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A preliminary study on the efficacy of biological pesticides in the control of rice leaf roller
Due to the rising resistance of rice pests, we selected several highly potent and low-toxic biological pesticides and other pesticides for field efficacy trials to further select drug species and verify the efficacy of various pesticides, providing a basis for pest control in the field. 1 Materials and methods 1.1 Test crops and control objects Test crops rice; Control object Three generations of leaf roller. 1.2 Test Overview The test was conducted at Zhangye Rice Base in Xishan District. During the test period (July 26-29, 2003), the weather was fine and the average temperature was higher than 38°C. 1.3 Trial design (1) 55% killing-Sue 50g killing insecticide 75g per mu; (2) killing Su 100g with 55% mu; (3) killing insecticide 100g per mu; (4) using Gram-negillin 80g+ Insecticide single 60g; (5) mu BT100g ten insecticide single 75g; (6) CK1 each treatment Mu Wenningning 250ml plus efficient big meritorious 20g, watering 50kg spray control. The experiment was conducted at 5 pm on July 26, 2003. The amount of mu sprayed was 50 kg. 1.4 Survey time and methods 3 days after the application of the survey, 4 points for each treatment, 5 points per point, 20 points in total, calculation of the number of holes and residual live worms, and comparison with the control area to calculate the rate of beam loss and prevention effect. 2 test results with 55% killing Su 50g + insecticidal single 75g, 55% killing Su 100g, insecticidal single 100g, Kefening 80g ten insecticide single 60g, BT 100g + insecticide single 75g each treatment 3d after rice vertical The leafhoppers all had better control efficacy and the average insecticidal effects were 95.73%, 90%, 95.42%, 86.46%, and 90.31%, respectively (see table). After drug observation, rice leaves grew normally. 3 Summary and evaluation 3.1 55% killing the Soviet Union and other agents for the control of rice leaf roller have a better effect, control efficiency are more than 86%; 3.2 production can be reasonable to use more than each formula; 3.3 each treatment of rice Blades are safe and harmless.