Observations on life cycle, habits and characteristics ofBiston betularia (L.), which is a major pest infecting birch, were made in Daxing’an Mountain forest area, Heilongjiang Province during 1997–1998. In this are...Observations on life cycle, habits and characteristics ofBiston betularia (L.), which is a major pest infecting birch, were made in Daxing’an Mountain forest area, Heilongjiang Province during 1997–1998. In this area, the pest has one generation per year and overwinters as eggs in cracks of the lower part of stem. Adults emerge from mid-July to late August, and the damage of larvae occurs mainly in May and June. Life cycle table ofBiston betularia was given and control suggestions were made in this paper.展开更多
[Objective] The paper was to determine the optimal control period of Biston suppressaria, the most serious defoliator in eucalyptus forests in southern Fujian Province. [Method] By spraying 2% abamectin + Bacilus thur...[Objective] The paper was to determine the optimal control period of Biston suppressaria, the most serious defoliator in eucalyptus forests in southern Fujian Province. [Method] By spraying 2% abamectin + Bacilus thuringiensis powder in the forest, the first generation larvae of B. suppressaria was controlled in the early damage stage(May 2), middle damage stage(May 13) and late damage stage(May 30), respectively.[Result] When 500 g of pesticide was sprayed per 667 m^(2) in the early damage stage of the first generation larvae, the population reduction rate was97.5 % at 5 d post spraying. When 500 g of pesticide was sprayed per 667 m^(2) in the middle damage stage, the population reduction rate was 95.3% at 5 d post spraying. When 1 000 g of pesticide was sprayed per 667 m^(2) in the late damage stage, the population reduction rate was 83.9%, conspicuously lower than those in the early and middle damage stage. If pesticides were sprayed in the early and middle damage stage, the second gen-eration larvae would not cause harms, but the second generation larvae would cause slight harms if pesticides were sprayed in the late damage stage.[Conclusion] Control before the middle damage stage has significant effect on improving the control effect and reducing losses while reducing the usage of pesticides.展开更多
于广东省中山市南蓢镇翠亨村木荷上采集油茶尺蠖5龄幼虫,参照Ellman et al.(1961)的方法测定高浓度(20倍液)氯胺磷处理后油茶尺蠖乙酰胆碱酯酶的活性,结果显示,20倍稀释液氯胺磷对油茶尺蠖乙酰胆碱酯酶活性的抑制率为9.09%。于鸡屎藤叶...于广东省中山市南蓢镇翠亨村木荷上采集油茶尺蠖5龄幼虫,参照Ellman et al.(1961)的方法测定高浓度(20倍液)氯胺磷处理后油茶尺蠖乙酰胆碱酯酶的活性,结果显示,20倍稀释液氯胺磷对油茶尺蠖乙酰胆碱酯酶活性的抑制率为9.09%。于鸡屎藤叶背面和藤上采集桃蚜,配制80倍、160倍、240倍、320倍、400倍氯胺磷稀释液,在实验室用喷雾法测定氯胺磷对桃蚜的毒力,结果表明:随着氯胺磷浓度的增加,其防治效果越好,稀释80倍的氯胺磷溶液在24 h内桃蚜死亡率达90%。展开更多
文摘Observations on life cycle, habits and characteristics ofBiston betularia (L.), which is a major pest infecting birch, were made in Daxing’an Mountain forest area, Heilongjiang Province during 1997–1998. In this area, the pest has one generation per year and overwinters as eggs in cracks of the lower part of stem. Adults emerge from mid-July to late August, and the damage of larvae occurs mainly in May and June. Life cycle table ofBiston betularia was given and control suggestions were made in this paper.
基金Supported by Basic Research Project of Public Welfare Research Institutes of Fujian Province(2017R1011-8)Subproject of National Key Research and Development Program (2018YFD0600202)Key Laboratory Project of Timber Forest Breeding and Cultivation for Mountainous Areas in Southern China of State Forestry Administration。
文摘[Objective] The paper was to determine the optimal control period of Biston suppressaria, the most serious defoliator in eucalyptus forests in southern Fujian Province. [Method] By spraying 2% abamectin + Bacilus thuringiensis powder in the forest, the first generation larvae of B. suppressaria was controlled in the early damage stage(May 2), middle damage stage(May 13) and late damage stage(May 30), respectively.[Result] When 500 g of pesticide was sprayed per 667 m^(2) in the early damage stage of the first generation larvae, the population reduction rate was97.5 % at 5 d post spraying. When 500 g of pesticide was sprayed per 667 m^(2) in the middle damage stage, the population reduction rate was 95.3% at 5 d post spraying. When 1 000 g of pesticide was sprayed per 667 m^(2) in the late damage stage, the population reduction rate was 83.9%, conspicuously lower than those in the early and middle damage stage. If pesticides were sprayed in the early and middle damage stage, the second gen-eration larvae would not cause harms, but the second generation larvae would cause slight harms if pesticides were sprayed in the late damage stage.[Conclusion] Control before the middle damage stage has significant effect on improving the control effect and reducing losses while reducing the usage of pesticides.
文摘于广东省中山市南蓢镇翠亨村木荷上采集油茶尺蠖5龄幼虫,参照Ellman et al.(1961)的方法测定高浓度(20倍液)氯胺磷处理后油茶尺蠖乙酰胆碱酯酶的活性,结果显示,20倍稀释液氯胺磷对油茶尺蠖乙酰胆碱酯酶活性的抑制率为9.09%。于鸡屎藤叶背面和藤上采集桃蚜,配制80倍、160倍、240倍、320倍、400倍氯胺磷稀释液,在实验室用喷雾法测定氯胺磷对桃蚜的毒力,结果表明:随着氯胺磷浓度的增加,其防治效果越好,稀释80倍的氯胺磷溶液在24 h内桃蚜死亡率达90%。
