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Hemlock
Bagworm: Formulations of acephate, azadirachtin, Bacillus thuringiensis, bifenthrin (Bifenthrin Pro Multi-Insecticide, Onyx Insecticide, Talstar F, Talstar Lawn & Tree Flowable, Talstar GC Flowable, Talstar Nursery Flowable, and TalstarOne Multi-Insecticide only), carbaryl, chlorpyrifos (Dursban 50W only), cryolite, cyfluthrin, cyfluthrin and imidacloprid, deltamethrin, diflubenzuron, lambda-cyhalothrin, malathion, permethrin, pyrethrins and piperonyl butoxide, spinosad, tau-fluvalinate, tebufenozide, and trichlorfon are labeled for bagworm management.
Management Hints: Bagworm cases (containing overwintering eggs) can be hand-picked from infested host plants during winter and early spring. Otherwise, management measures can be applied after eggs hatch and caterpillars are small during early to mid-June. (p. 176)
Black Vine Weevil (Taxus weevil): Formulations of acephate, azadirachtin, Beauveria bassiana, bifenthrin (Bifenthrin Pro Multi-Insecticide, Onyx Insecticide, Talstar F, Talstar Lawn & Tree Flowable, Talstar GC Flowable, Talstar Nursery Flowable, and TalstarOne Multi-Insecticide only), chlorpyrifos (Dursban 50W only), cyfluthrin (Tempo SC Ultra, Tempo Ultra WP, and Tempo Ultra WSP only), cyfluthrin and imidacloprid, fenpropathrin, lambda-cyhalothrin, permethrin (Astro Insecticide and Permethrin Pro only), pyrethrins and piperonyl butoxide, and tau-fluvalinate are labeled to manage adults. Furadan 4F is labeled to be applied as a soil drench (container-grown nursery stock only). Marathon 1% G and Marathon 60 WP are labeled for use only on plants grown in containers, flats, benches, or beds. Merit 2.5 G is labeled for use on ornamental shrubs and small trees in outdoor landscapes and interior plantscapes against black vine weevil larvae in soil. Merit 2, Merit 75 WP, and Merit 75 WSP are labeled for black vine weevil larvae and are for use only in and around industrial and commercial buildings and residential areas. Talstar Nursery Granular is labeled for soil incorporation into potting media used in containerized plantings of ornamental trees, shrubs, plants, flowers, conifers, and Christmas trees. The use of insect-parasitic nematodes applied as soil drenches in container-grown plant material may be effective in reducing larval populations of this pest. Follow label directions for all methods of application.
Management Hints: Spray foliage and surface to manage adults in May and June. Soil drenches can be applied from July to mid-October. Follow all label directions. (p. 240)
Cryptomeria Scale: Crawlers may be managed with formulations of acephate, azadirachtin (Ornazin 3% EC only), buprofezin, carbaryl, chlorpyrifos (Dursban 50W only), cyfluthrin, cyfluthrin and imidacloprid, deltamethrin, dimethoate, dinotefuran, horticultural oil, hydrophobic extract of neem oil, insecticidal soap, lambda-cyhalothrin (Battle GC, Demand CS, Scimitar CS, Scimitar GC, and Scimitar WP only), and methidathion.
Management Hints: Select and apply horticultural spray oil according to label directions. Yellow crawlers may begin to emerge from eggs in early June. Treat the crawler stage during June and in September. (p. 110)
Elongate Hemlock Scale: Crawlers may be managed with formulations of acephate, azadirachtin (Ornazin 3% EC only), buprofezin, carbaryl, chlorpyrifos (Dursban 50W only), cyfluthrin, cyfluthrin and imidacloprid, deltamethrin, dimethoate, dinotefuran, horticultural oil, hydrophobic extract of neem oil, insecticidal soap, lambda-cyhalothrin (Battle GC, Demand CS, Scimitar CS, Scimitar GC, and Scimitar WP only), and methidathion.
Management Hints: Select and apply horticultural spray oils according to label directions. Crawlers may be managed from late May through early June. Egg laying and crawler activity occur throughout the growing season. Crawler sprays made need to be applied at 7- to 10-day periods from mid-May to mid-September if an infestation is severe. (p. 104)
Hemlock Looper: Formulations of Bacillus thuringiensis (DiPel DF, DiPel ES, DiPel Pro DF, and formulations of Foray), bifenthrin (Bifenthrin Pro Multi-Insecticide, Onyx Insecticide, Talstar F, Talstar Lawn & Tree Flowable, Talstar GC Flowable, Talstar Nursery Flowable, and TalstarOne Multi-Insecticide only), cryolite, cyfluthrin, deltamethrin, diflubenzuron, lambda-cyhalothrin (Battle GC, Demand CS, Scimitar CS, Scimitar GC, and Scimitar WP only), permethrin (Astro Insecticide and Permethrin Pro only), pyrethrins and piperonyl butoxide, tau-fluvalinate, and tebufenozide are labeled for management of this pest.
