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Crabapple (ornamental nonedible flowering)
Aphids: Apply horticultural spray oil as a dormant treatment. Formulations of abamectin, acephate, acetamiprid, 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, cyfluthrin and imidacloprid, deltamethrin, dinotefuran, disulfoton, fenpropathrin, horticultural oil, hydrophobic extract of neem oil, imidacloprid, lambda-cyhalothrin (Battle GC, Demand CS, Scimitar CS, Scimitar GC, and Scimitar WP only), malathion, naled, oxydemeton-methyl, permethrin (Astro Insecticide and Permethrin Pro only), pymetrozine, pyrethrins and piperonyl butoxide, pyriproxyfen, tau-fluvalinate, and thiamethoxam are labeled for management of aphids. Marathon 1% G and Marathon 60 WP are labeled for use only on plants grown in containers, flats, benches, or beds.
Management Hints: Select and apply horticultural spray oil according to label directions. Treat when aphids are present. Do not apply acephate more than three times in a growing season at a 4-week interval. Phytotoxicity has occurred from acephate on the following crabapple varieties: Hopa, Ichonoski, Malusfloribunda , Pink Perfection, Red Wine, and Snow Cloud. (p. 300)
Cankerworm: Formulations of 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 (Battle GC, Demand CS, Scimitar CS, Scimitar GC, and Scimitar WP only), naled, permethrin (Astro Insecticide and Permethrin Pro only), phosmet (spring cankerworm only), pyrethrins and piperonyl butoxide, spinosad, tau-fluvalinate, and tebufenozide (fall cankerworm only) are labeled for cankerworm management.
Management Hints: Apply in May after leaves have formed, but only if caterpillars are present. (pp. 142, 144)
Eastern Tent Caterpillar: 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, insecticidal soap, lambda-cyhalothrin, malathion, naled, permethrin (Astro Insecticide and Permethrin Pro only), phosmet, pyrethrins and piperonyl butoxide, spinosad, tau-fluvalinate, and tebufenozide are labeled for tent caterpillar management.
Management Hints: Spray areas around web when first noticed in April and May. Do not apply acephate more often than three times in a growing season at a 4-week interval. Phytotoxicity has occurred from acephate on the following crabapple varieties: Hopa, Ichonoski, Malusfloribunda , Pink Perfection, Red Wine, and Snow Cloud. Prune viable egg masses from small twigs during the winter. (p. 168)
Fall Webworm: Formulations of 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, difl ubenzuron, lambda-cyhalothrin, naled, permethrin (Astro Insecticide and Permethrin Pro only), pyrethrins and piperonyl butoxide, spinosad, tau-fluvalinate, tebufenozide, and trichlorfon are registered for webworm management.
Management Hints: Treat when webs are small in late June through July. (p. 166)
Flatheaded Appletree Borer: Formulations of bifenthrin (Onyx Insecticide only), chlorpyrifos (Dursban 50W only), and permethrin (Astro Insecticide and Permethrin Pro only) are labeled for borer management.
Management Hints: Fertilization and irrigation will promote a healthy plant and reduce successful attacks by this pest. Treat trunks in early June, July, and August. Be sure to follow label directions for repeat applications. (p. 270)
Gypsy Moth: Refer to Gypsy Moth. Prior to applying any control material, read individual labels for host plant clearance information. (pp. 138, 140)
Japanese Beetle: Formulations of acetamiprid, azadirachtin, 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), cyfluthrin, cyfluthrin and imidacloprid, deltamethrin, dinotefuran, fenpropathrin, imidacloprid, lambda-cyhalothrin, malathion, permethrin (Astro Insecticide and Permethrin Pro only), phosmet, and pyrethrins and piperonyl butoxide are labeled to manage adults. Formulations of imidacloprid (Merit 2, Merit 75 WP, and Merit 75 WSP) are also labeled for management of white grub larvae such as Japanese beetle, chafers, Oriental beetle, Asiatic garden beetle, and Phyllophaga spp. 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 Japanese beetle adults.
Management Hints: Treat when adults are first observed from late June through July. (p. 236)
Leafroller: 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, deltamethrin, lambda-cyhalothrin, naled, permethrin (Astro Insecticide and Permethrin Pro only), pyrethrins and piperonyl butoxide, and spinosad are labeled for leafroller management.
Management Hints: Products should be applied before leaves are tightly rolled in the spring. Do not apply acephate more often than three times in a growing season at a 4-week interval. Phytotoxicity has occurred from acephate on the following crabapple varieties: Hopa, Ichonoski, Malusfloribunda , Pink Perfection, Red Wine, and Snow Cloud. (pp. 172, 214)
Mites: Apply horticultural spray oil as a dormant treatment. Formulations of abamectin, 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, disulfoton, horticultural oil, hydrophobic extract of neem oil, insecticidal soap, lambda-cyhalothrin, malathion, oxydemeton-methyl, spinosad, spiromesifen, and tau-fluvalinate are labeled for mite management.
Management Hints: Select and apply horticultural spray oil according to label directions. Apply registered insecticides when mites are fi rst seen in the spring. Repeat applications may be needed. Be sure to follow label directions. (p. 482)
Pear Sawfly: Formulations of azadirachtin, carbaryl, chlorpyrifos (Dursban 50W only), cyfluthrin, cyfluthrin and imidacloprid, deltamethrin, difl ubenzuron, horticultural oil (larvae), imidacloprid (Merit 2, Merit 75 WP, and Merit 75 WSP only), insecticidal soap, lambda-cyhalothrin, naled, spinosad, and thiamethoxam are labeled for sawfly management.
Management Hints: Treat infested plants when larvae are present in early June and early August. (p. 130)
Roundheaded Appletree Borer: A formulation of chlorpyrifos (Dursban 50W only) is labeled for borer management.
Management Hints: Fertilization and irrigation will promote a healthy plant and reduce successful attack by this pest. Treat trunks in early June and early July. Repeat applications may be needed. Be sure to follow label directions for repeat applications. (p. 278)
Yellownecked Caterpillar:Formulations of azadirachtin, 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, 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, spinosad, and tau-fluvalinate are labeled for management of this pest.
Management Hints: Applications may be made from July through mid-September when larvae are present and infestations are severe. Buds are usually set on host plants late in the growing season so that lowering population levels will be more aesthetic in nature than for plant health care reasons. Remove and destroy colonies of young larvae when observed on the foliage of trees. (p. 154)