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| LIFE CYCLE:Life cycle:
eggs hatch in about one week at 78 F (26 C). Larvae
complete development in about 25 days. Complete life
cycle takes 5-6 weeks (78 F or 26 C) to 11 weeks (73 F or
23 C). Predominate damage is mid- to late summer. FEEDING SYMPTOMS: Feed along midrib, between veins. Will chew notches in the leaf blades, giving a ragged appearance. Infested turf appears to be severely scalped, with large yellowish or brown patches. |
MANAGEMENT:
Halofenozide (MACH 2)—an insect growth
regulator/molt accelerator—and spinosad (CONSERVE)
are effective chemical controls. Bt (Bacillus
thuringiensis) and neem (azadirachtin) may provide some
control of small larvae (do not irrigate). Avoid mowing
for at least 1-3 days after application of insecticides.
Apply in the afternoon and avoid irrigating over night.
Liquid sprays are more effective than granular
applications. Contact insecticides: acephate (ORTHENE),
azadirachtin (TURPLEX), chlorpyrifos (DURSBAN),
cyfluthrin (TEMPO), fluvalinate (MAVRIK, YARDEX),
isazofos (TRIUMPH), isofenphos (OFTANOL), trichlorfon
(DYLOX, PROXOL), tebufenozide (CONFIRM). Biorational
products: entomopathogenic nematodes (Steinernem
carpocapsae)--apply in early morning or late afternoon to
avoid heat or direct sunlight. Irrigate to moisten soil
and thatch; then again immediately after application,
before spray droplets dry. |
