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2. Life Cycle and Behavior<br />
1. Beet armyworm Spodoptera exigua<br />
4-5 5 generations/year in mid-downstream mid downstream valley<br />
of Yellow River; overwinter as pupae in soil cells;<br />
cause the most damage from Jul. to Aug.<br />
No dipause. dipause.<br />
Occur and reproduce all over the<br />
year in tropic and sub-tropic sub tropic areas such as<br />
Guangdong.
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