Symptoms on dogwoods may also be caused by diseases or abiotic (environmental) factors. After the second molt, the larvae become covered with a white powdery material. 2. Refer to our pages on common dogwood diseases, abiotic problems, and tree care. When fully mature, pear sawfly larvae resemble green-orange caterpillars. Be sure to thoroughly cover all of the branches. During this time, ¼ inch long white ovisacs may be found on branches and twigs. Oysershell Scale (Lepidosaphes ulmi). The caterpillar overwinters in its burrow under the bark and pupates in the spring. Larger trees with ongoing infestations often develop rough, knotty areas on the trunk and large branches, and may lack vigor. The adult beetle emerges from infested twigs in the spring and the female lays her eggs in healthy twigs. The adult beetle emerges from infested twigs in the spring and the female lays her eggs in healthy twigs.Flagging of a branch caused by Dogwood Twig Borer infestation. If you catch the infestation when the caterpillars are small they can easily be removed by hand. It most frequently attacks trees that are stressed or injured. Dogwoods planted too deeply, inadequately watered during the first two years of establishment and drought periods, or physically wounded at the trunk (e.g., mower damage), are more susceptible to pest infestations. As the yellow-orange maggots grow, the tissue swells around them forming the characteristic gall. There is one generation each year and immatures overwinter on the twigs. The dogwood borer is the major pest of dogwood. To monitor for this pest, look for tiny (1/8 inch long), oystershell shaped, and brown to gray scale covers on the bark of wilting or dead branches. Adult sawflies, which resemble tiny wasps, emerge during late spring and early summer. Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Horticulture and Home Pest News, and Iowa State University Extension and Outreach. But it's the worm-like larva that causes damage to plants. When the sawflies are larger, one of the contact or systemic insecticides registered for control … Sawfly damage is caused by the larvae that feed on the plants in several different ways, depending on the species. •When the eggs hatch in mid-summer, the first stage larvae are tiny, yellow, and translucent. The adult is an elongate (5/8 inch long) beetle with long antennae. Ovisacs are white, cottony masses that contain eggs. Leaf and flower blight Irregular, brown, wrinkled patches form on flower bracts and leaves in the spring. The dogwood sawfly and sawflies in general can cause considerable defoliation because often they feed in groups. Older damage browns and can sometimes look like a disease lesion. Dogwood Borer (Synanthedon scitula) Adult. Spraying during the dormant season also lessens the impact on beneficial insects that are present during the spring and summer. The dogwood sawfly, Macremphytus sp., is an interesting sawfly because the second larval instar (stage in the larval development between molts) is covered in a white waxy covering and the last larval instar is yellow and black. The mature larvae are yellowish with a shiny black head and black spots. Basically they eat the green part of the leaf leaving a fine layer of clear leaf tissue. Just a few sawfly larvae on a large or mature plant may do little damage and can be tolerated. Selecting a tree appropriate for your site, planting it correctly, and providing regular care are essential steps to prevent common pest problems of dogwoods. Copyright © 2020ISU Extension and Outreach It will feed just under the bark in the cambium layer. 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