Trap crop for green leafhopper (GLH) and tungro (RTV) management.
1987
Saxena R.C. | Justo H.D. Jr.
A trap crop is a small, early planting of a crop that is more attractive to insect pests than the crop to be protected and effective enough to justify using it instead of other control measures. A test was made using a trap crop instead of intensive chemical control of Nephotettix virescens in May-Sep 1986. RTV-susceptible IR42 was used as both trap crop and main crop. In trap-crop fields, 2, 3, or 4 border rows were planted 15 d before the main crop and sprayed each week up to 60 d after transplanting (DT) with cypermethrin at 0.05 kg ai/ha. The main crop was not sprayed. Fields without a trap crop, but sprayed with cypermethrin were the treated control. Unsprayed fields without a trap crop were the untreated control. Plot size was 11 x 17 m. Each treatment was replicated four times. At 65 DT, RTV incidence was significantly higher in the untreated control than in trap or insecticide-treated fields. Relatively higher nymphal and adult GLH populations were recorded. Yields were significantly higher in trap and insecticide-treated fields than in the untreated control. Although yield was highest in insecticide-treated fields, the cost of cypermethrin lowered net gain. Limited insecticide use also conserves natural enemies of rice pests.
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