When populations are high, these summer feeding sawflies can cause serious defoliation because they eat both new and old foliage. When they hatch in the early part of spring, the larvae begin to feed voraciously on the needles of the pine trees. Characteristics: Sawflies may look like flies, but are actually related to bees and wasps.The common name sawfly comes from their ovipositor, which is saw-like in shape and is used by the females to cut into the plants and lay eggs. They then pupate in plant debris on the ground, maturing into adults by fall. Larvae of several sawfly species feed in late June through late July. Yellow-headed spruce sawfly on young, open-grown white spruce. Conventional insecticides such as malathion are also effective. Defoliation and browning of conifer foliage in the early summer may be the first signs of a sawfly infestation. This article was published by Michigan State University Extension. Keep an eye out for the following sawflies on your conifers. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464). Bt (Bacillus thuringiensis), which is an effective natural control for true caterpillars, is ineffective on sawfly larvae. ... Nice to see a new insect I has not noticed before, and to protect the little pine! These are hard to control and one of the most common sawflies in oak trees, along with pear slug and rose slug. July 15, 2011. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. redheaded pine sawfly. Insecticides will also kill these larvae, but be careful and only use these products if it is truly necessary to protect the tree since most sawfly populations are controlled by parasitoid wasps, and the wasps will be very susceptible to any insecticide that you use. If sawflies are in small numbers, you can usually clip out the colony and mash or otherwise destroy the larvae. For more information, visit https://extension.msu.edu. Note that Btk (Dipel), a product often used to control leaf-feeding caterpillars, is not effective on the sawfly larvae. Oak sawflies such as the pine sawfly will damage the leaves of scarlet, black, pin, and white oaks. Red Headed Pine Sawfly. Check out the MSU Landscape and Nursery Management Certificate Program! Several Weeks ago I saw these hidden in, and eating, the needles of a Scotch pine. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. Sawfly larvae are often mistaken for caterpillars, but are actually a primitive group of insects related to wasps and bees. roseslug sawfly. The female … To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. [n.d.] Field guide to common insect pests of urban trees in the Northeast. The natural insecticide spinosad will control sawfly larvae. ; Redheaded pine sawfly on red, Scotch and jack pine. The redheaded pine sawfly, Neodiprion lecontei, and the blackheaded pine sawfly, Neodiprion excitans, are found in Wakulla County and are native to the United States being found primarily east of the Great Plains and north into Canada. Hymenoptera Symphyta. Jack, red, and other pine: as above (for sawflies) First active mid-June to early July. white, black and blue spruce: as … MSU is an affirmative-action, equal-opportunity employer. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. most roses: as above (for sawflies) First active mid-May to mid-June.

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