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Comparative life table of Aphis craccivora (Hem.: Aphididae) on host plant, Robinia pseudoacacia under natural and laboratory conditions

Sahragard، Ahad نويسنده Faculty of Agricultural Sciences,Department of Plant Protection,Guilan University,ايران Jalalipour, R. , Jalalipour، Reza نويسنده Guilan University,ايران Sahragard, A. , Madahi، Khadijeh نويسنده Guilan University,ايران Madahi, Kh. , Karimi-Malati، Azadeh نويسنده Guilan University,ايران Karimi-Malati, A.

فصلنامه سال 1395 شماره 67

علمي پژوهشي

9

249

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APHIS CRACCIVORA , Intrinsic Rate of Increase , generation time , life table parameters , natural condition

The cowpea aphid, Aphis craccivora Koch, is an important pest of Robinia pseudoacacia Frisia. Life table parameters of A. craccivora were determined under natural (16 33ºC and 3289% RH, respectively) and laboratory (25 ± 1ºC, RH of 70 ± 5% and a photoperiod of 16:8 h (L: D) conditions. The data were analyzed using the agestage, twosex life table theory. Each experiment was replicated 45 times for each condition. There was significant differences between the survivorship, fecundity and longevity of the A. craccivora in laboratory and natural conditions. Under natural conditions, A. craccivora had a significant shorter nymphal developmental time, adult longevity and life span than those reared under laboratory conditions. However, the intrinsic rate of increase (r), net reproductive rate (R0), the finite rate of increase (λ) and gross reproductive rate (GRR) under laboratory conditions, were higher than those obtained in field, the higher mean generation time (T) was found in the field. All in all, the results of this study showed that two different conditions (field and laboratory) had significant influence on developmental times and life table parameters of A. craccivora and it is hard to escape the obvious conclusion that we must prevent the unsuitable extrapolation of laboratory results to field applications. The results obtained here, could also help us to understand the population dynamics of A. craccivora under field condition and to develop effective integrated pest management (IPM) programs.

1395

نامه انجمن حشره شناسي ايران

نامه انجمن حشره شناسي ايران

فصلنامه با شماره پیاپی 67 سال 1395

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