Management of Early Blight of Tomato (Alternaria solani) through Application of Plant Extracts and Fungicides
Sunita Choudhary *
Department of Plant Pathology, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior – 474002, (M.P.), India.
Rajani Singh Sasode
Department of Plant Pathology, Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya, Gwalior – 474002, (M.P.), India.
Pinki Devi Yadav
Department of Plant Pathology, Sri Karan Narendra Agriculture University, Jobner- 303328, (Rajasthan), India.
Ranjana Meena
Department of Plant Pathology, Sri Karan Narendra Agriculture University, Jobner- 303328, (Rajasthan), India.
Pooja Yadav
Department of Plant Pathology, Sri Karan Narendra Agriculture University, Jobner- 303328, (Rajasthan), India.
*Author to whom correspondence should be addressed.
Abstract
In the present work, plant extracts and fungicides were evaluated for an effective management of early blight of tomato caused by Alternaria solani under in vitro and in vivo condition and determine yield losses and cost benefit ratio. The present investigations revealed that Hexaconazole and Azoxystrobin were most effective it produced 100.0 per cent mycelia growth inhibition, whereas minimum mycelia growth was recorded in Difenoconazole (1.89 mm) and Trifloxystrobin + Tebuconazole (4.0 mm). Calotropis gigantea extract @ 20 per cent was found best as it produced 77.0 per cent mycelia growth inhibition of Alternaria solani followed by Azadirachta indica (74.26%).The effect of foliar spray of Calotropis gigantea @ 20.0 per cent was found the best for managing early blight of tomato in field condition as minimum disease intensity (39.83%) and highest yield (15.25 t/ha) was recorded with highest benefit cost ratio (1.62). The minimum disease intensity (15.43%), highest yield (22.40 t/ha) and highest benefit cost ratio (2.75) was recorded in Hexaconazole @ 0.1 per cent followed by Azoxystrobin @ 0.1 per cent.
Keywords: Early blight, Tomato, Fungicide, Plant extract