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Bio-efficacy of potassium phosphonate against nut rot disease of areca nut (Areca catechu L.) in the northern Karnataka of India

Author:

G. M. Hegde

University of Agricultural Sciences, Dharwad, Karnataka, IN
About G. M.
College of Forestry
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Abstract

Phytophthora arecaea, a causal agent of nut rot disease (koleroga) of areca nut (Areca catechu L.) is one of the major fungal pathogens affecting the crop in the northern Karnataka of India. The estimated loss associated with this disease extends up to 60%. In the endemic regions of India, the disease occurs immediately after the onset of the monsoon rains (June) and prevails till mid-August due to congenial weather conditions. For the effective management of this devastating disease, potassium phosphonate was tried during June and July 2013-2014 at the farmer’s fields. The results revealed that potassium phosphonate applied at the rate of 6.0 ml/L has reduced the per cent disease incidence (PDI) in areca nut (PDI=19.5%), where the results were on par (p>0.05) with metalaxy MZ applied at 2.0 g/L (PDI=16.81%) and Bordeaux mixture applied at 1% (w/v; PDI=18.84%). However, potassium phosphonate at 3.0 ml/L (PDI=43.10%) and 4.5 ml/L (PDI=39.45%) was not effective in reducing the PDI. The maximum PDI of 52.87% was recorded in unsprayed control plots. The highest yields of 26.42 q/h was recorded from the plots sprayed with metalaxy MZ at 2.0 g/L, which is in par (p>0.05) with potassium phosphonate applied at 6.0 ml/L (24.76 q/ha) and Bordeaux mixture at 1% (25.12q/ha). The lowest yield (12.48 q/ha) was recorded from the control (unsprayed) plots.
How to Cite: Hegde, G.M., (2015). Bio-efficacy of potassium phosphonate against nut rot disease of areca nut (Areca catechu L.) in the northern Karnataka of India. Sri Lanka Journal of Food and Agriculture. 1(2), pp.9–14. DOI: http://doi.org/10.4038/sljfa.v1i2.14
Published on 12 Sep 2015.
Peer Reviewed

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