Timing of control measures is important. If weevils are present, they should fall onto the sheet. If three or more weevils are found per tree, it would probably pay to spray with sevin . Refer to label for usage and precautions. If possible, spray the entire tree including the trunk and on the ground from the base of the trunk to the dripline of the tree.
Thorough coverage is important .
If pecans become infested with weevils, the first nuts to fall are often the ones most heavily infested. Pick up and destroy these nuts. In wooden bins , malathion may remain effective for up to 6 months. Methoxychlor may also be used. Reldan is effective 9 to 18 months.