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Control of the brown planthopper and the rice green leafhopper with lower dosage of certain chemicals



Control of the brown planthopper and the rice green leafhopper with lower dosage of certain chemicals



Plant Protection Bulletin 21(4): 383-390



Field tests were conducted during 1977 and 1978 to compare the efficacies of the presently recommended dosage (PRD), 1/3 of PRD and 1/2 of PRD of a number of insecticides. Tainan 5 rice variety was used in all tests. Chemicals were applied by a knapsack sprayer at 1200 l/ha. The dosage currently recommended for brown planthopper (BPH) control is 0.6 kg ai[active ingredient]/ha for 40% Hokbal EC [emulsifiable concentrate], 50% Unden WP [wettable powder], 40.64% Furadan F [flowable] and 75% Orthene SP [soluble powder] and 0.3% kg ai/ha for 20% MIPC EC. Only 40% Hokbal EC and 40.64% Furadan F showed non-significant differences when both were used at 0.6 and 0.4 kg ai/ha. Hence, the dosage of these 2 chemicals can be reduced from the PRD to 0.4 kg ai/ha for the BPH control. The dosage currently recommended for control of the rice green leafhopper is 0.6 kg ai/ha for 40% Kilval S [soluble], 75% Orthene SP and 50% Tamaron LC [liquid concentrate], and 0.33 kg ai/ha for Azodrin S. Results showed that the dosage of Azodrin and Tamaron could be reduced to 0.25 and 0.4 kg ai/ha, respectively, for the green leafhopper conrol while its population is low.

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