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Abstract: The field test showed that 10% chlorothiazide wettable powder had good control effect on tea green leafhopper, and the control effect was still more than 80% after 3,000~4000 times liquid medicine.
Key words: chlorothiazide; tea green leaf mites; control effect
The 10% chlorothiazide wettable powder is a nitromethylene-based systemic insecticide. The mechanism of action of chlorothiazide is to selectively inhibit the nicotinic acetylcholinesterase receptor in the insect nervous system, which competes with it very highly competitively to disrupt the normal conduction of the central nervous system. From 2001 to 2002, we conducted a field efficacy test in Yixing City, Jiangsu Province. The results showed that 10% chlorothiazide wettable powder had good control effect on tea green leafhopper. The test results are as follows:
1 Materials and methods
1.1 Test agent 10% chlorothiazide wettable powder (active ingredient: imidaclothiz, Nantong Jiangshan Pesticide Chemical Co., Ltd.); 10% imidacloprid wettable powder (Nanjing No. 1 Pesticide Factory).
1.2 Control objects Tea green leafhopper
1.3 Design and method of test treatment The experiment consisted of 10% chlorothiazide wettable powder 3 000, 4000, 5000 times liquid, 10% imidacloprid wettable powder 4 000 times liquid, water control, a total of 5 treatments. The area of ​​the cell is 33.3m2, and the random area group is arranged, repeating 4 times, there is a gap between the treatments, and there are protection lines around.
The experimental field is located in the tea garden of Shanggan Village, Zhangye, Yixing City, Jiangsu Province. The tea tree is 21 years old. The soil is sticky loess. The organic matter content is medium and the pH value is 6.5. The application time in 2001 is July 5, and the application time in 2002 is June 26th. The water consumption is about 50kg/667m2 and it is sprayed evenly.
1.4 Contents and methods of the survey Before and after the drug, 1, 3, 7d, the method was to use the pot method, check 4 points per plot, 1 pot (0.5m2) per point to record the amount of pelvic worms, and calculate the worm mouth compared with the pre-drug base. The rate of decline was compared with the rate of decrease in the control area, and the control effect was calculated.
2 Results and analysis
2.1 Control effect In 2001, the control effect on the 1st day after application: 10% chlorothiazide wettable powder 3 000, 4 000, 5000 times liquid treatment were 96.13%, 90.65%, 88.30%, respectively, the difference between treatments was not significant 3d control effect after application: 10% chlorothiazide wettable powder 3 000, 4 000, 5000 times liquid treatment were 96.12%, 91.85%, 87.50%, respectively, the difference between treatments was not significant; 7d after application Control effect: 10% chlorothiazide wettable powder 3 000, 4 000 times liquid treatment were 93.92%, 82.83%, the difference between treatments was not significant, 5,000 times liquid treatment was 75.92%, the difference was significant, see Table 1.
In 2002, the control effect on the 1st day after application: 10% chlorothiazide wettable powder 3 000, 4 000, 5000 times liquid treatment were 93.83%, 93.41%, 89.69%, respectively, the difference between treatments was not significant; After 3 days of control: 10% chlorothiazide wettable powder 3 000, 4000 times liquid treatment was 96.72%, 92.65%, respectively, 5,000 times liquid control effect was 89.30% compared with 3,000 times liquid, the difference was significant; The control effect after 7 days of application: 10% chlorothiazide wettable powder 3 000, 4 000, 5000 times liquid treatment were 83.90%, 78.89%, 76.86%, respectively, the difference between treatments was not significant.
2.2 After the safety of the tea tree, the symptoms of phytotoxicity were not observed in the tea planting area, and the same as the tea tree in the control area in the growth period and growth, indicating that the test dose of 10% chlorothiazide wettable powder was on the tea tree. Safety.
3 Summary and discussion The experimental results show that 10% chlorothiazide wettable powder has good control effect on tea green leafhopper, and it has both quick-acting and long-lasting effect on tea green leafhopper. 3000~4000 times liquid (converted to effective dose of 25~33mg/kg) has good control effect on tea green leafhopper and is safe for tea tree.
Ren Xinfeng, Wu Ming, Dai Baojiang (Nantong Jiangshan Pesticide Chemical Co., Ltd., Nantong 226006, China)
Efficacy test of 10% chlorothiazene wettable powder against tea green leafhopper
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