番茄叶霉病的防治方法。
(1)选用抗病品种
(2)温室消毒:定植前按每立方米空间用硫磺粉2g加锯末4-5g,密闭棚室后点燃,熏烟24小时
(3)药剂防治
45%百菌清烟剂(安全型)每亩次250g熏一夜
50%多菌灵可湿性粉剂1000倍液,75%百菌清可湿性粉剂500-700倍液
时间:发病初期。用法:喷洒,隔7-10天防治1次,共2-3次
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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