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

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Relation http://oar.icrisat.org/6035/
http://dx.doi.org/10.1017/S0014479700001046
 
Title A weather-based scheme to advise on limited chemical control of groundnut leaf spot diseases in India
 
Creator Butler, D R
Wadia, K D R
Reddy, R K
Das, N D
Johnson, B
Kumari, M
Murty, K K
Sreenivas, B
Srivastava, N N
 
Subject Groundnut
Plant Virology
Entomology
 
Description 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
 
Publisher Cambridge University Press
 
Date 2000
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/6035/1/ExpAgric_36_4_469-478%20_2000.pdf
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