Control Effects and Economic Efficiency Evaluation of 10 Fungicides Controlling Potato Late Blight Disease

Ten fungicides, such as 72 % Cymoxanil mancozeb WP, 50 % Acrobat WP, 25 % Azoxystrobin SC, 64 % Oxadixyl mancozed WP, 68 % Metalaxyl-M WG, 70 % Propineb WP, 68.75 % Fluopicolide SC, 18.7 % Cabrio-team WG, 25 % Mandipropamid SC and 50 % Carbendazim WP were investigated for potato(Solanum tuberosum L.)late blight disease control effects in field. The results showed that 9 of them except 50 % Carbendazim WP had obviously control effects(over 90 %)on potato late blight disease and yield increasing role with the rate of 10.90 %-20.30 %. And the net income could be raised to 7 500-15 000 Yuan per hm2. According to the disease control and yield increasing effects, the fungicides used in Guangdong Province for controlling potato late blight better follow the following order; firstly 72 % Cymoxanil mancozeb WP and 50 % Acrobat WP, then 68 % Metalaxyl-M WG, 18.7 % Cabrio-team WG, 25 % Mandipropamid SC, 70 % Propineb WP and 64 % Oxadixyl mancozed WP, etc.