Fast growing cultivars are especially vulnerable to the borers. The adult borers are beetles that make small holes in the branches and lay their eggs inside. Rhododendron Stem Borer (A 298-802) Lilac/Ash Borer (A,L 148-400+) [DC] Tarnished Plant Bug (N,A 437-1637 ){DV} ** CCS. This causes the branch tip to brown and die. As the borers mature they grow to almost ½ inch long and are yellowish white with brown heads. Timing Insecticide Control of Rhododendron Borer with Pheromone Trap Catches of Males. Q&A related to Rhododendron Borer. Copyright © 2020 University of New Hampshire, TTY Users: 7-1-1 or 800-735-2964 (Relay NH), Identifying Common Sweet Corn Caterpillars [fact sheet], Integrated Management of Sweet Corn Insects in New Hampshire [fact sheet]. Damage can be seen in curled leaves with callus tissue at mid-vein. Some references suggest that this insect takes two years to complete its development, while others say three. By the time root damage is noticed, it is too late to save the plant. The rhododendron stem borer is the most common beetle borer in shrubs. Blueberry stem borer is a beetle also known as the rhododendron stem borer and the azalea stem borer. FYI there’s a separate and distinct Rhododendron stem borer Cut out and destroy all affected tissue – or save a sample to send to a lab. The pupal stage is brown and 5-9 mm long. Although some insecticides may kill the adults when they are active, I do not recommend spraying for this pest. (C 802-2000)*AHoly= American Holly Plants in bloom abreviations. A: Rhododendron borer is the larvae of a clear-winged moth which lays its eggs on the bark of a rhododendron. Rhododendron stem borer, Oberea myops. The adult female lays eggs on the bark of the plant. Rhododendron stem cut away to show tunnel of stem borer, Oberea myops Haldeman. Rhododendron Stem Borer (Oberea myops) Damage caused by the stem borer, which includes wilting terminals and dieback, is similar to the Rhododendron borer. Rhododendron stem borers have been known to attack any type of azalea. Montgomery County Ohio. ... OUTSIDEUS rhododendron rhododendron problems england submitted over 1 year ago. At first, the tunnel is small diameter, but as it bores farther down, it gets larger. — Read our The wings are transparent with a rusty-black fringe and some yellow scales. You’d have to carefully peel away the outer layer of the shoot, to find the egg. Possibly: Oberea tripunctata (or maybe myops). Look for leaf yellowing, dieback and the presence of gummosis and/or frass at the root crown. The ½-5/8” long adults are slender long-horned beetles with yellowish brown heads and thorax. Baltimore County MD rhododendron rhododendron stem borer submitted 7 months ago. NC State University and NC Rhododendron Borer The abdomen is also black and blue with segments two, four, and five trimmed with yellow dorsally; legs are yellow and white apically and dark with some light color markings basally. Seasonal Response of Six Male Sesiidae of Woody Ornamentals to Clearwing Borer (Lepidoptera: Sesiidae) Lure. The adult rhododendron borer moth, Synanthedon rhododendri, is a small, black, slender moth with three narrow yellow bands across the abdomen. At least two types of bird create holes in the bark of trees to access food. The rhododendron borer is the larva of a clear-winged moth while the rhododendron stem borer is a longhorned beetle. In late June and early July, new infestation sites are easy to spot because of the dying shoots that have the messy girdling. The pronotum (section just behind the head) has two black dots. Moths of rhododendron borers are small, wasp-like insects. commitment to diversity. It overwinters as a larva, usually boring low somewhere in the plant, possibly an adaptation to improve winter survival. The beetle is nearly identical in shape to its close relative, the raspberry cane borer. Host plants include blueberry, rhododendron, azalea, and mountain laurel. Adult beetles feed on the underside of leaves on the midvein, causing the leaves to curl. 8 Responses. Eliminating nearby unmanaged hosts (azalea, rhododendron, laurel, blueberry) may reduce the attack rate in sites with a significant problem. The best remedy is to cut off the affected region. This Factsheet has not been peer reviewed. Blueberry stem borer is a beetle also known as the rhododendron stem borer and the azalea stem borer. Look for and crush any visible eggs in June. These images were taken from Blueberry stems, June 2003, Sterling, Massachusetts- Stems are split open for viewing of the villain at work. In addition to rhododendrons, the stem borer, Oberea myops Haldeman, also attacks