Abstract
Rhyacionia frustrana (Comstock) was accidentally introduced on Monterey pine into San Diego, San Bernardino, and Kern Counties, Calif., identification being based on genitalia, wing length, overwintering pupation site, and most probable geographic origin. Very good control was obtained with 4 annual sprays of Zectran® (4-[dimethylamino]-3,5-xylyl methylcarbamate), dimethoate, acephate, trichlorfon, or phosalone in 2 different seasons. One season’s trial of Imidan® (O, O-dimethyl phosphorodithioate S -ester with N -[mercaptamethyl]phthalimide) or chlorpyrifos sprays gave good control, whereas methoxychlor, diazinon, lindane, or malathion gave mediocre to poor control. One soil application of granular carbofuran or aldicarb gave good control, but granular acephate or disulfoton gave no control.
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