Studies On Effect Of Tea Garden Environments And Cultivation Measures On Leafhoppers And Araneids And Control Over Leafhopper

This article has carried on the system investigation to leafhopper and its natural enemy spider of 10 different ecological environment tea gardens in Hangzhou,which is Shanlinjian tea gardens,Cufangxing tea gardens,Putongfengchan tea gardens,Youzhifengchan tea gardens,Ziyuanpu tea gardens,Cunzhuangbian tea gardens,Linxibian tea gardens,Fengjingqu tea gardens,Chalinjianzuo tea gardens,Shanposhang tea gardens.Finding out the changes rule of the leafhopper in the Hangzhou area,and analyzed the different environment and the cultivation measure influenced to leafhopper and the spider population dynamics,Also analyzed the spider to follow the leafhopper effecting,and propose a number of operational measures.On the other hand,using trap device in the tea garden to entrap leafhopper experiment,and investigate the number of leafhopper and others harmful insects.Assessment of traps effects in the fields,raising the best using program.At the same time,also has used the biological source chemicals Camptothecine to control leafhopper,From above two aspect's research,obtains the following conclusion:1.The leafhopper's seasonal change tendency can divide into four stages approximately:The first stage,late November to late May,insect mouth quantity has been at the temperature influence the low level;The second stage,early June to late July,presents the first insect fastigium,the insect mouth density is big and easy to cause the harm,prevents and controls the insect pest crucial phase; The third stage,early August to early October,presents the second peak.This stage tea garden factors and so on microclimate,natural enemy,tea garden nutritional conditions,tea garden management,the peak epoch difference is been big;The fourth stage,presents the third peak time mid-October to mid-November tea garden,but,the peak value relatively is low,moreover the duration is short,makes the inadequate severely impair to the tea. 2.The tea garden environment is better,more stronger control to the leafhopper,and insect density fluctuation is relatively stable,the peak is not prominent,the insect mouth density in controls under the target,has not caused the tea garden economic loss.Otherwise,the tea garden control ability is bad,and the insect pest is easy to erupt.Therefore,we can retains many other plants or interplanting economic value tree around the tea garden,increasing the tea garden ecological environment complexity,maintaining the tea garden ecosystem is balanced,increase the tea garden nature regulation ability。3.Thease factors influences the tea garden leafhopper,such as the agricultural chemicals, cultivation managerial technique etc.In the Hangzhou area,early June to late July and mid-September to early October is the leafhopper density two peaks,is also the most crucial phase to cure pest.In the tea garden which the leafhopper is serious erupt,the tea farmer should increase picking times to reduce the small green leafhopper harm in the production season;In the non-production season,the tea garden can be trimed reasonably.The tea garden removes weeds and applies fertilizer also has certain inhibitory to the leafhopper.4.Investigation to 10 tea gardens indicated that the leafhopper density in second year no realation to the preceding year.Moreover,the Xihulongjing tea only produced in the spring,not picked the fall tea.Therefore,we advise to prune suitably to the tea garden in the second leafhopper peak,do not use chemicals.The trim is relatively small influence to the spider quantity,and we can achieves the control harmful insect and protects the natural enemy,and also reduce the agriculture chemical vestigital and guarantee tea quality security.5.The investigation indicated that the spider has the obvious followed control to the leafhopper. The tea garden which ecological environment complex and rich plants,little or does not uses agricultural chemicals,the spider's species,the multiple indices and the uniformity are high,and the leafhopper erupt probability is low.We must reduce to use agricultural chemicals as far as possible,at the same time,strengthens the agricultural technology measure,protects and uses the tea garden natural enemy,maintains the tea garden ecosystem is balanced,increase the tea garden nature regulation ability.6.Using the trapping device that the bud green cardboard adhere to roundness rubber to entrap the leafhopper in tea garden,we set up 30,25,20,15 trap/667m~2 4 different density,the result indicate that 25 trap/667 m~2 is best to tempt the leafhopper,as well as ratio of the harmful insect and the natural enemy quantity is least.We suggested that the trapping device the best use density is 20-25/667 m~2.According to idea that "the public plant protection" and "the green plant protection", the trapping device one of the efficient paths to control tea garden pest with no harmful,and we advise expansion promotion this technique application in the tea-growing region. 7.We use Camptothecaacuminata to test effectiveness to leafhopper,the result indicate that A cream 150 times solution effect reach to 61.4%which is best of all disposee,maintain effects in previous 7 days.It can control the leafhopper effectively in the peak stage.The effects is worse than Imidacloprid,it is the natural plant source a.gricultural chemicals,the amount of use are very few now,so it can be used to green system to prevent and control leafhooper coordinated with other measures in the tea garden.In conclusion,tea garden environment and management measures obviously affect the population densitis of the leafhopper and its natural enemie araneids,infochemical preparation can be used to control the leafhopper,and extract of leaves of Camptothecaacuminata can kill the leafhopper to some exten extension.The conclusion can be referred in field practice.