Integrated control of maind diseases and insects of Dendranthema morifolium

Abstract

Abstract: The main virus diseases, downy mildew, leaf spot, leaf-injuring insects and aphid' s natural enemies in Den-dranthema morifolicum were investigated and identified, and the development laws of pests and natural enemies were studied respectively. The effectiveness of integrated control of stem-tip culture, film covering, interplating with tall stalk crops, micronutrient application, terminal bud excising, and use of natural enemies were evaluated. The results showed that after the application of above integrated control measures, the virus-free rate and the yield-increasing rate of the seedlings from stem-tip culture were about 60% and over 50%, respectively. The incidence of downy mildew and leaf-spot decreased by 28% to 30%. The injurious insect density reduced by 40%. The detection of pesticides residue indicated that three pyrethroids insecticides such as cypermethrin, fenvalter-ate, and deltamthrin were applied one month before harvest, the residues in Dendranthema morifolium after harvest were 0.017,0.058 and 0.019mol稬^-1, respectively, and all lower than the relevant tolerance values.

Key words: Dendranthema morifolium, Disease and insect injuries, Virus-eliminating, Pyrethroids insecticides, Residue

CLC Number:

S435.672

WANG Jie, HU Huilu, ZHANG Chenglin, HU Yibing, LIU Mingfang . Integrated control of maind diseases and insects of Dendranthema morifolium[J]. Chinese Journal of Applied Ecology, 2002, (4): 444-448.

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