Management of Corynespora Leaf Fall Disease of Rubber in the Nursery
Corynespora leaf fall (CLF) caused by Corynespora cassiicola (Berk & Curt) Wei is one of the most important diseases of Hevea worldwide that threatens many rubber plantations and can kill the tree and reduce its full yield potential.
The study evaluated the best management options against CLF disease of rubber caused by Corynespora cassiicola causing synthetic and biofungicides both in vitro and in vivo. Fungicides tested in vivo were those found effective to very effective in vitro and five synthetic fungicides (Propineb, Chlorothalonil, Copper hydroxide, Manganese copper zinc and Bromate) and three biofungicides (AZ41, EM and LABS) exerted effective to very effective fungicidal action against the test pathogen in vitro.These eight fungicides were tested in vivo in randomized complete block design both in effective and eradicative set-ups. All treatments were rated very effective protectant/eradicant against C. cassiicola due to earlier flushing of new leaves after the leaf fall compared to the untreated control (from 21 to 29 days in both set ups), lower degree of infection from 1.56% to 4.69% (protective) and 6.25% to 15.63% (eradicative) and higher degree of control from 92.51% to 98.08% (protective) and 82.47 to 87.96% (eradicative) of the disease was observed. The highest percentage of disease reduction of CLF after four cycles of spray application at weekly interval was obtained with Chlorothalonil, Bromate and LABS from 79.67 to 82.29%, comparable to the effect of the two checks (manganese copper zinc and AZ41).Three synthetic fungicides (Propineb, Chlorothalonil and Copper hydroxide) and one biofungicide (LABS) were found the most cost effective in controlling CLF disease of rubber seedlings in the nursery.
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