Quality control of the parasitoid wasp Trichogramma brassicae (Hymenoptera: Trichogrammatidae) over 45 generations of rearing on Sitotroga cerealella  

作　　者：Ehsan Ghaemmaghami Yaghoub Fathipour Abdoolnabi Bagheri Ali Asghar Talebi Gadi V.P.Reddy 

机构地区：[1]Department of Entomology,Faculty of Agriculture,Tarbiat Modares University,Tehran,Iran [2]Plant Protection Research Department,Hormozgan Agricultural and Natural Resources Research and Education Center,Agricultural Research Education and Extension Organization(AREEO),Bandar Abbas,Iran [3]USDA-ARS-Southern Insect Pest Management Research Unit,Stoneville,Mississippi,USA

出　　处：《Insect Science》2021年第1期180-190,共11页昆虫科学（英文版）

摘　　要：Trichogramma brassicae(Bezdenko)is an important biological control agent that has been used widely against many lepidopteran pests.Commonly,colonies of Trichogramma are mass reared on factitious hosts such as Sitotroga cerealella(Olivier)over many generations.In this study,we evaluated the quality and performance of a colony of T.brassicae that had been reared for over 45 generations(G)using two-sex life table parameters and parasitism capacity.We found that female adult longevity was significantly different among sequential generations,ranging from 5.58±2.5 d(at G5)to 3.75±1.42 d(at G45).However,no significant difference was found in male adult longevity among different generations.Although female wasps survived longer until the 15th gener・ation,they allocated more days for egg laying at G5 and GIO.The highest values of gross reproductive rate(GRR),net reproductive rate(7.),intrinsic rate of increase(r),finite rate of increase(λ)and mean generation time(T)were found in G5 and GIO,which also showed significantly higher cq.No significant difference in the finite parasitism rate(co)was found among generations up to G15.These results suggest that T.brassicae wasps held under continuous laboratory rearing can be used successfully in biological control programs until the 15th generation without any loss of quality or performance.However,laboratory mass rearing colonies declined in quality after 15 generations and we suggest that they should be rejuvenated regularly by adding field-collected parasitoids periodically.

关 键 词：biological control generation-dependent demography mass rearing parasitism rate Trichogramma brassicae 

分 类 号：S47[农业科学—农业昆虫与害虫防治]