N. Mathivanan ¹, K. Srinivasan ¹, S. Chelliah ¹

Affiliations
1 Nagarjuna Agricultural Research and Development Institute CIS, Vikrampuri, Secunderabad 500 009, Andhra Pradesh, IN

Abstract

Two biocontrol agents viz., Trichoderma viride Pseudomonas fluorescens Migula were evaluated against foliar diseases of groundnut and sunflower. Their efficacy was compared with that of commonly used fungicides. The results revealed that T. viride was equally effective as that of fungicides in controlling early and late leafspots and rust in groundnut, and Alternaria blight in sunflower in both the crops. Pseudomonas fluorescens was ineffective.

Keywords

Biological Control, Foliar Diseases, Groundnut, Pseudomonas fluorescens, Sunflower, Trichoderma viride.

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N. Mathivanan ¹, K. Srinivasan ¹, S. Chelliah ¹

Affiliations
1 Nagatjuna Agricultural Research and Development Institute C-15, Vikrampuri, Secunderabad 500009, Andhra Pradesh, IN

Abstract

Four locally available organic materials viz., farm yard manure, rice bran, saw dust and wheat bran were evaluated for their suitability as a carrier for a talc based formulation of Trichoderma viride . Mixtures of T. viride and these carriers were applied in soil to control ischolar_main diseases of sunflower. The results revealed that saw dust + T .viride mixture significantly reduced plant mortality caused by ischolar_main pathogens with commensurate increase of achene yield in sunflower.

Keywords

Biocontrol, Organic Materials, Root Diseases, Sunflower, Trichoderma viride.

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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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