40％毒死蜱·噻嗪酮有机硅乳油防治螺旋粉虱田间药效试验

【目的】明确40％毒死蜱·噻嗪酮有机硅乳油对螺旋粉虱的防治效果和持效期，为螺旋粉虱防治提供科学依据。【方法】试验设40％毒死蜱·噻嗪酮有机硅乳油500、1000、2000倍液，48％毒死蜱乳油、10％啶虫脒微乳剂、20％噻嗪酮乳油、2．5％联苯菊酯乳油、4．5％高效氯氰菊酯乳油1000倍液，以及清水和空白对照处理；在螺旋粉虱成虫高峰期进行喷药试验。【结果】40％毒死蜱·噻嗪酮有机硅乳油1000倍液药后1、7、35d对螺旋粉虱的防效分别为100．00％、93．83％、和86．70％；药后2、7、14d观察，未见番石榴树出现药害现象。【结论】40％毒死蜱·噻嗪酮有机硅乳油对螺旋粉虱有较好的速效性和持效性，且对番石榴生长无不良影响，可作为螺旋粉虱的防治药剂在番石榴生产上推广应用。建议在螺旋粉虱成虫高峰期使用40％毒死蜱·噻嗪酮有机硅乳油1000倍液进行喷雾防治。

Controlling effects of 40% chlorpyrifos·buprofezin organosilicon EC on Aleurodicus disperses Russell under field conditions

Objective] The objective of the current study was to elucidate the controlling effects of spraying 40% chlorpyrifos.buprofezin organosilicon （EC） on Aleurodicus disperses Russell, and the duration of its effectiveness. Method] Guava plants were sprayed with different concentrations of 40% chlorpyrifos-buprofezin organosilicon EC （500, 1000, 2000 times diluted） and 1000 times diluted 48% chlorpyrifos EC, 10% acetamiprid ME, 20% buprofezin EC, 2.5% bifenthrin EC and 4.5% beta-cypermethrin. Water and non-pesticide treatments were used as control, field test was conducted during the peak period of Aleurodicus disperses Russell adults. Result ] Spraying 40% chlorpyrifos-buprofezin organosilicon EC resulted in 100.0, 93.8 and 86.7% control of Aleurodieus disperses Russell after 1, 7,and 35 days after treatment, and no phytotoxic symptoms appeared on guava plants until 14 d after spray. Conclusion] Field experiment results indicated that 40% chlorpyrifos buprofezin EC had high control effects on Aleurodicus dispersus Russell. The spray was also not found harmful for the growth of guava plants. A thousand times of dilution of 40% chlorpyrifos, buprofezin EC may be recommended for application in guava orchards during the peak incidences of Aleurodicus disperses Russell adults.