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葡萄白腐病菌侵染的主要条件是伤口和充分潮湿。对葡萄的任何绿色组织,通过伤口,都能发生侵染。在高湿度环境下,或在叶片吐水之际,水孔能成为侵染的途径。在葡萄穗上,它们是不可能作为伤口被肉眼分辨出来的,然而穗梗上的自然伤口足够为病菌所入侵。白腐病菌的孢子萌发和入侵,是与潮湿密切相关的。土壤由于下雨或灌溉而充分湿润,可由下列两条途径引起侵染:(1)水膜凝聚引起营养物质外溢,从而促使孢子萌发,以至进一步入侵。(2)由于葡萄的根压增高而引起叶片吐水,给病菌提高水、营养物质的供应量,导致入侵。
Grape whiteworms infection is the main condition of wounds and full moisture. Any green tissue on the grapes can get infected through the wounds. Water holes can become a source of infection in high-humidity environments or when the leaves are spitting water. On the grape spikes, they can not be visually identified as wounds, however, the natural wounds on the spikes are large enough to invade the germs. The germination and invasion of white rot fungus spores are closely related to moisture. Soil is fully wetted by rain or irrigation and can be infested in two ways: (1) Aggregation of water causes nutrients to spill, causing germination of the spores and further invasion. (2) Due to the increase of the root pressure of the grape leaves spit water, to improve the supply of bacteria and water, nutrient supply, leading to invasion.