Virulence of Phytophthora isolates from Piper nigrum L. and their sensitivity to metalaxyl-mancozeb

  • K.B. Vinitha, M. Anandaraj and R. Suseela Bhai

Abstract

Foot rot disease caused by Phytophthora capsici in black pepper is the most destructive disease. A total of 82 isolates from the National Repository of Phytophthora at ICAR-Indian Institute of Spices Research were evaluated for their sensitivity to metalaxylmancozeb and also tested for their virulence. Of the 82 isolates studied, 19 (23.2%) were highly sensitive to metalaxyl-mancozeb and six (7.3%) were comparatively insensitive (EC90 value >40 ppm; range 41.3 to 68.5 ppm). The isolates also varied in the degree of virulence, viz., 34 (41.5%) were highly virulent, 39 (47.6%) moderately virulent, 4 (3.7%) mildly virulent, and 5 (6.1%) non-virulent. There was neither any significant correlation between sensitivity to metalaxyl-mancozeb and virulence nor with the geographical location. 

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How to Cite
R. Suseela Bhai, K. V. M. A. and. (2016). Virulence of Phytophthora isolates from Piper nigrum L. and their sensitivity to metalaxyl-mancozeb. Journal of Plantation Crops, 44(2). https://doi.org/https://doi.org/10.19071/jpc.2016.v44.i2.3100
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Research Articles