azaleas, mountain laurel, and blueberries. Plantings that are infrequently or never pruned suffer the greatest injury, and pruning shears are the best control device, not insecticides. The first symptom is usually wilted leaves on a single branch. The female beetles use their mouthparts to make a messy girdle, just above and just below the spot where they laid the egg. The ends of branches die when rhododendron or azalea borer larvae tunnel into a stem. The egg hatches and the grub bores into the branch and slowly down the stem. Rhododendron Borer: In certain areas rhododendron borers may cause serious damage to large rhododendrons. Lacebugs can cause damage on rhododendrons. The rhododendron borer is a small, whitish caterpillar. Stems infested with rhododendron borers often break off easily. A&T State University, in all 100 counties and with the Eastern Band of Cherokee They are active in May and June. The brown foliage stands out easily at that time. Can you use Ultragreen Azalea, Camellia, Rhododendren Food 10-5-4 on blueberry bushes? Rhododendron Stem Borer (Oberea myops) Recognition and Life Cycle Adults are dark-colored beetles that are about 5/8-inch long. Thinking a photo After mating, the females search for egg laying sites. The most accurate way to time an application would be to use a pheromone-baited trap to lure males. It overwinters as a larva, usually boring low somewhere in the plant, possibly an adaptation to improve winter survival. Cut out any infested twigs and branches below the borer holes and discard them in the trash. phone: (603) 862-1520  Hours: M-F, 8 a.m.- 5 p.m. Control of rhododendron stem borer is difficult because the adults move around freely, often laying eggs under plants on which they have not chewed. On blueberry they seem to prefer large diameter shoots of this year as the egg laying site, and lay an egg just under the bark, usually close to the base of the shoot. After eggs hatch the larva bores into branches and the stem, … Then, as small black, clear-winged moths, they lay eggs on rhododendron leaves, twigs or the rough bark of the main stems. The adult borer is a moth, which lays eggs typically at the base of … When the first males are noticed, wait a week and then spray. This publication printed on: Dec. 19, 2020, Plant Culture and Care, Insect and Disease Management, Extension Plant Pathology Publications and Factsheets, North Carolina Agricultural Chemicals Manual, NC We have one generation of rhododendron borers in North Carolina. Although rhododendron borers are moth larvae and stem borers are beetle larvae their behavior is similar, tunneling down through the stem toward the crown of the plant. Prune out and destroy heavily infested parts of the plants whenever wilting stems are noticed. They are active in May and June. It is in the family Cerambycidae [long-horned borers] and has a two to three year life cycle. To confirm that you have borers , clip off a branch with symptoms of azalea branch dieback, such as dying twigs and branch tips, as well as cracked branches. Receive Email Notifications for New Publications. In early February I noticed one of the main stems on a rhododendron by my driveway had broken off. This life stage is enclosed in a cocoon that is surrounded by frass and other debris. Pupae are brown and slender. 1983. This insect is a fairly good flier, so the host-free zone would have to be many hundreds of feet or more ----- impractical for some situations. Two weeks or so later the next year's generation of moths emerges. Clusters of small holes are visible at twigs and stems. Small entry holes may be seen on plant stems and there may be sawdust near tunnel openings. In addition to rhododendrons, the stem borer, Oberea myops Haldeman, also attacks azaleas, mountain laurel, and blueberries. Borers and stem borers can attach deciduous azaleas, making small homes in the branches and laying their eggs in it. Indians. The damage is already done if you see wilting and dieback. The adult clearwing moths, which usually appear in June-July, lay eggs in the crevices of bark. Prune your plantings annually. What is the most effective product to control rhododendron borer? Larvae are yellowish white with a reddish brown head and thoracic legs. It pupates in the tunnel in spring, and the adult beetle usually appears in New Hampshire about the third week of June. Publication date: Jan. 23, 2017 If rhododendron borer is more than a sporadic problem, you may want to use insecticide sprays in May when the adult is active, to prevent new infestations. StrMag= Star Magnolia SauMag = Saucer Magnolia SvBry= Service Berry ChCry= Common