Beet armyworm is widely distributed throughout the world,it can cause damage on many kinds of crops. Differences of morphological characteristics among beet armyworm,cabbage butterfly,cotton bollworm,cabbage armyworm ...Beet armyworm is widely distributed throughout the world,it can cause damage on many kinds of crops. Differences of morphological characteristics among beet armyworm,cabbage butterfly,cotton bollworm,cabbage armyworm and Prodenia litura（Fabricius）are compared,occurrence regulation,living habits,damage characteristics and control methods of beet armyworm are introduced.展开更多
We explored the influence of the artificial diets with different protein and glucose contents on larval development,fecundity and enzyme activities of the beet armyworm Spodoptera exigua （Hübner）.Our results su...We explored the influence of the artificial diets with different protein and glucose contents on larval development,fecundity and enzyme activities of the beet armyworm Spodoptera exigua （Hübner）.Our results suggested that development,fecundity and population growth index of beet armyworm increased with increased nutritional content in the artificial diets;however,when the yeast to cellulose content ratio reached 46.8：53.2,the fecundity and population growth had reached a maximum and additional protein did not yield additional growth.Additionally,3rd instar beet armyworm larvae fed on different artificial diets had increased enzymatic activities of acetylcholinesterase （AChE） with the increased nutritional content,but carboxylesterase （CarE） activities did not significantly change under variation in the nutritional content.展开更多
In this article, the selection of tebufenozide to beet armyworm （Spodoptera exigua Htibner） was studied by the treatments to alternative generations＇ 3rd-instar larvae with LC50 dose and to continuous generations＇...In this article, the selection of tebufenozide to beet armyworm （Spodoptera exigua Htibner） was studied by the treatments to alternative generations＇ 3rd-instar larvae with LC50 dose and to continuous generations＇ larvae with LC10 dose; the effects of tebufenozide on the biological characteristics of current and subsequent generations were examined by the treatments to 3rd-instar larvae and egg pods in different concentrations. After treatments with LC50 dose till F11, the toxicity of tebufenozide to beet armyworm had no significant change, whereas the pupation rate, pupal weight, and fecundity were reduced markedly. After treatments with LC10 dose till Fl9, the beet armyworm only developed 3.52-fold resistance, and the main biological characteristics were nearly accordant in each generation. The livability was reduced 72 h later after treatments to 3rd-instar larvae, respectively in 2.5-40 μg mL^-1, and larval duration, pupation rate, and pupal weight changed considerably with the increase in concentrations. The fecundity, larval livability, larval weight and pupal weight of subsequent generations were reduced as the dose increased over 10 μg mL^-1. The hatching rate of egg pods did not differ with that of the controls obviously after treatment in 10-300 μg mL^-1. But the larval livability, larval weight and pupal weight were reduced when eggs were exposed to 50 μg mL^-1 dose or more. The results indicated that tebufenozide had low resistance risk to the current and subsequent generations of beet armyworm even if tebufenozide had significant effects on the biological characteristics of this insect.展开更多
Three commercial neem [Azadirachta indica A. Juss (Meliaceae)]-basedinsecticides, Agroneem, Ecozin, and Neemix, and a non-commercial neem leaf powder, were evaluatedfor oviposition deterrence, antifeedant effect on la...Three commercial neem [Azadirachta indica A. Juss (Meliaceae)]-basedinsecticides, Agroneem, Ecozin, and Neemix, and a non-commercial neem leaf powder, were evaluatedfor oviposition deterrence, antifeedant effect on larvae, and toxicity to eggs and larvae of thebeet armyworm, Spodoptera exigua (Huebner) (Lepidoptera: Noctuidae), on cotton leaves in thelaboratory. Oviposition deterrence in no-choice, and two- and five-choice assays, was observed forthe neem-based insecticide treatments when compared with a non-treated control. Neem-basedinsecticides also deterred feeding by beet armyworm larvae. Direct contact with neem-basedinsecticides decreased the survival of beet army-worm eggs. Survival of beet armyworm larvae fed for7 days on leaves treated with neem-based insecticides was reduced to 27, 33, 60, and 61% for neemleaf powder, Ecozin, Agroneem, and Neemix, respectively. Possibilities for adoption of neem-basedinsecticides in commercial cotton for beet armyworm control are discussed.展开更多
[目的]通过田间试验,明确10%溴氰虫酰胺OD防治大葱主要害虫大葱葱斑潜蝇、蓟马和甜菜夜蛾的防治效果,为大葱害虫的综合治理和该农药品种推广应用提供依据。[方法]采用田间小区的方法,于害虫发生期对大葱进行10%溴氰虫酰胺OD不同剂量的...[目的]通过田间试验,明确10%溴氰虫酰胺OD防治大葱主要害虫大葱葱斑潜蝇、蓟马和甜菜夜蛾的防治效果,为大葱害虫的综合治理和该农药品种推广应用提供依据。[方法]采用田间小区的方法,于害虫发生期对大葱进行10%溴氰虫酰胺OD不同剂量的喷雾处理。[结果]10%溴氰虫酰胺OD对大葱斑潜蝇、蓟马和甜菜夜蛾均具有较好的防治效果。试验剂量36.0、27.0、21.0 g a.i./hm2处理均在第7天对葱斑潜蝇防效达到最高;在第5天对蓟马和甜菜夜蛾的防效均达到最高,防效均在80%以上。[结论]供试药剂10%溴氰虫酰胺OD对大葱斑潜蝇、蓟马和甜菜夜蛾可达到兼治的目的,且持效性较好。展开更多
文摘Beet armyworm is widely distributed throughout the world,it can cause damage on many kinds of crops. Differences of morphological characteristics among beet armyworm,cabbage butterfly,cotton bollworm,cabbage armyworm and Prodenia litura（Fabricius）are compared,occurrence regulation,living habits,damage characteristics and control methods of beet armyworm are introduced.
