Abstract
Spring and summer field insecticide applications were made to Compare the effectiveness of selected chlorinated hydrocarbon and organie phosphate insecticides in control of the European pine shoot moth. Control obtained with spring applications of dimethoate, DDT, and Phosdrin® (l-methoxycarbony-1-propen -2-yl dimethyl phosphate) confirmed earlier success with these materials. Guthion® ( O,O -dimethyl S -(4-oxo-1,2,3-benzotriazin- 3-(4 H )-ylmethyl phosphorodithioate); methoxychlor; and Bayer 22408 ( O,O -diethyl O -naphthalimido phosphorothioate) also showed promise. Evidence that resumption of spring feeding and larval migration may be protracted by weather in a given year suggests that timing of the spring insecticide application should coincide with initial pitch blister (tent) formation. Results of Sevin® (1-naphthyl- N -methylcarbamate), DDT, and dimethoate applications made seven times between the period of 60% adult emergence and the date when 90% of the eggs had hatched (summer) give evidence that treatment should be deferred until at least 50% of the eggs have hatched. Evidence showing that larvae always feed first in the needles and then in the buds of the tree points up the desirability of having a maximum amount of insecticidal residue present at this time.
Published Version
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