nymphal survival and crawler movement of bemisia tabaci (homoptera: aleyrodidae) on different varieties of cotton, gossypium hirsutum
نویسندگان
چکیده
abstract nymphal survival and crawlers movement of bemisia tabaci (homoptera: aleyrodidae) on different varieties of cotton, gossypium hirsutum, was studied on 5 different varieties including, varamin, kucker-312, bulgar-557, sahel-80, and native (red leaf/red boll) at 24±2 °c, 65±5% rh, 16:8 (l: d) photoperiod in the greenhouse condition. crawlers' movement was significantly different on the varieties. the highest average movement was 77.93±14.62% on the native variety, and the lowest one was 17.84±9.71% on bulgar-557. mean percentage of survival of the eggs on the native variety was lower than other varieties and significantly different; but it was not significantly different on other varieties and also their different leaf surfaces. study on the immature life stages from 1st instar to pupa indicated that mean percentage of survival of different life stages was significantly different on the varieties; so that the lowest one was on native, and the highest one was on bulgar-557 and sahel-80. of the different varieties, varamin was the only variety which the mean percentage of survival was different on adaxial and abaxial leaf surfaces, as it was determined 65.87±13.45 and 58.12±17.31 percent, respectively. mean percentage of mortality of different life stages including, 1st to 4th nymphal instars, prepupae, and pupae was separately studied on the adaxial leaf surface of native variety. the highest and the lowest mortality was occurred in first (between 1st and 2nd nymphal instars) and fifth (between prepupa and pupa) stadia, respectively. movement of crawlers from abaxial to adaxial leaf surface was not dependent on leaf orientation and photoperiod; therefore, phototropism and geotropism are not effective factors for sweetpotato crawlers’ movement, while other factors especially different characteristics of abaxial and adaxial leaf surfaces have the major role in this behavior.
منابع مشابه
Natural enemies of cotton whitefly bemisia tabaci gennadius homoptera aleyrodidae in fars province of iran
متن کامل
Location of Geminiviruses in the Whitefly Bemisia tabaci (Homoptera: Aleyrodidae)
W. B. Hunter, University of Florida, Gulf Coast Research and Education Center, 5007 60 St. E., Bradenton 342039324; E. Hiebert, University of Florida, Plant Pathology Department, 1453 Fifield Hall, Gainesville 32611-0680; S. E. Webb, University of Florida, Central Florida-REC, 5336 University Ave., Leesburg 34748-8232; J. H. Tsai, University of Florida, Ft. Lauderdale-REC, 3205 S.W. College Ave...
متن کاملECOLOGY AND BEHAVIOUR Bemisia tabaci (Homoptera: Aleyrodidae) Biotypes in India
Host plant performance, esterase, and virus transmission tests revealed cassava-strain and sweetpotato-strain populations of whiteßy Bemisia tabaci (Gennadius) biotypes in India. Individuals from the sweetpotato-reared population did not breed on cassava, Manihot esculenta Crantz, and the cassava-strain-reared individuals failed to develop on sweetpotato, Ipomoea batatus (L.) Lam. Eggplant, Sol...
متن کاملConservation of predatory arthropods in cotton: role of action thresholds for Bemisia tabaci (Homoptera: Aleyrodidae).
Studies were conducted in 1994 and 1995 to examine the effects of a range of action thresholds for managing Bemisia tabaci (Gennadius) Biotype B (= B. argentifolii Bellows & Perring) with insecticides in cotton on populations of arthropod predators in Imperial Valley, CA, and Maricopa, AZ. Application of insecticides significantly reduced population densities of spiders, Geocoris punctipes (Say...
متن کاملImproved Conservation of Natural Enemies with Selective Management Systems for Bemisia tabaci (Homoptera: Aleyrodidae) in Cotton*
A large-scale study was conducted in 1996 to evaluate and demonstrate strategies for pest management of Bemisia tabaci (Gennadius) in cotton involving different insecticide regimes, application methods, and action thresholds. Here we examined the effects of the various management systems on the abundance and activity of native natural enemies. Population densities of 18 out of 20 taxa of arthro...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
حفاظت گیاهانجلد ۲۳، شماره ۲، صفحات ۰-۰
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023