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3. Factors influencing population<br />
2) Culture<br />
Prefer summer sowing to spring sowing;<br />
avoid mixture of both sowing seasons.<br />
3) Natural enemy<br />
Over 70 predators and parasitoids found<br />
in China, such as pine caterpillar<br />
trichogrammatids, corn borer<br />
trichogrammatids and white<br />
muscardine fungi.
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