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农作物的病虫大多在秋季繁殖后代,准备越冬。如螟虫的蛹寄生在稻柱里,稻青虫第四代发生在8月中、下旬,以蛹或幼虫在低温的杂草上越冬;稻苞虫和稻飞虱在8月上旬至9月下旬盛发,成虫在植物叶上产卵;细菌和病毒如稻瘟病、纹枯病、白叶枯病等,寄生在稻叶和种子上越冬。因此,在秋冬应不失时机地消灭越冬病虫。一、如何处理病源对病虫发生严重的田块,要单收处理。带病菌的稻草,不宜盖房屋,不宜留作饲料,应提前烧毁;染病稻草应单收单放,提前加工处理,以免传染其它谷粒。二、生物防治保护青蛙、蟾蜍;稻田放鸡鸭吃去
Pests and diseases of crops are mostly reproduced in the fall offspring, ready to wintering. Such as borers pupae parasitized in the rice, the fourth generation of rice blastworm occurred in mid-August, late, with pupae or larvae overwinter on the weeds at low temperatures; insects and rice planthoppers in early August to late September Sheng fat, adult eggs in plant leaves; bacteria and viruses such as rice blast, sheath blight, bacterial blight, parasitic in rice and winter overwinter seeds. Therefore, in autumn and winter should lose no time in eliminating the overwintering pests. First, how to deal with the disease on pests and diseases serious plots, to be received at a single handle. Straw with germs, should not be built housing, should not be left for feed, should be burned in advance; sick straw should be singly placed, processed in advance, so as not to infect other grains. Second, biological control to protect frogs, toads;