This borer not only attacks dogwood trees but also plants in the genera Prunus, Malus and other plant genera. DWB can also be controlled by trunk sprays with residual insecticides: usually, a single application at peak emergence provides sufficient control. Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing and premature defoliation. Dogwood twig borer, Oberea tripunctata (Swederus), Cerambycidae, COLEOPTERA. 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. The best prevention for this insect is to protect the trees from wounds. As such, borer infestations usually are worse in neglected or abandoned orchards. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. Powdery Mildew: Erysiphe pulchra (formerly Microsphaera pulchra) is the fungus that attacks leaf surfaces and tender shoots and causes powdery mildew. Dogwood borer, Synanthedon scitula, was found for the first time in the 1980s as a common pest in the burr knots of apple trees. These root initials provide ideal locations for the dogwood borer to lay eggs and for larva to burrow and feed upon. Eggs hatch after 8 to 9 days and larvae bore into the tissue between the root initials and begin feeding. Placement much higher or lower in the tree may cause as much as a fivefold decrease in catch. The four wood boring insects mentioned below attack a wide range of trees. Identification of an Effective Mating Disruption Formulation for Dogwood Borer . Cultivated trees are usually more heavily infested than those in wood lots. The dogwood borer is a small, clear-winged moth that resembles a wasp and is the most problematic of the dogwood pests. DESCRIPTION. Species presence and flight activity can be monitored with pheromone traps. Mating disruption product Isomate DWB is also very effective in reducing the numbers of dogwood borer larvae although multiyear treatment need to be applied for the best efficacy. Dogwood borer almost never enter healthy bark or pruning wounds in apple trees. The dogwood borer, Synanthedon scitula (Harris), is an important wood boring pest of apple in eastern North America. Dogwood borers feed on a wide variety of forest trees. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. This Dogwood twig borer (Oberea tripunctata) missed the recent “Dining on Dogwood” episode simply because it wasn’t foraging among the dogwood’s white flowers; the BugLady found it in early July on a prairie plant (there was probably a red-osier dogwood nearby).The Dogwood tree borer’s name is a study in confusion. Insect Damage Dogwood Borer Synanthedon scitula. Pupation lasts about 25 days and begins in early June. Females have a wide yellow band on the fourth abdominal segment, compared to a much narrower band on the same segment of the males. Entering your postal code will help us provide news or event updates for your area. They can be applied as a liquid spray directly to the trunk and main branches of the host. Read about the Pesticide Safety & Education Program. There are a variety of insecticides and other chemical agents available to combat existing Dogwood Borer infestations. The adult is bluish black with yellow bands and has clear wings (A), resembling a wasp. They require ex-tra consideration and extra effort to address properly because they fall They may take 13 to 22 months to complete larval development. Rootstocks M.9, M.9/MM.106, M.26, MM.106, and MM.111 show some difference in susceptibility, but only MM.111 has a considerably lower infestation level. Timing is guided by trap captures for most species. If a dogwood tree is badly infested, it may be best to remove the tree to prevent it from infecting other dogwood trees in the area. Chemical control requires accurate timing. Feeding in the burr knot itself does little or no damage to the tree, while feeding below the bark is much more destructive and may eventually girdle the tree. Adults are typical black and yellow clear-winged moth similar to but smaller than adult lesser peachtree borer and peachtree borer, with a wingspan of only ¾ inch. We have all heard the fables about how even the smallest can bring down the mighty. It is closely related to the bronze birch borer, so its dam- Larvae are nearly white to light pink with a deep brown head capsule, and reach ½ inch at maturity. Wood borers are not especially prolific, but they can still do serious damage to your home if you don't handle them quickly. Use permethrin (Perm- Up 3.2 EC) or chlorpyrifos (Dursban) for dogwood borer control in commercial nurseries. New growth is covered with a fine, white, powdery coating, typically on the upper surfaces of the leaves. It attacks and kills healthy ash trees. Very young trees are frequently killed and older ones are left reduced in vitality and with dead and dying branches. Mating disruption product Isomate DWB is also very effective in reducing the numbers of dogwood borer larvae although multiyear treatment need to be applied for the best efficacy. Feeding is initially confined to the burr knot, but it sometimes spreads to healthy bark outside it. It will not be as effective, but will help reduce the number of dogwood borer larvae, which will reduce the amount of damage to the tree until you are able to treat the dogwood tree with dogwood borer insecticide. Larvae pupate in galleries in a cocoon made up of silken thread and covered by a layer of its reddish frass. Reddish frass on the surface of a burr knot is a visible sign of an active infestation by dogwood borer. It digs tunnels in the trunk or in burr knots (less serious, but indicative of potential problems) of trees, creating accumulations of reddish frass at the tunnel exits and causing loss of tree vigor (C). While dogwood borers can become a serious problem, once you know how to treat for dogwood borer larva … This information is for educational purposes only. Mating and egg laying occur within a few days of emergence. However, when trees or shrubs are transplanted into the landscape, stresses such as drought, soil compaction, sun scald, or injuries can weaken them and make them more susceptible to attack. Clearwing moths are the most common borers seen in commercial apple orchards in Ontario. Thorough coverage of burr knots and surrounding areas of the lower trunk in single sprays timed from pink stage through late June should provide excellent control. Because egg hatch begins about 9 to 10 days aft… General Characteristics Specific chemical recommendations for home gardeners are in Fruit Production for the Home Gardener , and recommendations for commercial growers are in the Penn State Tree Fruit Production Guide . Other plants attacked by this insect include flowering cherry, apple, mountain ash, willow and oak. Undiluted white latex paint applied by brush to the lower trunk before egg laying will significantly reduce infestations. The dogwood borer (Synanthedon scitula) is one of the most serious pests of flowering dogwood in Connecticut. The dwarfing rootstock, M.9, creates an abundance of burr knots. The emerald ash borer is an invasive beetle from northeast Asia that has caused significant damage to the native ash trees of North America. A triangle of three black spots is visible on the top of the thorax. The most common culprits are termites, wood-boring beetles, and carpenter ants. All surfaces of the lower trunk and burr knots need to be wetted thoroughly in order for insecticide applications to be effective. 