| Garden plants are cultivated in many places because they can purify air, adjust climate and weaken noise. Nevertheless, insect pests endanger garden plants so rampantly that the plant growth and garden landscape are destroyed. From 2004 to 2005, Occurrence and integrated control of Orthaga achatina Butle and(warren) were investigated in Suzhou, Jiangsu Province, China. The results are showed as follwed:1. 110 common garden plants were investgted by universal survey, point count with periodical survey in Suzhou, Jiangsu province, China. The results showed that 84 plants were damaged in which the most affected included 31 kinds such as Cinnamomum camphora,Euonymus japonicus,Buxus microphylla,Platanus orientalis L..,Prunus cerasifera Ehrh.,Rosa chinensis. 180 kinds of pests were surveyed. The dominant species included 32 kinds such as Orthaga achatina Butler,Calospilos suspecta Warren,Diaphania perspectalis Walker,Micromelalopha troglodyte Graeser,Prodenia litura Fabricius,Anoplopora ehinensis(Forster), ect. The Prelimary List of Main Garden Plant Pests in Suzhou City was completed. on the basis of research finding which provide scientific foundations.2.Biological characteristics and occurrence law of Orthaga achatina Butler were investgated by systematical observation. The results showed that the larva of Orthaga achatina Butler spin and nest, then damaged leaf and tender shoots. Serious occurrence ruins all the leaves. Orthaga achatina Butler occurs with two generations. Last stage larvae live through winter in their cocoons on topsoil under the tree-crown or 1 to 3cm shallow soil layer. The overwintering larvae begin to pupate in the late April of the coming year. The peak stage of coocn formed by first generation is in the late June, the second generation from late August to early September. The optimal stage of chemical control is at the peak stage of coocn in two leaves.3. Biological characteristics and occurrence law of Calospilos suspecta Warren were investgated by systematical observation. The results showed that there were 3-4 completed generations with generation overlap during the growth of the larvae every year in Suzhou. Pupa lives through winter on topsoil under the tree-crown or wet and shallow soil layer. The adult peak of the first generation appears in late March. Larva emergence peak of each other generations is in late May, early June to July, late July to middle Augest and late September to October. From late October, Last stage larvae clime down fron trees and enter the soil to pupate and overwinter. The most serious damage was caused by second generation.4. Integrated control techniques of 2 kinds of pests were investigated. The results showed that they could be contolled by physics, engineing and chemical ect. For example, in winter or spring, controlling weed and removing dead material amonge garden plants, and deteriorating overwinter place of pests. In order to kill the overwintering larvae and pupa, if it is possible, surface soils under leave-crown could be plowed to decrease the basic number of overwintering pests; As for Orthaga achatina Butler, if control is careless, before its last larva leave out of nest on the tree, cocoon should be removed and destroyed by burning in time in order to alleviate damage by next generation. the results from experiments of chemical control showed that spraying 4.5％Ningchongsu WP 1500×, 30％acephate EC 330×to control Orthaga achatina Butler can achieve the effect up to 90％after 7 days. The results also showed that spraying 8％Gaoda EC 1000×can have the effect up to 90％after 15 days. Pyrethroid pesticide could control Calospilos suspecta Warren. The test showed that the value of LC50 of beta-cypermethrin EC to Calospilos suspecta Warren is 3.18mg/kg, by spraying 4.5％beta-cypermethrin EC 1500-2000×, Control effect was 91.75％-94.86％after 3 days and 94.55％-100％after 7 days. |
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