Development of integrated disease management against vascular streak dieback of cacao. 1: chemical control of VSD using triadimenol at different dosages and method of application
1990
Tandingan, I.C. | Ampo, A.E. (Southern Mindanao Univ., Kabacan, Cotabato (Philippines))
Seven-year old cacao trees infected with vascular streak dieback (VSD) were assessed using an arbitrary scale of 0-4. The effects of the rate of triadimenol (Bayfidan EC.25 ai at 5, 10, and 15 ml/15 l of water as mainplots) and methods of application (soil drench and foliar spray as subplots) were observed for a ten month duration and analyzed in a split-plot design. There were no significant differences in VSD severity after six monthly application of triadimenol using the two methods and three dosages. Hence, dosages were increased to 10, 15 and 30 ml/15 li water. After four monthly applications, all triadimenol treated trees had significantly reduced infection compared with the control. Least infection was observed from trees drenched with 20 ml/15 l water. Results suggest that the use of fungicide at recommended dosage may not be effective at higher disease pressure especially when infection reached most of the secondary branches.
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