Management Hints: Manage caterpillars from late May through early June. The larvae feed on needles from the top of the tree downward, dropping on a silk thread when disturbed. (p. 24)
Hemlock Rust Mite (eriophyid): Formulations of abamectin, carbaryl, dimethoate, horticultural oil, insecticidal soap (MPede only), spiromesifen, and tau-fluvalinate are labeled to manage eriophyid mites.
Management Hints: Manage mites in late March through April before they cause significant damage. This pest frequently goes unnoticed. If foliage looks suspicious, place it under a stereomicroscope to observe these very small mites. (p. 122)
Hemlock Scale: Crawlers may be managed with formulations of acephate, azadirachtin (Ornazin 3% EC only), buprofezin, carbaryl, chlorpyrifos (Dursban 50W only), cyfluthrin, cyfluthrin and imidacloprid, deltamethrin, dimethoate, dinotefuran, horticultural oil, hydrophobic extract of neem oil, insecticidal soap, lambda-cyhalothrin (Battle GC, Demand CS, Scimitar CS, Scimitar GC, and Scimitar WP only), and methidathion.
Management Hints: Select and apply horticultural spray oil according to label directions. First generation crawler treatments should be made in June and early July. Application of sprays directed against second-generation crawlers should be made during early August through September. Repeat applications may be needed. (p. 102)
Hemlock Woolly Adelgid: Horticultural spray oil may be applied as a dormant treatment. Formulations of acetamiprid, bifenthrin (Bifenthrin Pro Multi-Insecticide, Talstar F, Talstar Lawn & Tree Flowable, and TalstarOne Multi-Insecticide only), chlorpyrifos (Dursban 50W only), cyfluthrin and imidacloprid, deltamethrin, horticultural oil, imidacloprid, insecticidal soap, oxydemeton-methyl, tau-fluvalinate, and thiamethoxam are labeled for management of this key pest. Marathon 1% G and Marathon 60 WP are labeled for use only in plants grown in containers, flats, benches, or beds.
Management Hints: Apply horticultural spray oil according to label directions. Adelgids may be managed by applying registered insecticides from mid- to late June and in late September through October. (pp. 78, 80)
Nuculaspis pseudomeyeri (an armored scale insect): Crawler treatments include acephate, azadirachtin (Ornazin 3% EC only), buprofezin, carbaryl, chlorpyrifos (Dursban 50W only), cyfluthrin, cyfluthrin and imidacloprid, deltamethrin, dimethoate, dinotefuran, horticultural oil, hydrophobic extract of neem oil, insecticidal soap, lambda-cyhalothrin (Battle GC, Demand CS, Scimitar CS, Scimitar GC, and Scimitar WP only), malathion, and methidathion.
Management Hints: Select and apply horticultural spray oils according to label directions. Crawler treatments should be applied when eggs hatch in May for the first generation and in late July through August for the second generation. Repeat applications may be needed.
Spruce Spider Mite: Horticultural spray oil can be applied as a dormant treatment. Motile mite stages can be managed with formulations of abamectin, bifenazate, bifenthrin (Bifenthrin Pro Multi-Insecticide, Onyx Insecticide, Talstar F, Talstar Lawn & Tree Flowable, Talstar GC Flowable, Talstar Nursery Flowable, and TalstarOne Multi-Insecticide only), chlorpyrifos (Dursban 50W only), deltamethrin (5SC only), dicofol, dimethoate, disulfoton, etoxazole, fenbutatin-oxide, fenpyroximate, hexythiazox, horticultural oil, hydrophobic extract of neem oil, insecticidal soap, lambda-cyhalothrin (Battle GC, Demand CS, Scimitar CS, Scimitar GC, and Scimitar WP only), malathion, oxydemeton-methyl, spinosad, spiromesifen, and tau-fluvalinate.
Management Hints: Apply horticultural spray oils according to label directions. Other materials can be used to manage motile stages when they first appear. Repeat applications may be necessary; hence, follow label directions. Populations frequently are heavy from May through June and September. (p. 118)