Investigation On Occurrence Of Lycium Barbarum Thrips And Research On Biological Control Technology

Ningxia is the most famous producing area of wolfberry in the country.The yield and quality of wolfberry are in the forefront of the country.Due to the variety and serious occurrence of diseases and insect pests of wolfberry,the prevention and control of diseases and insect pests is the top priority of wolfberry production.In recent years,the harm of wolfberry thrips has become more and more serious,especially The flower thrips(Frankliniell aintonsa Trybom)has become one of the most harmful and difficult to control pests in the production of wolfberry.At this stage,the main control method for thrips in wolfberry production is chemical control,which brings pollution to the ecological environment and also brings huge risks to human health.Therefore,in this experiment,three wolfberry planting bases in Tongxin County,including Chrysanthemum berry,Yijie Manor,and Degu,conducted investigations on the main types of wolfberry thrips and natural enemies during the flowering and fruiting periods.According to the law of occurrence of wolfberry thrips in the field,artificial Release predatory natural enemies of thrips,introduce biocontrol products such as plant sources and microbial sources,carry out spraying tests with different concentrations of different biological sources,investigate,analyze and summarize the insect reduction rate and control effects of thrips,and screen out thrips.The best biological control technology provides a reference for the diversified biological control of wolfberry thrips,thus promoting the green and healthy development of the wolfberry industry in Ningxia and even our country.The main findings are as follows:1.The main types of thrips and natural enemies during flowering and fruiting periods.The species of thrips belong to 7 species,2 families,3 genera,and their overall proportions.The dominant species of thrips are thrips and thrips.The dominant species in the three bases in the flowering period are all thrips,and the fruiting period is in Degu The dominant species of Lycium barbarum is Flower Thrips,Yijie Manor is Thrips graminum,and Lycium Chrysanthemum is a Thrips.The natural enemies collected in the flowering and fruiting stages of the three bases belong to 3 families,namely Araneida and Calabash Insect family Coccinellidae and Anthocoridae,among them,the flower bug family includes southern flower bug O.similis and East Asian flower bug O.sauter.The dominant species in the three bases are ladybirds.2.The population growth of Lycium barbarum thrips presents a trend of double peaks,and it mainly harms the flowers and fruits of Lycium barbarum.The damage during the flowering period is greater than the fruit period.The four predatory natural enemies have obvious control effects on Lycium barbarum thrips,and the control time is more than one month,and the control effect continues to increase.There are certain differences in the control effects of different natural enemies,including the new small seiusi mite and the East Asian small flower bug.The control effect is better,Amblyseius cucumis is the second place,and Amblyseius cucumis is the worst.In terms of economic efficiency and safety,the control of predatory mites is better than conventional control,and the control of predatory mites can reduce the use of pesticides and improve fruit quality;but in terms of cost investment,conventional control is less than that of predatory mites;comprehensive benefit evaluation,predation Mite control is better than conventional control.3.6 kinds of biological agents have certain control effect on Lycium barbarum.The control effect from high to low is 1%lentinan aqueous agent>1.5%pyrethrin aqueous emulsion>0.3%matrine aqueous agent>0.8%emodin methyl ether suspension agent>1%osthole>6%rotenone microemulsion On the whole,the peak control effect of each agent appeared on the 5th day after the administration,reached the maximum on the 5th day,and began to decline after 7 days.The control effect of all biological agents showed a trend of low and high.On the whole,1.5%The control effect of pyrethrin water emulsion and 1%lentinan is the best,and the control effect of the two medicaments is more than 70%5～7 days after application.Therefore,1.5%pyrethrin is preferred when using biological agents to control wolfberry thrips.With 1%lentinan,the two medicines can be used interchangeably to prevent resistance.