Pod rot of cowpea and its management using fungicides

Publication Date : 30/05/2015


Author(s) :

Milsha George , V.K.Girija.


Volume/Issue :
Volume 1
,
Issue 5
(05 - 2015)



Abstract :

Wet rot disease of cowpea pods were found in the seed production plots of vegetable cowpea (Vigna unguiculata subsp. sesquipedalis (L.) Verdcourt), at College of Agriculture, Vellayani, Kerala during October – November 2014. The mature pods exhibited symptoms like water soaking, wet rotting and shrivelling of pods. The disease was more severe during the hot and high humid conditions. Under high humid conditions, the pods were covered with white cottony mycelial growth of the pathogen with heavy fructifications. The pathogen causing the pod rot of cowpea was isolated from the diseased pods and based on cultural and morphological characters, the pathogen was identified as the Choanephora cucurbitarum (Berk. & Ravenel) Thaxt. Pathogenicity was proven by artificial inoculation of the pathogen on fresh pods and symptoms such as water soaking and wet rotting developed within 24 h. Nine fungicides such as mancozeb, copper hydroxide, copper oxy chloride, azoxystrobin, carbendazim, carboxin, propiconazole, captan + hexaconzole and carbendazim + mancozeb at three concentrations i.e., lower than recommended dose, recommended dose and higher than recommended were tested to evaluate the efficacy to inhibit the growth of C.cucurbitarum under in vitro conditions. Results showed that two contact fungicides mancozeb and copper oxy chloride, two systemic fungicides propiconazole and carboxin at three concentrations gave 100% inhibition of the pathogen, whereas, the two combination fungicides at recommended and higher dose gave complete suppression of the pathogen.


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