Anil Kumar ¹, R. K. Walia ¹, Ashima Kapoor ¹

Affiliations
1 Department of Nematology, CCS Haryana Agricultural University, Hisar, 125 004, Haryana, IN

Abstract

The bacterial parasite, Pasteuria penetrans (ex Thorne) Sayre & Starr was tested as seed treatment against Meloidogyne javanica (Treub) Chitwood in okra-cowpea-chickpea sequence. In the first crop of okra, yield increase was not significant, but 21 per cent of the juvenile population at the end of the crop carried bacterial infection to the second crop. Yield differences became evident from the second crop of cowpea, which also left 46.5 per cent less juvenile population and the incidence of bacterium increased to 29 per cent. In the third crop of chickpea, besides 52.6 per cent increase in yield, a population reduction of 57.7 per cent was recorded, 50 per cent of which carried bacterial infection.

Keywords

Chickpea, Cowpea, Okra, Pasteuria penetrans, Seed Treatment.

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A. K. Sood ¹, O. P. Bhalla ¹, K. C. Sharma ¹, Anil Kumar ¹

Affiliations
1 Department of Entomology, Dr. Y. S. P. University of Horticulture and Forestry, Nauni, Solan 173230, H.P., IN

Abstract

Studies conducted on the natural enemies of Pieris brassicae (Linnaeus) in the mid-hill region of Himachal Pradesh, revealed that mortality caused by hymenopteran parasitoids,  Cotesia glomeratus (Linnaeus) and Hypersota ebeninus Gravenhorst ranged between 3.9-23.6% with its peak during mid April, while the mortality due to bacterial pathogens viz., Bacillus sp. and Serratia marcescens Bizio varied between 1.2-23.7%. Predators like Episyrphus balteatus (de Geer), Coccinella septempunctata Linnaeus and Polistes hebreus (Fabricius) though active, their role in suppressing the population of P. brassicac was negligible. The role of meteorological factors in the dynamics of natural enemies is also discussed.

Keywords

Abiotic Factor, Parasitoids, Pathogens, Pieris brassicae, Predators, Seasonal Activity.

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