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

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