N. Chandramohan ¹

Affiliations
1 Department of Sericulture, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641003, IN

Abstract

In Nilgiris, the larval population of diamond backmoth Plutella xylostella L. in cabbage was more from December to May with its peak activity during April. Diadegma semiclausm (Horstmann) and Cotesia plutellae (Kurdjumov) are widely established larval parasitoids. Activity of D.semiclasm was more during September. Level of parasitism by D.semiclausm was not influenced much by weather elements and host density. The parasitism by C. plutellae was more in hot-weather period and parasitoid activity was influenced by host density. Maximum temperature, and morning relative humidity had positive influence whereas, evening relative humidity had negative influence on C. plutellae p

Keywords

Diamondhack Moth, Diadegma semiclausm, Cotesia plutellae, Seasonal Incidence

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N. Chandramohan ¹, S. Chelliah ¹

Affiliations
1 Centre for Plant Protection Studies, Tamil Nadu G.D.Naidu Agrl. University, Coimbatore-641 003, IN

Abstract

Egg parasitoids were more predominant than those attacking other developmental stages of yellow stemborer Scirpophaga incertulas (W). Activity of Tetrastichus schoenobii was negatively Influenced by maximum temperature and wind velocity. Weather clements had little Influence on the activity of Telenomus.

Keywords

Yellow Stemborer, Tetrastichus, Telenomus.

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