Control of the Nantucket Pine Tip Moth on Lobolly Pine with Systemic Insecticides in Louisiana1

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Abstract
Young loblolly pines, Pinus laeda L., were used in 1960 and 1961 to test the effectiveness of certain systemic insecticides for control of the Nantucket pine tip moth, Rhyacionia frustrana (Comstock). The insecticides were applied by various methods, and rates and data were collected to determine bud infestation and phytotoxic effects resulting from the treatments. Loblolly pine seedlings survived well and were free of insect attack for 1 year following the coating of moistened roots with 5% disulfoton granules prior to planting. Phorate 44D and 3% dimethoate granules were highly phytotoxic to the seedlings. One-year-old pines received good protection during 1960 after treatment with either 21 g of 10% phorate or 42 g of 5% disulfoton granules per plant. Height growth of treated plants was no better than that of untreated plants. Ten percent phorate granules applied to 2-year-old pines at 42 and 84 g per plant gave effective control during the 1960 and early 1961 growing season. These 2 treatments also resulted in height growth that was significantly greater than growth of untreated plants. An appreciable reduction of infestation was obtained with a foliar spray of dimethoate applied at the rate of 0.25 lb toxicant per 100 gal of water. Successful attacks by first-generation larvae in 1961 were significantly reduced by rates of 0.5 and 1.0 lb of Bidrin® (3-hydroxy-N,N-dimethyl-cis-crotonamide dimethyl phosphate) per 100 gal of water. Trunk application experiments showed that Bidrin and phorate are readily absorbed through the bark and translocated by 2-year-old plant.

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