P. Varma Kishore ¹, S. K. Gandhi ², Surender Singh ²

Affiliations
1 Agricultural Research station, Tandur- 501141, Ranga Reddy (Dt), Andhra Pradesh, IN
2 CCS Haryana Agricultural University, Hisar- 125004, Haryana, IN

Abstract

Plant extracts and saprophytic fungi isolated from tomato phylloplane were evaluated against Alternaria solani, the causal agent of early blight of tomato, under screen house and field conditions. Foliar spray of Clerodendron leaf extract (15%) immediately after appearance of symptoms or foliar spray of Trichoderma viride (10⁷ CFUs ml⁻¹) 24h before challenge inoculation with the test fungus was found effective In reducing the disease severity under screen house conditions. Under field studies, effective control of the disease was recorded with three sprays of mancozeb (2000ppm). However, disease severity could be significantly reduced with initial spray of Clerodendron leaf extract (15%) or T. viride (107 CFUs ml⁻¹) followed by two sprays of mancozeb.

Keywords

Alternaria solani, Antagonist, Clerodendron, Plant Extract, Trichoderma viride.

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