Dynamics of Diaeretiella rapae (M’Intosh) (Braconidae: Aphidiidae) and its Hyper Parasitoid on Mustard Aphid, Lipaphis erysimi Kalt Infesting Brown Mustard, Brassica campestris Linn. in Kashmir, India


Affiliations

  • SKUAST-K, Division of Entomology, Srinagar, J&K, India

Abstract

The dynamics of Diaeretiella rapae L. and its hyper parasitoid on mustard aphid, Lipaphis erysimi Kalt. infesting brown mustard, Brassica campestris L. was studied. Average mustard plant infestation by L. erysimi, and its density were 13.07 and 16.0 per cent 121.3 and 161.75 per plant, respectively, during 2007 and 2008. A positive correlation was observed between aphid density and plant infestation. Rise in aphid density was positively and negatively correlated with maximum temperature and relative humidity, respectively. Maximum parasitism by D. rapae was 21.6 and 34.7 per cent during 2007 and 2008, respectively. The parasitism was totally aphid density dependent. Average hyper parasitism in D. rapae by Pachyneuron aphidis (Bouche) was 2.52 and 5.07 per cent during corresponding years, and showed insignificant impact on parasitism as well as aphid density.

Keywords

Brassica campestris, Diaeretiella rapae, Kashmir, Lipaphis erysimi, Pachyneuron aphidis.

Subject Discipline

Entomology

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