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苦楝是我县“四旁”绿化的主要速生树种。近年来,由于遭到丛枝病的侵入危害,致使楝树生长停顿,逐渐枯死。今年八月,我们在下蔡大队、石鼓大队、更楼大队、东湖大队、鼓楼大队实地调查,共调查了517株,发病率为52%,感病指数为44.6;严重的株发病率在79.6%～81.5%,感病指数为73.5～76.6,死株率在4.6～7.1%。据初步观察,本病症状的表现有始发和后发之分。病害的始发症,多出现在主干或枝梢幼嫩部分(即夏梢或秋梢);病害的后发症,多出现在树木萌芽展叶部分(即春梢)。受害
Melia is my county “around” the main green tree species. In recent years, due to the invasion of the broom disease endanger the neem tree growth to a standstill, gradually dead. In August this year, we surveyed 517 isolates from the Lower Tsai Brigade, Shek Kwu Brigade, Gulou Brigade, East Lake Brigade and Drum Tower Brigade, with a prevalence of 52% and a Sickness Index of 44.6. The serious strain incidence was 79.6 % ~ 81.5%, the susceptible index was 73.5 ~ 76.6, and the dead strain rate was 4.6 ~ 7.1%. According to preliminary observation, the performance of the symptoms of the disease have originated and afterwards points. The onset of disease, mostly in the trunk or young shoots shoots (ie, summer tip or autumn shoots); disease complications, mostly in the sprout leaf section (ie, spring shoots). Victims