Abstract
Abstract Two trials on farmers' fields in Pao, Manaoag, Pangasinan evaluated 15 foliar insecticides against postflowering insects, predominantly Heliothis. Each insecticide was ap-plied 2 or 3 times to 3 replicated plots (50 sq.m) by a manually operated, 19-1 knapsack sprayer with a fan jet nozzle in a randomized complete block design. Spray volume averaged 700 l/ha. All plots, including the check received preflowering insecticide - 0.25 kg ai Azodrin/Via on 2 and 12 days after crop emergence (DE). Plastic sheeting (1-m wide) was held between plots to prevent spray drift. Mung bean (3000,000 plants/ha) was broadcast sown and harrowed into tilled seedbeds (plowed and harrowed by draft animal power) on fields previously planted to puddled rice during the monsoon wet season. Fields were irrigated once to ensure even germination. Rainfall was 0 mm and the mean daily maximum and minimum temperatures were 31°C and 19°C, respectively for the crop period. The impact of Heliothis infestation was measured as % defoliation (visual estimate/plot), no. larvae (50 plants), % damaged green and dry pods (100 pods), and no. pods/plant (25 plants). Yield was based on 15 sq.m.
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