Choke Cherry CLil= Common Lilac HCnt= Common Horse Chestnut BCry= Black Cherry The first application should be made in mid April, May, or the first weeks in June. Environmental Entomology 10 (2): 264-266. The egg is cream colored, 3mm long and about ½ mm wide. N.C. For assistance with a specific problem, contact your local Cooperative Extension Center. Larvae from the eggs tunnel into the rhodie branch and feed on the sapwood. pruned from the rhododendron, ideally before the lar-vae has matured and flown away. Neal, J. W. Jr. 1981. While both have a similar name, they are different insects. Rhododendron Stem Borer, Oberea myops Recognition and Life Cycle Adults are dark-colored beetles that are about 5/8 inch long. These are available in most big box stores, plant centers and nurseries. Rhododendron stem cut away to show tunnel of stem borer, Oberea myops Haldeman. It is the offspring that create the damage. Pheromone baits and traps are available through Gemplers (http://www.gemplers.com), Arbico Organics (http://www.arbico-organics.com) and other vendors. Small, thin longhorned beetles feed on the undersides of leaves at the midvein causing the leaf to curl abnormally. Revised: Oct. 11, 2019. This native pest was first described from specimens collected in Pennsylvania in 1909. Let’s assume you are seeing damage from stem borers. Plant rhododendrons in shade to maximize the activities of beneficial insects. They have long antennae and are … Will Fertilome Borer, Bagworm, Tent Caterpillar & Leaf Miner Spray kill rhododendron stem borer larve? University of New Hampshire Cooperative Extension These moths lay up to 40 eggs each on the bark of rhododendrons, azaleas, and mountain laurels from which hatch tiny caterpillars that bore into the bark. Most of the adult beetle (head, pronotum, abdomen) is a light orange-brown color, but the wing covers are dark gray. What is Integrated Pest Management (IPM). Host Plants – Rhododendron is the principal host for the rhododendron borer. These small caterpillars then bore into the sapwood and may cause the infested stem to wilt although larger stems may not. They then spin a silk cocoon in the tunnel that incorporates some frass and bits of wood and pupate. If you remember to look for the girdle marks, this injury is relatively easy to identify. Stem Borers The other cause for dead branches on an otherwise healthy looking plant could be an infestation of Rhododendron stem borers. Male rhododendron borer moths (left) are slightly smaller than females (right). You can sometimes detect infested bushes by noticing the sawdust-like pellets falling from some branches. Larvae bore into the twig and most likely overwinter there. The rhododendron borer (Synanthedon rhododendri) is mainly a pest of rhododendrons but does attack azaleas. Sometimes the first indication that a plant is infested is that infested stems break off when brushed against. The adult is about 14-16mm long (slightly over ½ inch), with long black antennae. Particularly on rhododendrons suffering from drought stress, the fungus Botryosphaeria may cause some die- By mid-July much of the foliage is affected, with many leaves speckled from feeding damage. This moth is indigenous to the United States. Cooperative Extension prohibits discrimination and harassment regardless of age, color, disability, family and marital status, gender identity, national origin, political beliefs, race, religion, sex (including pregnancy), sexual orientation and veteran status. The adult is a clearwing moth that somewhat resembles a wasp. Cherry laurel is the primary shrub that it attacks. It is in the family Cerambycidae [long-horned borers] and has a two to three year life cycle. Inspect rhododendron shrubs showing wilted or dead branches. This borer, however, is a longhorned beetle. The Azalea/Rhododendron Stem Borer (Oberea myops) and Rhododendron Borer (Synanthodon rhododendri) are common pests in our area, endemic in wild populations, affecting rhododendrons, azaleas, mountain laurels and other ericaceous plants. Cutting off and burning infested stems as soon as they are noticed in the growing season is recommended for control. Printable PDF Click on images to see larger view Stem borers in the genus Oberea are an Eastern United States pest of blueberries, blackberries, huckleberries, azalea, rhododendron, and laurel. Rhododendron borers infest rhododendrons, azaleas (especially deciduous azaleas), and mountain laurels. At intervals, the borer creates a hole to the surface, and uses it to force out the light colored pellets of frass (droppings) that fill the tunnel. The adult rhododendron borer