最近,日本茶树发现两种新病害,介绍如下: 一、茶绿斑病:日本各地茶园早有此病,但未成灾害。1963年和1968年秋季,静冈县茶园发生该病,并造成严重的落叶。发病初期,叶背发生暗褐色和不规正的针头大小的隆起。隆起单独、数个乃至数十个群生,并不规则地扩大,呈痣状,叶片增厚到健康叶的1.5倍。病斑通常2—3毫米长,有时连结达5—10毫米。 Recently, two new diseases were found in Japanese tea trees, which are described as follows: I. Tea green spot disease: Tea disease in various parts of Japan has long been a disease but has not yet become a disaster. In 1963 and the autumn of 1968, the disease occurred in tea plantations in Shizuoka Prefecture and caused severe deciduous foliage. Early onset, leaf dark brown back and irregular needle size bulge. Uplifted alone, even dozens of groups and even the crowd, does not regularly expand, was mole-shaped, leaf thickening to 1.5 times the healthy leaves. Lesions usually 2-3 mm long, sometimes up to 5-10 mm.