| The harms caused by hetaohei is more seriously in old walnut orchards, andthe pests of young walnut orchard occur rampant. In this paper, the author hasstudied on arthropod communities in2different walnut orchards, Clear the majorpest species of the two types of Walnut. The occurrence regularity and controlof major pests has been studied. It can be expected to provide the theory andpractice for the production of walnut and pests control work. The studies resultsas follows:1.The arthropod communities on walnut in shanyang and yangling had beeninvestigated.The results sowed that the community was composed of2classes,12orders,67families153species in Shanyang old walnut orchards. the major pestswere Atrijug1ans hetaohei, Chrysomelidae sp., and Chromaphis juglandicola. Thecommunity was composed of2classes,12orders,34families51species inYangling young walnut orchards. It’s major pests were Cnidocampa flavescens,Acrocercops transecta and Cicadella viridis.2. The occurrence regularity and control of Atrijug1ans hetaohei has beenstudied. Atrijug1ans hetaohei occurred2peak occurrence period every year.It’s mid-June and mid-July. Control efficacy of different mulching material,deep plowing and the closed soil treatment with pesticide, Spraying pesticideto the tree on hetaohei was83.38%-87.90%,68.78%,83.38-87.90%. The controllingexperiments in field showed that5%Asfenvalerate EC,2.5%Cyhalothrin EC and5%Fenvalerate-malathion EC have higher controlling efficacy on hetaohei.3. Spatial Distribution Pattern and Sampling Technique of Cnidocampaflavescens Larva in Walnut. The results showed that Cnidocampa flavescens larvaein walnut was in aggregative distribution. more aggressive with populationdensity increase. The gathering was caused by their life habit and environmentfactor. The formula of optimum theoretical sampling was n=t2/D2(6.8456/x+0.9966). The controlling experiments in field showed that2.5% Alphamethrin EC,1.8%Abamectin EC and5%Chlorbenzuron SC have highercontrolling efficacy on Cnidocampa flavescens. |
PDF Full Text Request