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9 Things You Should Know About What Is Killing My White Pine Trees | White Pine Diseases
- Other spray treatments may also help manage this insect during outbreaks. Treatment of the top of the tree during midsummer, after adults have emerged from the wilted terminals, can kill weevils as they feed in this site, reducing overall numbers that may cause problems in the subsequent year. Also, as many weevils crawl to the trees in spring, treatment of the lower trunk at the same time spring terminal applications are made may also help kill some of the migrating overwintered insects. - Source: Internet
- White pine weevil spends the winter in the adult stage, under dropped needles and other sheltering debris, usually very close to previously infested trees. In spring, the adults crawl to trees, although some may fly when temperatures exceed 70 degrees F. Mating occurs on the bark of the tree. There is a period of feeding on the bark of the terminal branches. Feeding wounds are often marked by a point of resin. - Source: Internet
- Figure 4. White pine weevil damage on spruce. (Photo courtesy of David Leatherman.) - Source: Internet
- Timing is very important but difficult to determine. Sprays should be applied shortly before adults begin to feed on the terminal and lay eggs. The adults will likely begin to renew activity and move to trees during sunny days in April, when temperatures exceed 70 degrees F. In the Midwest, adult activity is often coincident with forsythia bloom; this may not be an available indicator in Colorado where forsythia is more rarely planted. A second application, two weeks after the first, is recommended to maintain coverage of the terminal. - Source: Internet
- Soil Treatments. Soil drench/injection treatments of the systemic insecticide imidacloprid (Merit, Touchstone, etc.) can prevent white pine weevil injury. These applications should be made in fall to allow sufficient time for uptake of the insecticide to the terminal in spring. Use of soil- applied imidacloprid also requires that the soil be sufficiently watered for a couple of weeks, to allow initial uptake by roots. - Source: Internet
- Figure 2. Terminal wilting associated with white pine weevil injury. Figure 3. White pine weevil larvae exposed under bark. - Source: Internet
- The white pine weevil (Pissodes strobi) produces a conspicuous injury to the terminal growth of spruce trees. In late spring, new growth wilts and dies back. The affected terminals wilt into a ‘shepherd’s crook’ form and the needles often become lighter colored before they ultimately die and drop. Because of this injury, affected trees have stunted growth and develop a bushy appearance with multiple leaders. Presently, injury by white pine weevil is almost entirely limited to higher elevation areas of the state and foothills, although significant problems do extend into Colorado Springs. - Source: Internet
- The primary injury by white pine weevil is esthetic, deforming the growth of the tree as co-dominant uninjured side branches later grow to form multiple new leaders. This can be prevented by forcing a single leader to be dominant, suppressing the others, which will allow the tree to ultimately restore nearly normal form. This can be achieved by selecting as the new leader the most vigorous side branch and pinching the terminal buds of the other side shoots. - Source: Internet
- Spray Applications. The standard approach to manage white pine weevil is to spray insecticides in spring so that they cover the terminal. This treatment is directed at the overwintered adults to kill them before they lay eggs. Current insecticides useful for this treatment would include products that contain bifenthrin (Talstar, Onyx), permethrin (Astro), or cyfluthrin (Tempo). Rates of use should be to the high-end of what is labeled, such as for bark beetles or borers. - Source: Internet
Video | What Is Killing My White Pine Trees
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