DIỄN BIẾN BỆNH THỐI QUẢ CA CAO Phytophthora palmivora Butler (Peronosporales: Pythiaceae) VÀ BIỆN PHÁP PHÒNG TRỪ BẰNG MỘT SỐ THUỐC HÓA HỌC TẠI ĐĂK LĂK

The cocoa black pod disease (Phytophthora palmivora Butler) influences strongly to the cocoa yield and quality. They appear aroud year in cacao plantation, but it damage seriously in the rainy season, the highest disease rate and index was from at the end of June to mid September. Efficacy of some insecticides to the cocoa black pod disease were more than 60% such as Aliette 80 WP, Antracol 70WP, Kocide 61.4 DF at 10 and 20 days after spraying Conduct spraying 3 times: at mass flowering time, after fruit-bearing 21 day and after one month of the second time. The Aliette 80 WP gain the highest efficacy (74.86 %) at 10 days after spraying the third time, the Champion 77 WP had the lowest efficacy only (55.67%).