玉米丝黒穗菌以什么孢子?在那些场所越冬?
参考答案:
病菌以散落在土中、混入粪肥或沾附于种子表面的冬孢子越冬,成为次年的初侵染来源,其中土壤带菌在侵染循环中最为重要。
何谓奇经八脉
I don’t think this question is ____than that one .It is ____of all.
A.easier, more difficult
B.easier, the most difficult
C.easiest, more difficult
D.easier, much more difficult