柏木苗期绣球病,又名油头病。危害一至四年生的柏木苗。一九七三年全县苗圃百分之六十以上受害,严重影响苗木的产量和质量。其中粉柏受害又比油柏为重。 柏木绣球病,一般从每年三月下旬发生,五至七月为盛发期,十月下旬发病停止。如果夏秋两季高温干旱少雨,发病严重且蔓延快。发病初期苗木初生叶顶芽向内弯卷,呈绣球状,绣球外围或有白色丝状物,最后顶芽全部枯死,呈褐色。苗木高生长停 Cypress seedling hydrangea disease, also known as oily disease. Harm to one-year-old cypress seedlings. In 1973, more than 60% of nurseries in the county were harmed, seriously affecting the yield and quality of seedlings. Among them, pollen damage is heavier than oil cedar. Cypress hydrangea disease, generally occur from the end of March each year, from May to July for the Shengfa period, onset in late October to stop. If summer and autumn, high temperature and drought arid, severe onset and spread quickly. In the early stage of the disease, the seedlings of young leaves begin to curl inwardly and curl inwardly, forming hydrangea. The periphery of the hydrangea or white silk is the last of the buds to withered off and brown. Seedling high growth stop