G Chitti Babu
Acharya NG Ranga Agricultural University, India
Chitti Babu Giddi has completed his M.Sc (Ag) with specialization in Agricultural Entomology in 2008 at Acharya N G Ranga Agricultural University. While pursuing Docotoral got selected in the post of Assistant Professor in ANGRAU. Presently he is working as Scientist (Crop Protection) at Distrcit Agricultural Advisory and Trnasfer of Technology Centre (DAATTC) which is an extension wing of ANGRAU.
The ever increasing demand for large numbers of laboratory reared insects for bioassays has necessitated the development of efficient and economical methods for mass production of insect pests. Several methods have been developed for artificial rearing of cotton bollworm/legume pod borer, Helicoverpa armigera. However, it is difficult to maintain the culture of this insect in the laboratory for more than five generations because of onset of pathogen infection, and inbreeding depression resulting in reduce fecundity and egg hatching. Therefore, the present studies were planned to overcome the problems faced in maintaining the culture of H. armigera on a long-term basis under laboratory conditions. We evaluate plastic cups, glass vials, and cell well plates for maintaining the culture of this insect. The larval survival was significantly greater in insects reared individually in cellwells (95.33%), followed by glass vials (79.33 %), and poor in plastic cups and Petri plates where the insects were reared in groups. The weights of the larvae were also more in insects reared in cell wells, although the differences between different methods were not significant. The indigenously available cell well plates were quite suitable for rearing H. armigera, and these are amenable to surface sterilization, reusable, and hence, suitable for mass rearing of H. armigera.