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Short Communication

Seasonal Dynamics of Wheat Aphid and Predator Menochilus sexmaculata in Relation to Biotic and Abiotic Factors

S. R.GHORTALE1, Y. S. SAINDANE2, B. V. DEORE3 AND R. V. PATIL4

Department of Agricultural Entomology, Mahatma Phule Krishi Vidyapeeth, Rahuri, Maharashtra

Corresponding Author's Email: patilrupesh.2011@rediffmail.com

Abstract

The field experiments were conducted to evaluate the efficacy of different entomopathogenic fungi against wheat aphid (Rhopalosiphum padi L.) and seasonal incidence of wheat aphid during Rabi 2014 at the experimental farm of Department of Entomology, PGI, MPKV, Rahuri. Aphid species Rhopalosiphum padi (L.) was found prominent on wheat. Wheat aphid was noticed from December, 2014 to February, 2015. The maximum population of wheat aphid was recorded in the month of January and reached the peak in the 2nd week of January (63 aphids/ tiller) there after declined. The incidence of aphid disappeared from the 1st week of March i.e. 9th MW. Aphid infestation showed highly significant negative correlation with minimum temperature and non significant positive correlation with morning and evening humidity. The activity of coocinellides was noticed from January to February coinciding with aphid population on the crop. It ranged from 1.2 coccinellids/tiller in 1st week of December (52 MW) to 3.7 coccinellids/tiller in the 2nd week of January i.e. (2nd MW). Coccinellids showed highly significantly negative correlation with minimum temperature and highly significant positive correlation with aphids.

Keywords: Aphid, coccinellid.

Page No.: 11269-11271

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