Sawfly Larvae Look Like Caterpillars . While this insect can cause a lot of foliar damage, they only exist for a short period of time and the tree will drop and regrow new leaves. The adult resembles a fly or a wasp without a constricted waist. Dusky birch sawfly, Craesus latitarsus, larvae on the leaves on a young silver birch tree, Betula pendula, Berkshire (#10594768) Framed Prints, Posters, … As larvae grow they become greenish-gray, and are yellowish-green when fully grown. The sawfly larvae may be confused with caterpillar and moth larvae, as they all look like worms crawling around on the leaves and stems of plants. Learn More About NC State Extension, We have several topic based e-mail newsletters that are sent out periodically when we have new information to share. Common examples include black-headed ash sawfly, dogwood sawfly, and dusky birch sawfly (see above photo). Working hand-in-hand with our partners at N.C. A&T and 101 local governments, we conduct groundbreaking research that addresses real-world issues in communities across the state. However, the best way to distinguish between sawfly larvae and caterpillars is by counting the number of prolegs (the suction cup-like nubs along the rear underside of the body). 0000015247 00000 n For the past three years, dusky birch sawflies have been feeding on the leaves for the entire month of July and sometimes into August. Not far away on a river birch tree, leaves have been stripped to the mid-vein, the work of the dusky birch sawfly. There is a single … The head is reddish yellow with black eyespots. 0000001379 00000 n 0000001565 00000 n This weekend as I was walking my dog down the greenway I noticed several heavily defoliated river birch branches overhanging the trail. In addition to the dusky birch sawfly, there are several common sawflies in Iowa that are bothersome to gardeners; the pearslug whose larvae feed on the leaves of a variety of fruit trees, the roseslug on roses, t he scarlet oak sawfly that feeds on oak, the willow sawfly, … A black edged bluish stripe runs along the middle of the larva's back for the length of its body. 0000016856 00000 n Dusky birch sawfly (Croesus latitarsus). Hello, We’ve have found a couple of caterpillers and can’t seem to come up with ‘what they are’. Oct 5, 2016 - Discover Life's page about the biology, natural history, ecology, identification and distribution of Craesus latitarsus - Dusky Birch Sawfly -- Discover Life Birch. It's co… Larvae are pale bluish-green, about 45 mm long and they look very similar to caterpillars. Want to see which lists are available? Subsequent to the hike in the park I did some quick research and found that these caterpillars are the larvae of the Dusky Birch Sawfly. Dusky birch sawfly larvae (Croesus latitarsus) in defence positions. Some larvae look like caterpillars with three pairs of large legs and seven pairs of smaller false legs. Distribution. Pest description and damage Mature birch sawfly larvae are yellowish with rows of black spots along the abdomen and 0.75 inch long. Life History. This is a guest post by PhD student Adam Dale originally posted on ecoipm.org. Habitat What made it so helpful? 0 Pest description and damage Mature birch sawfly larvae are yellowish with rows of black spots along the abdomen and 0.75 inch long. On the back they usually have a dark, narrow bluish longitudinal stripe. Not far away on a river birch tree, leaves have been stripped to the mid-vein, the work of the dusky birch sawfly. Although easily confused with Lepidopteran (butterflies and moths) caterpillars, sawflies are actually Hymenopteran (bees and wasps) pests. Birch trees, most commonly river birch in North Carolina landscapes native species only on. 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