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Biological control of Maize Stem Borer, (Chilo partellus) in Koshi region of Bihar

Poonam Kumaria, Arun Kumara* & Dinesh Yadavb
aP.G.. Department of Zoology, B. N. Mandal University, Madhepura, Bihar, India
bDepartment of Zoology, T.P.College, B. N. Mandal University, Madhepura, Bihar, India
Received : 28th April, 2020 ; Revised : 29th May, 2020

Abstract Maize stem borer damage varied from 10 to 30% in the state of Bihar. Most of the borer damage occurred when the crop was in early vegetative stage and by the time it reached tasseling, no further increase in damage was observed. The activity of adult moths started after the middle of March and continued to increase until the middle of May after which a decline in population was observed in June. This synchronizes with the infestation pattern observed for the spring maize. Trichogramma activity was first observed after the middle of July after which parasitism ranged from 14 to 40%. The samples collected from April to June did not indicate the presence of Trichogramma. Identification of Trichogramma species associated with maize stem borer indicated the presence of only Trichogramma chilonis. Preliminary studies conducted to evaluate the impact of Trichogramma releases showed its success in reducing the damage caused by maize stem borer.

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