3 research outputs found
Influence of Insecticides on Population of Major Insect Pests and Natural Enemies in Seedling Stage of Soybeans
Soybean aphid (Aphis glycines Matsumura) and soybean stem borer [Melanagromyza sojae (Zehntner)] are the major pest insects in the seedling stage of soybean, which cause 30% loss of soybean production in average year. The purpose of this experiment was to identify insecticides that have striking effects on aphids and with no clear injury on natural enemies. The overall target of the experiment was to protect natural enemies and apply them on keeping ecological balance in soybean field as well as to avoid eco-disastrous caused by chemical controlling happened in cotton field in North China and paddy rice field in the South.Originating text in Chinese.Citation: Wang, Qisheng, Shan, De'An, Ma, Zhenquan. (1993). Influence of Insecticides on Population of Major Insect Pests and Natural Enemies in Seedling Stage of Soybeans. Entomological Knowledge, 30, 333-335
Effects of Insecticides on Pest Populations and Their Natural Enemies in Soybean Field
In the 5-time field experiments and broad demonstrations, effects of volume and application formulae of several pesticides on the population densities of major inset pests and natural enemies in the soybean field were determined. Results from the Ducan’s multiple range test indicated that 300 g/ha of Omethoate (fine granule) and 45 g/ha of Fenvalerate in the seedling stage and 300 g/ha of Chloromethiuron suspensoid in the flowering stage may control pests and protect major natural enemies. Application of these pesticides in the corresponding soybean stages is an effective way that mediates the conflict between chemical and biological controls in the field. There are over 170 species of natural enemies whose hosts are known in the soybean field in China. These natural enemies play important roles in controlling the soybean pests. However, farmers still strongly rely on chemicals to control these pests because natural enemies are not able to timely curb the pest infestations when there is a pest outbreak. Frequent chemical application in a higher volume will ruin the ecological balance. The conflict between biological and chemical controls has become a hot issue in the soybean production worldwide. Our objectives in this study are to decide the effective low concentrations of commonly used pesticides, determine the effect of the third and fourth generations of pesticides on the major insect pests and natural enemies in the soybean field and propose feasible control methods by coordinating control and chemical controls.Originating text in Chinese.Citation: Qi, Yaoxun, Ma, Zhengquan, Shan, De'An, Gao, Xiaohua, Wang, Qisheng. (1987). Effects of Insecticides on Pest Populations and Their Natural Enemies in Soybean Field. Plant Protection (Institute of Plant Protection, CAAS, China), 13, 4-6
[Excerpts from the Book]: Natural Enemies of Soybean Aphids
Originating text in Chinese.Citation: Ma, Zhenquan, Shan, De'An, Qu, Yaoshun, Gao, Xiaohua. (1986). Excerpts from the book. Natural Enemies of Soybean Aphids, (pp. 49-177)