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4. IPM of Chestnut<br />
Choose resistant varieties<br />
Chestnut weevil resistant variety with<br />
bigger chestnut bud ( 栗 苞 ), denser and<br />
hardier bud-sting ( 苞 刺 ).<br />
Improve environment of chestnut orchard<br />
Delete other robur ( 栎 树 ) hosts inside or<br />
near chestnut orchards; plow soil in late<br />
autumn or before winter; clean deadwoods,<br />
fallen leaves and branches with galls.
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