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我们大队水稻病虫害每年不同。据观察1972年是白叶枯病(7月上旬开始发生),1973年主要是稻瘟病和稻飞虱(7月下旬发生),1974年主要是稻纹枯病和二化螟(6月上中旬和7月上旬)。为什么每年发生的病虫不同呢?我们对此进行了对比分析
Our brigade rice pests and diseases vary from year to year. It was observed that bacterial blight (1972) occurred in early 1972, rice blast and planthopper in 1973 (occurring in late July), and sheath blight and rice stem borer (mainly on rice in June Mid and early July). Why does pest and disease occur differently each year? We conducted a comparative analysis