Study On The Structure Of Tea Plantation Population And Ecological Control To Insect Pests In South Area In Anhui

The background of the ecological control on tea pests was reviewed in this paper.Ecological control on tea pests is a new strategy of pest management.its pesculiarity,principles and methods were discussed.it is known that ecological control of pests is a piece of systematic works and the pest is just one element of the ecological system in tea garden.we should study all the main fctors in this system carefully and acquire much enough on the structures and functions of this system and then take steps to control them correspondingly.The research of ecological control on tea insect pests in Shizipu tea is the main task in this paper,as follow:1.Investigation of insect community,there are 88 Species of insect and mite pests from 42 Familias,10 Ordos and 2 Classes in this plantion.Leaf-feeders (Lepidotera:Lymantriidae,Psycidae,Limacodidiae )are the major ones,30 species, 34.09%of the insect pests community,leaf-suckers(Homoptera) are the second ones,20 species,22.72%of the insect pests community,and insect pests of Coleoptera are the third ones,12 species,13.63%of the insect pests community.There are over 60 Species of natural enemy from 30 Familias,10 Ordos,and 2 Classes. Predatory Ladybirds and Carabidae.Parasitic wasps.Spiders are the dominant species.2.By analysis of seasonal dynamics of insect pests community.The seasonal pattern of the community was divided into 4 phases,One was from October～December the year before to january～March,the second one was April～June,the third one was July,The fourth one is August～September.Some parameters of the community show that species richness of April～September was the hightest,diversity index of April～june was the smallest,evenness of April～September was the smallest,dominant indices of April to Septenber was the highest.So,the phase from April to Septenber was the phase of the number of the comunity increased and decreased greatly,also,it was the key phase of the number of the community increased and decreased greatly,also,it was the key phase for management.Results of principal component analysis showed that Ectropis obliqua hypulina Wehrli,T.aurantill Boyer et Fonscolombe,E.vitis(Gothe) et al occurrence manily from April to July.Adoxophyes orana Fischer von Rosl,Honona coffearia Meyrick et al occurence mainly from May to August.3.Studying the vertical distrbution of main insect pests and their naturel enemies.The vertical distribution pattern of main insect pests was divided into 3 parts. Insect pests maniy concentrated on the upsides,about 30cm high from the top of the tea vegetation,there were dangerous leaf-feeders and suckers(e.g.E.vitis(Gothe), T.aurantii Boyer et Fonscolombe,E.Spseudoconspersa Strand,C.minuscula Butler,,E.Obligue hypulina Wehrli and so on ) in here.Niche breadth and overlaping between T.aurantii Boyer et Fonscolombe and its natural ememies were calulated,as it did with E.vitis(Gothe)and its natural enemies.4.Suterling BT biological insecticides had little bad effect on environment after applying,and could kill much more pests,efficiently then others.The tests of Suterling to prevent and control Empoasca vitis(Gothe) in different tea gardens showed that Suterling 400 times diluting solution could exert excellent control effect against E.vitis(Gothe),the population reduce was 80-90%and the long-lasting effects of using suterling to control E.vitis(Gothe) is about 7 days.5.Using the Jiaduo insect killer lamp to control the tea pest,the result was showed that the pests lured and killed by killer lamp of the largest number are Empoasca vitis(Gothe ),Ectropis obligue hypulina Wehrli,Adoxophyes oranna Fischer on Rosl,Honona offearia Meyrick,Eurproctis pseudoconspersa Strand,Aleurocanthus spiniferus(Quaintance),Acanthopsyche subferalbata Hampsom and so on,it is very different that nine main pests killed from the plantation used of the lamp and its contrast plantation,at the same time,the lamp could atract some natural enemies.the propotion of beneficial insect to pest is from 1:736 to 1:411.the number of insects killed by the lamp increased after the May,the number in July was at peak,and then this number in August started to decrease.