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( Miltan Chandra Roy ),( Shabbir Ahmed ),( Md. Mahi Imam Mollah ),( Yonggyun Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.4
The beet armyworm, Spodoptera exigua, is a serious insect pest infesting various vegetable crops. Two infectious insect viruses, baculovirus and iflavirus, are known to induce epizootics in S. exigua populations. Indeed, some laboratory colonies have appeared to be covertly infected by these viruses. Diagnostic PCR tests detected two different viruses: Spodoptera exigua multiple nucleopolyhedrosis virus (SeMNPV) and iflaviruses (SeIfV1 and SeIfV2). Viral extract from dead larvae of S. exigua could infect Sf9 cells and produce occlusion bodies (OBs). Feeding OBs to asymptomatic larvae of S. exigua caused significant viral disease. Interestingly, both SeIfV1 and SeIfV2 increased their titers at late larval stages. Sterilization of laid eggs with 1% sodium hypochloride significantly reduced SeMNPV titers and increased larval survival rate. Doublestranded RNA (dsRNA) specific to SeIfV1 or SeIfV2 significantly reduced viral titers and increased larval survival rate. To continuously feed dsRNA, a recombinant Escherichia coli HT115 expressing SeIfV1-dsRNA was constructed with an L4440 expression vector. Adding this recombinant E. coli to the artificial diet significantly reduced the SeIfV1 titer and increased larval survival. These results indicate that laboratory colony collapse of S. exigua is induced by multiple viral infections. In addition, either suppression of SeMNPV or SeIfV infection significantly increased larval survival, suggesting a cooperative pathogenicity between baculovirus and iflavirus against S. exigua.
Md Ruhul Amin,Miltan Chandra ROY,Md Mahbubar RAHMAN,Md Giashuddin MIAH,권용정,서상재 한국곤충학회 2015 Entomological Research Vol.45 No.6
This study investigated the morphological and biochemical characteristics of the CB1, CB3, CB5, CB8 and CB12 cotton varieties and evaluated their effects on third instar larval movement, and body weight of the cotton armyworm Spodoptera litura at different developmental stages. The cotton varieties differed in their plant architecture, branching, stem color and hairiness, leaf color and hairiness, leaf trichome density, flower color, numbers of leaves and bolls per plant, concentrations of protein and starch, and boll length, width and weight. The CB1 and CB3 varieties possessed significantly higher trichome densities, while CB8 produced larger and heavier bolls. Boll bearing was found to be highest in CB1 and lowest in CB8. Biochemical analyses indicated the highest percentage of protein in CB5, and of starch in CB8; concentrations of both were lowest in CB12. Cotton varieties did not affect larval foraging, but their abundance on leaflet, mature and square differed significantly. Analysis of the growth response parameters of S. litura as a result of feeding on the tested varieties revealed that larval instars, pupae and adult moths attained the highest body weight on CB8, followed by CB5, and the lowest weight on CB12. Collectively, the results of this study show that the CB5 and CB8 varieties are favorable host‐plants for cotton armyworms; therefore, these varieties are the least suitable for cultivation.