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《Journal of Anhui Agricultural University》 1986-01
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Zhang Han-gu Zhan Jia-man Zhou Chong-ming  
The small tea roller, Adoxophyes orana Fischer Von Roslerstamm(Lepdoptera: Tortricidae) , is the dominant insect pest of tea in China, especially in the regions of middle-lower reaches of Yangtze River.This paper deals with the biology and integrated control of this insect pest.The characteristics of the caterpilar's instars, the levels and undergoing days of the eggs and pupae in different temperatures have been made clear. The results can be used to predict when this pest will occur.The loss caused by the pest, not only on the yield, but also on the quantity of leaf tea, is remarkable.The regression equation of the population densities (caterpilars each clump) of this insect pest and losses of fresh tea leaves resulting from the pest(kg/mu) is y =10.04 lgx-5.84. On the basis of local price of fresh tea leaves (0.56 yuan/kg), the regression equation of the population densities (caterpilars/ clump)and economical losses of fresh tea leaves is Y=5.61gx-2.92. According to the above equations, it has been found that the economical threshold which is about 6—7 caterpilars per clump can be accepted,but in consideration of the relationship between the economical value of tea and the ecology of tea gardens, the control level may be relaxed to 10 caterpilars per clump.It has been discovered that the small tea roller can be preyed on or parasitized by more than twenty species of natural enemy. Spiders and Trichogramma spp.,for example, play a major part in suppressing the population densities of the pest, and some Bracon usually have a certain ability to control this insect naturally.As regards the integrated control of small tea roller, the method which combines releasing Trichogramma spp.at its egg stage, with plucking tea leaves or spraying Beauveria bassiana at its larval stage has achieved a desirable result. It has reached an objective of both protecting the natural enemy and maintaining the ecological balace to the environment of tea gardens. However, sometimes if tea trees are damaged seriously by this insect pest, and if the population densities of the pest can not be suppressed by the method mentioned above, the step which uses insectisides against this insect pest has to be taken into account.
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1 Chen Dihua;Li Taoshen(Wuhan Institute of Virology,Academia Sinica,Wuhan)Wang Minglong(Tea Research Station,Anhui Xuanlangguang Tea Co.,Langxi);Isolation,ldentificatation and Characteristics of Pathogenic Fungus of Ectropis obliqua P.[J];Journal of Tea Science;1990-01
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