Effects of Different Field Configuration Modes on Population Distribution of Soybean Major Insect Pests
[Objective]Maize-soybean intercropping system has an significant impact on the population distribution of soybean major insect pests,this study was in order to clarify the effects of different field configurations on the main insect pests of soybean.[Method]The main pests were investigated while the distribution of natural enemy and the growth of soybeans was also analyzed.[Result]The numbers of major insect pests were the highest in soybean single-cropping system.In intercropping systems,the number of adult of Ergania doriae yunnanus,Paraluperodes suturalis nigrobilineatus Motsehulsky,Locusta migratoria,Nezara,Coreidae,Oncomelania hupensis were the lowest when the maize-to-soybean row ratio was 2∶ 4.The number of larva of Spodoptera litura Fabricius and A phis glycines Matsmura were the lowest when the maize-to-soybean row ratio was 2 ∶3.In these two configurations,the soybean growth-related indicators(plant height,canopy area,leaf area and leaf thickness)were close to that in soybean sole cropping system.Soybean could be maintain good growth condition,and the yield was closest to that in soybean single-cropping system.[Conclusion]The numbers of eight kinds of major harmful biology were the lowest when the maize-to-soybean row ratio was 2 ∶3 or 2 ∶4.These results suggested that the effects of control soybean major insect pests were the most effective in these two configurations.These two configurations could be used as optimization technology of maize-soybean intercropping system.This result can provide a theoretical basis for the reformation of maize-soybean intercropping system.
intercropped soybeanfield configurationnumber of insectsrate of insect