作物病菌一般分为霉菌（丝状菌）、细菌和病毒三类。其中，由霉菌感染引发的病害占所有病害的８０％。其中，像霉菌和细菌等微生物总是伴随作物的生长寄生在叶、茎等植株表面，一旦外界条件发生变化，就会侵入植株体内，造成作物发病。为什么在低温高、湿时易患霜霉病和灰... Crop germs are generally divided into mold (filamentous bacteria), bacteria and viruses three categories. Among them, the disease caused by fungal infection accounted for 80% of all diseases. Among them, such as mold and bacteria and other microorganisms are always accompanied by crop growth in the leaves, stems and other plant surfaces, once the external conditions change, it will invade the plant body, causing the crop disease. Why high temperature, wet susceptible to downy mildew and gray ...