The generations occurred undulatingly and overlap with each other.

豆野螟在自然變溫條件下卵的發(fā)育起點(diǎn)溫度和有效積溫分別為10.84℃和53.17日度AAA黄片一级二级三级，幼蟲的發(fā)育起點(diǎn)溫度和有效積溫分別為7.84℃和214.90日度，蛹的發(fā)育起點(diǎn)溫度和有效積溫分別為9.48℃和124.41日度。

The experimental results suggested that there were some rules during the fermentation as follows: pit temperature increased rapidly and then dropped at the beginning of the fermentation and kept stable eventually at 20～22 ℃; there was slight change in yellow water pH value at first and then pH value decreased gradually in middle fermentation stage and finally kept stable; the change rules of total acids of yellow water were opposite to pH change rules; the reducing sugar of yellow water increased at first and then dropped and kept stable eventually; there was almost no change in alcohol content of yellow water in prior fermentation period, and then it increased rapidly and dropped slowly and finally kept stable; gas production rate was as high as 550 L/d within the first week in fermentation and then dropped undulatingly and changed to zero or even negative gas production rate.

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