大豆受大豆胞囊线虫危害后,病株根系不发达,并形成____。
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大豆胞囊线虫是以____、____和____在土壤中越冬,是一种定居型内寄生线虫以2龄幼虫在土中活动寻找根尖侵入。
PH值高的土壤中大豆胞囊线虫胞囊数量远低于PH低的土壤。
A. 对
B. 错
What is the relationship between the two speakers?
A. Teacher and student.
B. Students in the same school.
C. Brother and sister.