一、发病症状 甘蔗凤梨病不仅危害蔗种,也危害宿根蔗。用蔗茎作种的种苗,病原菌从伤口或种苗两端入侵,宿根蔗病原菌从收蔗时的砍口入侵。感病后蔗种砍口变红色,病势进展后,红色部分变为灰黄色,组织腐败,中心髓部变黑色,产生黑色粉状物(孢子),并发生凤梨味。此时,种苗完全被害,再经若干日,蔗株就只存纤维组织,节间呈空洞状。患病种苗多不发芽,能发芽者,也缺乏生长力,渐渐死亡而造成缺窝断行。 First, the incidence symptoms Sugarcane pineapple disease not only endangered sugarcane species, but also endangering sugarcane root. Seedlings planted with cane stems, pathogens from both ends of the wounds or seedlings invade, Rooting sugarcane pathogenic bacteria from the cuttings when invaded. After the illness, the cuttings of the sugarcane turned red. After the disease progressed, the red part turned grayish yellow and the tissue became corrupt. The central part of the medulla turned black and black powder (spores) was produced, and the pineapple flavor occurred. At this point, the seedlings were completely killed, and then after a few days, the cane plant only stores fibrous tissue, internodes were hollow. Sick seedlings are not sprouting, can sprout, but also the lack of growth force, gradually died and caused by missing nest break.