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1991年5月份我们在喜马拉雅松引种育苗和防治松苗立枯病过程中,发现病苗根部组织内外及其附近土壤中,活跃着两种微生物,一种属于线虫类,另一种为螨类。据初步观察,这两种微生物以苗木幼根为寄主并对根部组织造成损伤;它们生活周期短、繁殖快、行动迅速;并能随着浇水、锄草等人类经营活动,活跃于病苗和健苗之间,将自身携带的立枯病病原菌传播给健苗,增加了苗木感染机会。它们虽不属
In May 1991, during the introduction of seedlings and the control of the seedling blight in the Himalayas, we found that two kinds of microorganisms were active inside and outside the root tissues of the diseased seedlings and the nearby soil, one belonging to nematodes and the other being mites. According to preliminary observation, these two kinds of microorganisms take seedling root as the host and cause damage to the root tissue. They have short life cycle, rapid propagation and quick action. They can also be active in the sick seedlings with the human activities such as watering and weeding And Jianmiao between, will carry their own blight pathogenic bacteria transmitted to Jianmiao, an increase of seedlings infected with the opportunity. Although they are not