On-farm research on chemical control of some diseases of dryland crops grown before and after rice

Seed treatment with Ridomil at the rates of 0.5 to 0.125 g a.i./kg seed controlled downy mildew of corn planted before rice in Pangasinan. The disease incidence was lower in Macapuno variety and in early planting the control in sweet corn was reflected statistically on yield. The cost of control by Ridomil comprised only 1% of the gross income, the highest of which was P5053.38 compared to that of untreated, P498.22, for sweet corn in April 25 planting. For powdery mildew of mungbean planted after rice in Pangasinan and Iloilo, the 0.15- and 0.30-g benomyl/l H2O-rates were equally effective statistically. Thiophanate methyl incurred expenses which comprised only approximately 10% of the gross income in Pangasinan