Effects of leaf wetness and temperature on late leaf-spot infection of groundnut

Butler, D R and Wadia, K D R and Jadhav, D R (1994) Effects of leaf wetness and temperature on late leaf-spot infection of groundnut. Plant Pathology, 43 (1). pp. 112-120. ISSN 1365-3059

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Experiments are described to quantify the effects of temperature and leaf wetness duration on infection of groundnut by Phaeoisariopsis personata. Temperature response curves for conidial germination and infection were similar, with optima close to 20°C and minimum and maximum temperatures of about 8°C and 34 C, respectively. The effect of temperature on infection between 15°C and 26°C was slight. Lesions developed only if the leaf wetness period exceeded about 20 h, and the total wetness period necessary for maximum infection exceeded 160 h. The number of lesions resulting from a fixed amount of inoculum was several times greater if leaves were exposed to alternate wet and dry periods (intermittent wetness), compared with continuous wetness. With intermittent wetness the length of the dry period had little effect on the number of lesions, providing it exceeded 2 h. The response curve relating total wetness periods to lesion density was an exponential asymptote.

Item Type: Article
Subjects: Mandate crops > Groundnut
Depositing User: Library ICRISAT
Date Deposited: 13 Dec 2011 08:49
Last Modified: 13 Dec 2011 08:49
URI: http://oar.icrisat.org/id/eprint/4823
Official URL: http://dx.doi.org/10.1111/j.1365-3059.1994.tb00560...
Acknowledgement: UNSPECIFIED
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