Identification of resistant sources and epidemiology of early blight (Alternaria solani) of tomato (Lycopersicum esculentum) in Jammu and Kashmir


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Authors

  • SUNITA RANI, RANBIR SINGH, SACHIN GUPTA* SIDDARTH DUBEY and V.K. RAZDAN

Keywords:

Alternaria solani, early blight, resistance, screening, tomato

Abstract

Field surveys were conducted during 2011 and 2012 to diagnose the symptoms of early blight disease (Alternaria solani) of tomato (Lycopersicum esculentum L.) in all vegetable-growing areas of Jammu Division of Jammu and Kashmir. The disease intensity and incidence varied from 21.66 to 34.13% and 10.48 to 18.56%, respectively. Progression of early blight disease in 15 genotypes of tomato in relation to different resistant components, viz. size of spot, disease index was studied under field and artificial conditions. Area under disease progress curve (AUDPC) calculated for field studies showed maximum AUDPC of 582.55 exhibited by Pusa Ruby. Three varieties, viz. CO3, Tomato Cherry and Heem Sohna were found moderately resistant, while Pusa Ruby, P-2 and Indam Vaishali were found susceptible under both field and artificial conditions. Maximum lesion size (11.33 mm) was recorded in Pusa Ruby and minimum (4.3 mm) in CO3 under artificial conditions. Weather factors (temperature, humidity and rainfall) were found to play a significant role in the development of early blight of tomato. Disease showed a progressive increase and maximum disease intensity was observed during 21st standard week in Pusa Ruby and minimum severity (12.42%) in CO3 during the same week. The disease intensity exhibited significant and positive simple correlation with minimum and maximum temperature and significant and negative correlation with maximum relative humidity. However, rainfall and minimum relative humidity showed non-significant positive and negative correlation, respectively. Step-wise regression equation was drawn for disease prediction.

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Issue

Vol. 68 No. 1 (2015): Indian Phytopathology

Section

Research Articles

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How to Cite

SIDDARTH DUBEY and V.K. RAZDAN, S. R. R. S. S. G. (2015). Identification of resistant sources and epidemiology of early blight (Alternaria solani) of tomato (Lycopersicum esculentum) in Jammu and Kashmir. Indian Phytopathology, 68(1), 87-92. https://epubs.icar.org.in/index.php/IPPJ/article/view/46980