It will persist until spring and cause death of the adult beetles when mixed with the extender Pinolene 1902. To date, none of the natural factors have shown any promise of producing satisfactory control, even though they cause considerable reduction in weevil populations. White pine weevils prefer small trees - those generally 3 to 15 feet high. These insects especially attack white pines growing in the open or trees that are a little taller than others in the stand. Those attacked often have very thick leaders.
Trees growing in shallow soils with poor internal soil drainage are a prime target.
White pine should be planted only on suitable sites. The soil should be free of soil mottling or hardpan for at least a depth of 3 feet. Some protection against the insect occurs naturally. Weevils seldom attack white pine growing under the shade of other species of trees. The goal, at present, in growing white pine for timber, is to end a rotation period with a sufficient number of trees that have not been weeviled before attaining a height of about 18 feet.