded in all treatments. Living mulch treatments had higher natural enemy populations than synthetic mulch and bare-ground treatments. However, there were no differences in the species diversity of natural enemies found between treatments. The effectiveness of mulches for controlling immature whitefly numbers and the incidence of squash silverleaf disorder were inconsistent between years. Additional data taken at the end of the 2003 season revealed that two viral strains (PRSV-W and WMV-2) were present in the field. However, visual symptoms associated with these viral diseases did not occur until the end of the season.