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Status of Tea Production and Pest Control in Japan
Shigehiro Kodomari 한국차학회 1998 한국차학회지 Vol.4 No.1
Japan, the total area of planted tea covers abort 52,700 hectares(in 1996) and the total annual production is about 88,700 tons. The greatest tea-producing region is Shizuoka prefecture, it has about 46% of the total tea production in Japan. There are several kinds of tea made in Japan is mostly green tea; it is non-fermented. Tea is harvested two or three times in a year. The first crop is plucked in late April to mid-May. The first harvested tea is the best quality and most valuable. The second crop is plucked in mid-late June and the third crop in early August, but recently the latter harvest is suspended. Nitrogen-, phosphate, and potassium-fertilizers of 540, 180 and 270㎏/hectare as pure ingredients of N, P and K, respectivly, are applied to the field annually in five split applications. There are many kinds of insect pests and diseases in tea fields of Japan. Nowadays the control of these insect pests and diseases depends on chemicals. These chemicals are tested with regard not only to their effectiveness against the pests but also residual toxicity and tainting which may give some influence to the quality of made tea. Then, the prohibited period of harvest after application is set up at all chemicals used at tea fields. But, it is desirable that the use of chemicals are minimized, as tea is an important drink for us and as the environment should be protected from pollution by chemicals. Therefore, non-chemical control methods are being studied, and some methods are already in practice.
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