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葡萄树得了毛毡病,喷甲基托布津、多菌灵、退菌特等杀菌药。都没有防治效果,这是为什么呢? 因为葡萄毛毡病并不是由细菌引起,而是由一种锈壁虱(虫体圆锥形,体长0.1~0.3厘米)寄生所致。毛毡病主要危害叶片,也危害嫩梢、幼果、卷须及花梗。叶片被害部位表面凸起,背面凹陷,密生毛毡状绒毛。初为灰白色,后稍带红色,最后变为暗褐色,叶表凹凸不平,早期落叶,那么,怎样防治毛毡病呢?
Fungus got a blanket disease, thiophanate-methyl thiophanate, carbendazim, detoxification special bactericidal drugs. There is no control effect, which is why? Because grapefruit disease is not caused by bacteria, but by a rust tick (parasites cone body length of 0.1 to 0.3 cm) parasitization. Felt disease mainly leaves, but also endanger young shoots, young fruit, tendrils and pedicel. The surface of the damaged parts of the leaves are raised, the back of the depression, dense hairy furred hair. The beginning of the gray, slightly reddish, and finally turned dark brown, leaf table uneven, early leaves, so how to prevent blanket disease?