Plant Protection
Tea Weed Management
Species of Insect Pests in Tea


DENG Xin,TAN Ji-Cai (Hu′nan Agricultural University, Changsha,410128, China). 

There are 250hm 2 tea plantations in Heng Mountain,Hu′nan Province.Tea plants were planted in the early 1960's.

Peasants used organic chlorine pesticide and organophosphorous pesticide when they planted tea trees.Tea plant insect pests however seriously occurred such as Euproctis pseudoconspersa Stand, Empoasca ritis (gothe), Aleurocanthue spiniferus Quaint, Clania minuscaula Butler,etc.Since 1979,ecological control has been implemented and chemical pesticide has thus been prohibited.Planting trees around tea plantations and intercropping green crops or bean crops in tea plantations has improved the ecological environment.

Measures have been taken such as improving cultivation methods,increasing organic fertilizers such as manure,complex fertilizers with P and K,and protecting and using natural enemies to increase the ability of pest control.All the above mentioned measures can control pest attack.Systematic investigation has been carried out and the species and quantity of pests were analyzed by means of Principal Component Analysis (PCA.) The results showed that because the ecological environment is good and chemical pesticides haven't been used for many years,the species of insect pests and natural enemies are increasing.The numbers however are becoming fewer in tea plantations under ecological control.The ratio of pest to natural enemy population is in a more balanced state.The seasonal dynamics of this population is influenced by the weather,the state of growth of tea plants and the picking of tea leaves.The seasonal dynamics of insect pests and natural enemies and the state of growth of tea plants both show similar tendencies.From November to the next March is the over-winter period,from May to September is the peak growth period and the months of April and October are just two transition periods.

The seasonal dynamics show the following balanced phenomena between natural enemies,insect pests and tea plants.Such m easures as improving the ecological environment,strengthening the cultivation methods,decreasing the quantity of pesticides are a secure foundation to integrate the control of pests in tea plantations under ecological control.

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Keywords:Organic Silicone Agricultural Additive, Polyether Modified Trisiloxane, Organic Silicone Surface Agent, Wetter, Spray Regulator, Pests, Rice, Rice Weevil,
Aggregate Sheath Spot Of Rice, Piricularia Leaf Spot Of Rice, Brown Spot, Bipolaris Oryzae, Panicle Mite, Cockspur Grass, Cyperus Difformis, Forb Steppe,
Banded Sclerotial Blight, Tea, Tea Mosquito Bug, Helopeltis Antonii, Empoasca Flavescens, Tea Green Leafhopper, Tea Tortrix-Caterpillar,
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