Impact of weather on the occurrence pattern of insect pests on groundnut

DOI: 10.5958/0976-0571.2015.00108.3    | Article Id: LR-3022 | Page : 524-535
Citation :- Impact of weather on the occurrence pattern of insect pests on groundnut.Legume Research-An International Journal.2015.(38):524-535
G. Harish, M.V. Nataraja, Poonam Jasrotia, Prasanna Holajjer, S.D. Savaliya and Meera Gajera hari4065@gmail.com
Address : Directorate of Groundnut Research, P. B. No. 5, Junagadh-362 001, Gujarat, India.

Abstract

The study was carried out to know the impact of weather on the occurrence pattern of insect pests of groundnut. The population of Spodoptera litura (Fabricius) reached its maximum (30.5 moths/trap) at 40th standard week, whereas Helicoverpa armigera (Hubner) peaked at 46th standard week (5.5 moths/trap). Maximum number of leafhoppers (78.5 adults/5 sweeps) and thrips (22.5 adults/5 sweeps) were recorded at the end of 8th and 4th standard weeks, respectively. Both the maximum temperature (0C) and sunshine (h) were found to show direct relationship with the populations of S. litura, H. armigera, leafhopper and thrips during kharif season. Multiple regressions analysis indicated that the population of S. litura and leafhopper with different weather parameters had a significant interaction during kharif whereas; population of leafhopper and thrips had a significant interaction with different weather parameters during summer.

Keywords

Arachis hypogaea Correlation Helicoverpa armigera Leafhoppers Regression Seasonal incidence Spodoptera litura Thrips.

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