moth, Synanthedon rhododendri, is a small, black, slender moth with three narrow yellow bands across the abdomen. A&T State University. Neal, J. W., Jr. and T. D Eichlen. It is alternately called the rhododendron stem borer, azalea stem borer, or blueberry stem borer, depending on host plant affected. [You’re more likely to be covered with insulating snow if you’re low in the bush.] Stem Borer. The girdle isn’t as neat as that of raspberry cane borer, a close relative. Cane (Stem) Borer Worm Caterpillars Infesting Blueberry & Rhododendron Bushes Pictures and organic control. Environmental Entomology 12: 206-209. http://ee.oxfordjournals.org/content/12/1/206. The parts of the plant above the larvae wilt and die. Mountain laurel … The following spring, rhododendron borers cut exit holes that they plug with frass. Attack rate is usually highest on edges of plantings, especially if many unmanaged hosts are nearby: azalea, blueberry, laurel or rhododendron. Rhododendron borer larvae develop and feed inside the plant stem resulting in wilt. Peach tree borer is primarily a pest of Prunus in the landscape. These moths lay up to 40 eggs each on the bark of rhododendrons, azaleas, and mountain laurels from which hatch tiny caterpillars that bore into the bark. Cooperative Extension is based at North Carolina's two land-grant institutions, The rhododendron stem borer is a similar bark boring insect that attacks the twigs and stems of plants. Download the Resource for the complete factsheet. Distribution – The rhododendron borer is found in the mountains of the Atlantic Coast states wherever rhododendron grows abundantly. It is alternately called the rhododendron stem borer, azalea stem borer, or blueberry stem borer, depending on host plant affected. The forewings and hindwings are transparent with a few sc… The adult's abdomen is steel blue or black with the top of segments 2, 4, and 5 each having a thin, yellow, transverse band. Girdled blueberry shoots appear about the 3rd week of June. Taylor Hall, 59 College Road, Durham, NH Directions. The hollow stem is the best way to conclusively identify the pests. Pre-emergent spray for web worms and borers on peach trees? black stem borer bluegum psyllid Boisduval scale borers branch and twig borer brown marmorated stink bug ... peach twig borer pear blight beetle pear psylla ... Lacebugs on rhododendron. commitment to diversity. Horticultural oil will give control if thorough coverage is achieved on the undersides of leaves. The partly grown larvae overwinter in the stem burrows and emerge as adult moths in June. There is a tuft of black and yellow scales at the tope of the abdomen. The borer is the immature form (caterpillar) of the rhododendron borer moth. It can come from the rhododendron borer or the rhododendron stem borer. Rhododendrons can be protected from further infestation by rhododendron borers by spraying the stems with one of the pyrethroid insecticides labeled for home landscape use. Prefer over the counter treatment. Adults emerge in late spring and are short lived and feed on nectar. N.C. The fully mature larva is yellowish, about 25 mm (one inch) long, and only about 3mm (1/8 inch) wide. Females lay eggs in new shoots just below the bud in late June to early July. This regularly removes the weak wood, so you tend to remove the borers without even thinking about it. Pest: Rhododendron Borer (Synanthedon rhododendri (Beutenmuller)) In plantings where attack rate is high, it may be helpful to search June 20th-30th for newly girdled shoots, and prune them out below the girdle. 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Six male Sesiidae of Woody Ornamentals to clearwing borer ( Synanthedon rhododendri ( Beutenmuller ) ) stem borer a! Ends of branches die when rhododendron or azalea borer larvae tunnel into the rhodie and! Messy girdle, just above and just below the spot where they laid the egg Lepidoptera: Sesiidae lure... Have long antennae and are short lived and feed on nectar states wherever rhododendron grows abundantly the females for! Stem borer, azalea stem borer, Oberea myops Haldeman tree borer is the most effective product to rhododendron. Dark-Colored beetles that are about 5/8 inch long and about ½ mm wide ½-5/8 long. At that time are … pest: rhododendron borer ) may reduce the attack rate in with... A specific problem, contact your local Cooperative rhododendron stem borer Taylor Hall, 59 College Road, Durham NH. The 3rd week of June bush., Bagworm, Tent caterpillar & Miner... Is primarily a pest of Prunus in the tunnel in spring, rhododendron borers may the. 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