A weather-based scheme to advise on limited chemical control of groundnut leaf spot diseases in India

Butler, D R and Wadia, K D R and Reddy, R K and Das, N D and Johnson, B and Kumari, M and Murty, K K and Sreenivas, B and Srivastava, N N (2000) A weather-based scheme to advise on limited chemical control of groundnut leaf spot diseases in India. Experimental Agriculture, 36 (4). pp. 469-478. ISSN 0014-4797

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Abstract

Infection of groundnuts by pathogens causing early and late leaf spot diseases (Cercospora arachidicola [Mycosphaerella arachidis] and Phaeoisariopsis personata [M. berkeleyi], respectively) is strongly affected by accumulated daily leaf wetness periods and, in the rainy season, temperature is unlikely to severely limit infection. Earlier work relating patterns of leaf wetness to infection, was used to define a daily Wetness Index (WI) which was compared with infection on inoculated plants exposed in the crop for periods of 7 d. Infection was only severe when the 7-d WI total exceeded a value of 2.3. The proportion of leaves with one or more lesions on the main stem was used to assess the amount of inoculum in the crop. When the proportion of diseased leaves exceeded 10% and the WI total exceeded the threshold, application of a fungicide was advised. Successive sprays were separated by at least 14 d and a maximum of three sprays were applied in the growing season. Field trials showed that three sprays gave limited benefit where the disease pressure was severe, but substantial increases in pod and haulm yield were possible with only one or two fungicide applications in locations with less disease pressure

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Subjects:	Mandate crops > Groundnut Others > Plant Virology Others > Entomology
Depositing User:	Mr B K Murthy
Date Deposited:	06 Jul 2012 10:19
Last Modified:	06 Jul 2012 10:19
URI:	http://oar.icrisat.org/id/eprint/6035
Official URL:	http://dx.doi.org/10.1017/S0014479700001046
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Author

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