Bitter rot disease of grape: symptomatology, inoculation, survival of the causal organism [Melanconium fuligineum] and chemical control [Azinmag, Daconil, Delsene, Derosal, Topsin-M]
1982
Kanoengnuch Pimubol
A study on bitter rot disease of "White Malaga" grape (Vitis vinifera L.) in Amphoe Sampran, Nakhon Pathom Province indicated that this disease is caused by a fungus, Melanconium fuligineum (Scrib and Viala) Cav. Disease symptoms of grape bitter rot were noticed by a V-shaped leaf blight, dead canes and mummified berries. Black tiny fruiting bodies (acervuli) were usually observed on the old infected tissues. Spores and mycelium of M. fuligineum could easily infect the host through wounds on leaves, twigs and berries. Effects of 5 fungicides at 5 concentration levels (10, 25, 50, 100 and 500 ppm) on growth, sporulation and spore germination of Melanconium fuligineum were evaluated. Azinmag inhibited spore germination but did not inhibit growth and sporulation. Daconil was effective against growth and spore germination. Derosal 60 showed a slight inhibition of spore germination. Topsin-M and Delsene MX at all levels of concentrations were effective in all 3 sets of experiments. Efficacy of the 5 fungicides tested during the rainy season in a vineyard indicated that Topsin-M when sprayed after pruning off the infected canes practice gave more effective control of bitter rot disease than the other 4 fungicides
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