| The tea white scab is a serious disease on sprouts in the domestic tea plantation. Its occurrence and epidemic have strongly negative effect against the tea quality and block the production and development of famous tea on mountain areas. In order to investigate the influences of this disease, the author collected infected leaves of various statuses during the period of tea white stab epidemic, and then determined some main chemical compositions, such as tea polyphenols, coffee alkali, amino acids and water soluble matter. The result shows that, with the illness index as 17.6, 27.5, 64.5 separately in the fresh tea leaves, the content of teak polyphenols is 1.8%, 7.7%, 11.4% lower separately than that in healthy leaves; the coffee alkali is 3.7%, 15.3%, 26.7% lower; the water soluble matter is 7.7%, 9.4%, 14.4% lower. It indicates that the essential components to the tea quality are being decreased. At the same time, the content of free amino acid is 65.8%, 106.8%, 115.7% higher separately, which may be related to the increasing activities of proteolytic enzymes and the degradation of the protein.The tea qualify is being concerned much more than before with the raising living standards. Due to the certain trend to keep the tea safe, free of pollution and toxicant, it is imperative to screen and apply efficient, low-toxic, and less-persistent bio-pesticide for such teas. By the dural culture method on PDA plates with pathogens,the author detached and purified 71 strains from samples of leave surfaces and soil, and screened out 14 strains antagonistic against the tea white scab. The re-screening inside laboratory shows that 10 out of 14 have the inhibition zone width of 6～14mm, antagonistic coefficient no less than 2.0. Three among them are functionally stable. The screening and application of these strains are the basis of the research to the bio-protection against tea white scab.
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