Possible methods to minimise losses due to vascular streak dieback
1986
Jayawardena, M.P.G.S. | Elanjaran Mohan | Mohammad Musa Mohd Jamil
Currently, the most widely adopted method to control vascular streak dieback (VSD) in mature cocoa is to remove infected branches 30 cm beyond the point of visible streaking, but efficient removal of these infected branches was most often not possible or practical. Two other possible methods were studied to minimise the yield loss due to VSD, Multiple-stemmed trees and Bud grafting with bud patches from trees apparently tolerant to VSD. The first method comprised four treatments each with different number and age of chupons and a control. The yield pattern remained same in all the five treatments, but the mean cumulative number of pods per tree per year was higher than the control for three of the treatments by between 20 and 46%. In the second method infected mature trees in three blocks were grafted with bud patches obtained from trees free of VSD symptoms in fields with high VSD incidence. Yields in these rehabilitated blocks had increased by 25.30 to 63.44% and the percentage VSD infected branches/trees had reduced
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