NATURAL AND LABORATORY PARASITIZATION OF DIAERETIELLA RAPAE (M' INTOSH) (HYMENOPTERA : BRACONffiAE) - A PARASITOID OF LIPAPHIS ERYSIMI (KALT) (HOMOPTERA : APHIDIDAE)

摘要

The present study was carried out for estimation of natural and laboratory parasitization of Diaeretiella rapae iM' intosh) on Lipaphis erysime (Kalt) on mustard, Brassica compestris (Linn.) at district Muzaffarnagar in U.P. Study of parasitization were carried out during the year 2002-03,2003-04 and 2004-05, respectively. The parasitization percentage due to D. rapae in field was maximum 40.82% on 2 March 2003,34.30% on 19th Feb. 2004 and 44.09 on 6th March 2005. The average parasitization percentage in laboratory was 86.8%, 80.8% and 84.00% during the year 2003, 2004 and 2005, respectively..