STUDY ON BENIGN CYCLE OF RURAL ECOSYSTEM AND SYSTEMATIVE MANAGEMENT OF SHANYI VIL- LAGE NEAR XIAOSHAN CITY, ZHEJIANG PROVINCE. V. Comprehensive Prevent and Control of Plant Disease and Insect and practical Implementation.
Zhao Haitang ,Hu Zhiliany,Lu Honggui and Zhang Shaoliang (Ningbo Institute of Agri cultural Sciences, Ningbo 315101) and Pei Yuesong ( Shanyi Village of Xiaoshan City .Zhejiang Province ): Rural Eco-Envi-ronment.No. 1,1993,pp. 12-17
The demonstrative expereriment on compre-hensive prevent and Control of pland disease and insect was conducted in a relatively large agricultural area (106.1ha) in Shanyi village during 1984 - 1986. The experimental results were extensively applied in production from 1987 to 1989. A techniques regulation in prevention of pesticide pollution has been formulated in the village. The integrated measures for prevent pesticide pollution include: working out the control strategyi applying pesticide in optimum period with rational dosei protecting and utilizing the natural enemies of insect i popularizing resistant plant varieties t spreading highly effective and less-persistent pesticides i applying N P and K fertilizers rationally t and so on. As a result, the remarkable economical , ecological and social benefits were achieved. The pesticide application dosage was reduced by 80. 6%. The residue, of organochlorine pesticides (such as BHC) in grain is in the range of permissible level (it was over the permissive level by 31. 6% in the past). The number of spiders in fields increased by 83. 3-180. 1% and that of Agamermis sp. (a kind of natural enemy of rice planthopper) raised to 3 times as high as that of the past.