A.慢性型病斑B.白點(diǎn)型病珥C.褐點(diǎn)型病斑D.急性型病斑
A.種子B.棉籽餅C.土壤D.病殘?bào)w
A.食葉害蟲(chóng)B.蛀桿害蟲(chóng)C.地下害蟲(chóng)D.蛀果害蟲(chóng)