基金supported by the Natural Science Key Fundation of Chongqing Science and Technology Commission,China (2005BA1014)the Natural Science Fundation of Chongqing Education Commission,China (KJ060302)
文摘We explored the influence of the artificial diets with different protein and glucose contents on larval development,fecundity and enzyme activities of the beet armyworm Spodoptera exigua （Hübner）.Our results suggested that development,fecundity and population growth index of beet armyworm increased with increased nutritional content in the artificial diets;however,when the yeast to cellulose content ratio reached 46.8：53.2,the fecundity and population growth had reached a maximum and additional protein did not yield additional growth.Additionally,3rd instar beet armyworm larvae fed on different artificial diets had increased enzymatic activities of acetylcholinesterase （AChE） with the increased nutritional content,but carboxylesterase （CarE） activities did not significantly change under variation in the nutritional content.
基金This research was mainly funded by the Agricul- tural Ministry Commonweal Industry Research Project(200803007)the National Nature Science Foundation (30270887)the Shandong Agricultural University Postdoctor Foundation, China
文摘In this article, the selection of tebufenozide to beet armyworm （Spodoptera exigua Htibner） was studied by the treatments to alternative generations＇ 3rd-instar larvae with LC50 dose and to continuous generations＇ larvae with LC10 dose; the effects of tebufenozide on the biological characteristics of current and subsequent generations were examined by the treatments to 3rd-instar larvae and egg pods in different concentrations. After treatments with LC50 dose till F11, the toxicity of tebufenozide to beet armyworm had no significant change, whereas the pupation rate, pupal weight, and fecundity were reduced markedly. After treatments with LC10 dose till Fl9, the beet armyworm only developed 3.52-fold resistance, and the main biological characteristics were nearly accordant in each generation. The livability was reduced 72 h later after treatments to 3rd-instar larvae, respectively in 2.5-40 μg mL^-1, and larval duration, pupation rate, and pupal weight changed considerably with the increase in concentrations. The fecundity, larval livability, larval weight and pupal weight of subsequent generations were reduced as the dose increased over 10 μg mL^-1. The hatching rate of egg pods did not differ with that of the controls obviously after treatment in 10-300 μg mL^-1. But the larval livability, larval weight and pupal weight were reduced when eggs were exposed to 50 μg mL^-1 dose or more. The results indicated that tebufenozide had low resistance risk to the current and subsequent generations of beet armyworm even if tebufenozide had significant effects on the biological characteristics of this insect.
文摘Three commercial neem [Azadirachta indica A. Juss (Meliaceae)]-basedinsecticides, Agroneem, Ecozin, and Neemix, and a non-commercial neem leaf powder, were evaluatedfor oviposition deterrence, antifeedant effect on larvae, and toxicity to eggs and larvae of thebeet armyworm, Spodoptera exigua (Huebner) (Lepidoptera: Noctuidae), on cotton leaves in thelaboratory. Oviposition deterrence in no-choice, and two- and five-choice assays, was observed forthe neem-based insecticide treatments when compared with a non-treated control. Neem-basedinsecticides also deterred feeding by beet armyworm larvae. Direct contact with neem-basedinsecticides decreased the survival of beet army-worm eggs. Survival of beet armyworm larvae fed for7 days on leaves treated with neem-based insecticides was reduced to 27, 33, 60, and 61% for neemleaf powder, Ecozin, Agroneem, and Neemix, respectively. Possibilities for adoption of neem-basedinsecticides in commercial cotton for beet armyworm control are discussed.
文摘[目的]通过田间试验,明确10%溴氰虫酰胺OD防治大葱主要害虫大葱葱斑潜蝇、蓟马和甜菜夜蛾的防治效果,为大葱害虫的综合治理和该农药品种推广应用提供依据。[方法]采用田间小区的方法,于害虫发生期对大葱进行10%溴氰虫酰胺OD不同剂量的喷雾处理。[结果]10%溴氰虫酰胺OD对大葱斑潜蝇、蓟马和甜菜夜蛾均具有较好的防治效果。试验剂量36.0、27.0、21.0 g a.i./hm2处理均在第7天对葱斑潜蝇防效达到最高;在第5天对蓟马和甜菜夜蛾的防效均达到最高,防效均在80%以上。[结论]供试药剂10%溴氰虫酰胺OD对大葱斑潜蝇、蓟马和甜菜夜蛾可达到兼治的目的,且持效性较好。
