bionomics of aphis gossypii (homoptera: aphididae) and its predators coccinella septempunctata and hippodamia variegata (coleoptera: coccinellidae) in natural conditions
نویسندگان
چکیده
bionomics of aphis gossypii glover and its predators coccinella septempunctata l. and hippodamia variegata goeze were studied in varamin (tehran province) during 11th may to 5th october 2006 on eggplant crop, with the interaction (density dependence) between the aphid and either of the predators determined. the reliable sample size (number of leaves) with a maximum variation of 6.73% was about 56. the index of dispersion, regression models (taylor and iwao), morisita’s index as well as lloyd’s mean crowding to mean were employed to estimate the spatial distribution pattern of the insects. the results indicated that the highest population densities of a. gossypii, c. septempunctata and h. variegata occurred in 8th june (11.62 per leaf), 17th august (0.36 per leaf) and 3rd august (2.11 per leaf), respectively. the index of dispersion, regression models (taylor and iwao), morisita’s index and lloyd’s mean crowding to mean showed aggregated distribution for all species. the linear regression model between prey and predators’ population densities showed a density independent predation by c. septempunctata and h. variegata on a. gossypii. this study indicated that spatial distribution parameters of the cotton aphid and its natural enemies can be employed to outline a sampling program and to estimate the population densities of these insects for use in integrated pest management programs.
منابع مشابه
Predation rate of Hippodamia variegata (Coleoptera: Coccinellidae) feeding on different densities of Aphis gossypii (Hemiptera: Aphididae)
نرخ شکارگری اساس هر پژوهش در برهمکنش شکار-شکارگر است و یکی از اجزای مهم در انتخاب شکارگران در کنترل بیولوژیک بهشمار میرود. نرخ شکارگری کفشدوزکHippodamia variegata (Goeze) با تغذیه از تراکمهای مختلف (20، 40، 60، 80 و 100) عدد از پورههای سن سوم شته پنبه Aphis gossypii Glover در شرایط آزمایشگاهی (1±25 درجه سلسیوس، رطوبت نسبی 5 ±65 درصد و دوره نوری 16 ساعت روشنایی و 8 ساعت تاریکی) بررسی شد. ...
متن کاملFunctional response of larval and adult stages of Hippodamia variegata (Coleoptera: Coccinellidae) to different densities of Aphis fabae (Hemiptera: Aphididae).
We compare the efficiencies of different stages of Hippodamia variegata (Coleoptera: Coccinellidae) preying on Aphis fabae (Scolpoli) (Hemiptera: Aphididae) by estimating the functional responses of all stages. The experiments were carried out on leaf disks in petri dishes with 15-20 replicates. Our results revealed that all larval instars and adult males and females of H. variegata exhibited t...
متن کاملpredation rate of hippodamia variegata (coleoptera: coccinellidae) feeding on different densities of aphis gossypii (hemiptera: aphididae)
predation rate is basic to any investigation of prey-predator interaction and a major component in the selection of predators for biological control. the predation rate of variegated lady beetle, hippodamia variegata (goze), fed on different densities (20, 40, 60, 80 and 100) of third instar nymphs of cotton aphid, aphis gossypii glover, was studied under laboratory conditions (25 ± 1 °c, 65 ± ...
متن کاملAphid Species Affect Foraging Behavior of Coccinella septempunctata (Coccinellidae: Coleoptera).
BACKGROUND Flowers are admirable in scenic good looks and artistic beautification. These are also playing necessary roles in therapeutic preparations. Aphid is an important sucking pest of various flowers in ornamental territories and it is generally controlled by predators, so it was necessary to evaluate which aphid species affect the predator more or less. MATERIALS AND METHODS Biocontrol ...
متن کاملPakistan Entomologist REARING OF COCCINELLA SEPTEMPUNCTATA L. (COLEOPTERA: COCCINELLIDAE) ON NATURAL AND ARTIFICIAL DIETS
Different types of pests are found in nature affecting life and yield of natural and cultivated crops of agro-forestry. Researchers are trying to develop and apply different techniques to control and reduce loss of these pests on agriculture, forest and garden products. Chemical control method (CCM) is frequently applied as it is easy and prompt way to directly kill or repel the pests from crop...
متن کاملمقایسهی پارامترهای رشد جمعیت کفشدوزک Coccinella septempunctata (Col.: Coccinellidae) و شتهی جالیز، Aphis gossypii (Hem.: Aphididae)، در شرایط آزمایشگاهی
حشرات کامل کفشدوزک هفتنقطهای، Coccinella septempunctata L.، و شتهی جالیز، Aphis gossypii Glover، از مزارع خیار اطراف رشت جمعآوری شدند و در اتاقک رشد در دمای C2 26 و دورهی نوری 8 :16 ساعت (تاریکی: روشنایی) و رطوبت نسبی 5 65% پرورش داده شدند. ده جفت کفشدوزک در حال جفتگیری که 48 ساعت از ظهورشان گذشته بود، بهطور جداگانه به ظروف پلاستیکی شفاف به ابعاد 12 × 10 × 8 سانتیمتر که درپوش آنها...
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عنوان ژورنال:
journal of agricultural science and technologyناشر: tarbiat modares university
ISSN 1680-7073
دوره 12
شماره Number 1 2010
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