3 (1 = rare 5 = annual) Severity. The increased severity of dogwood borer infestations in apple orchards is related to the introduction of dwarfing rootstocks. They are adaptable and although the bulk of a dogwood twig borer's diet is obtained from flowering dogwood trees, it can also feed on elm, azalea, and viburnum. According to the University of Delaware Extension, entomopathogenic nematodes are at least as effective on borers as insecticides and less damaging to the environment, Fighting dogwood borer requires the tree to develop new woody and leaf tissue at … In low to moderate infestations this should be done in August or September. Although NAA can be used to control burr knots, this is not desirable because it forces the larvae to feed into healthy cambium at the edges of burr knots. Although these borer injuries can kill trees, several consecutive years of infestation are often needed before the tree shows decline. Dogwood borer adult. Consult your local nursery or tree care specialist for details. Spores are spread by wind to surrounding dogwoo… Woodpecker damage is sometimes confused with that of wood-boring beetles; however, woodpecker damage will not produce frass. Regular insecticide treatments applied to control other orchard pests aid somewhat in controlling the roundheaded appletree borer. A member of the clearwing moth family, the dogwood borer, Synanthedon scitula (Harris), is one of the most destructive pests of flowering dogwood, Cornus floridaL., affecting plantings in homes and parks (Johnson and Lyon 1991). Several borer insects attack dogwood trees and, according to the University of Rhode Island Landscape Horticulture Program, they are the most threatening pest to established dogwoods. On apple, larvae feed inside burr knots, which usually develop on the exposed aboveground portion of clonal rootstocks. The issues affecting dogwood trees are too numerous for this writing, but we can cover some of the most common dogwoo… A • Several different borers can infest dogwoods. Common tree borers. MSU is an affirmative-action, equal-opportunity employer. Also, other borers, such as the American plum borer, may establish in the dead burr knots. Trunk injections deliver the insecticide directly to the tree saps, and trunk sprays require borers to move through an insecticide barrier to enter the tree. Control of peach tree borers in commercial orchards relies on preventing the larval establishment underneath the bark. The head is dark to almost black. These traps should be placed at about 4 to 6 feet above the ground for optimal catch. Females lay eggs on or near burr knots and are particularly attracted to trees with infested burr knots. Traps are available and useful for monitoring many insects of fruit crops, and the ones listed in the table that follows are probably the most important for most Illinois fruit growers. Pounce 384EC insecticide brings outstanding performance at an affordable price. Protect base of trees: mound soil around trunk (but not so high as to allow scion rooting), install mosquito netting, use white latex paint trunk for protection; destroy larvae with a knife or a metallic skewer. Keep area around the trunk weed-free and open to sunlight to decrease tendency for burrknot development. Insecticides should be timed to coincide with initial egg hatch in order to be effective. Adults emerge over a period of about three months, beginning in June. NY State Ag Experiment Station A. Borer infestations often go unnoticed until plants or parts of plants begin to die or show external signs of damage. Photo by G. Krawczyk. This page details the Dogwood Borer including size, territorial reach and pictures. Once under the bark, chemical control is ineffective. By entering your email, you consent to receive communications from Penn State Extension. JavaScript seems to be disabled in your browser. 5 (1 = very little damage 5 = plants killed) Hosts. Dogwood borer: The dogwood borer is a flying insect with a long slender body that almost looks like a bee with its black and yellow stripes. Frequency. The larva resembles that of peachtree borer (Synanthedon exitiosa) and lesser peachtree borer (S. pictipes), which are much larger and do not attack apple. Larvae are nearly white to light pink with a deep brown head capsule, and reach ½ inch at maturity. This product controls a variety of major pests in horticultural and row crops. inseCts_____ emerald Ash Borer found in illinois Emerald ash borer, Agrilus planipennis, has just been found in Kane County, Illinois, in what appears at this point to be a small infestation involving just a few trees. Two of the most common are the flatheaded apple tree borer, which is the larva of a beetle, and the dogwood borer, which is the larva of a moth. Adults may locate suitable egg-laying sites by responding to volatile chemicals that emanate from stressed trees. Adult – The adult is a slender beetle measuring 10 to 15 mm long and 3 mm wide. The adults frequently will get enough poison to kill them when feeding on the new bark or leaves. Advanced. ... Management of the insect includes removing branches that may have been affected, preventing scrapes and injury to tree bark (via mower and trimmers), and insecticides (always use according to label instructions). Pupal cases often protrude slightly from the tree and remain visible for up to a year after the adults have emerged. The dogwood borer, and recently introduced apple clearwing moth are all clearwing moths in the Sesiidae family. Larvae overwinter in a hibernaculum in one of their galleries and emerge early in the spring to continue feeding. To aid in the timing of sprays, pheromone traps are used to alert producers to the presence and activity of peachtree borer moths. Young trees are frequently killed and older ones are left reduced in vitality and with and... 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