| Abstrakt: |
In field tests during 1957 and 1958 for control of the Nantucket pine moth, Rhyacionia frustrana (Comst.), and the European pine shoot moth, R. buoliana (Schiff.), it was found that emulsion formulations of Delnav®(2,3-p-dioxanedithiol S, Sbis(O, O-diethyl phosphorodithioate) (12 oz. actual), Guthion® (O,O-dimethyl S-( 4-oxo-1,2,8-benzotriazin-3(4H)- ylmethyl) phosphorodithioate (12 oz. actual), malathion (2 lbs. actual), methyl parathion (1 Ib. actual), and Trithion®(S-(p- chlorophenylthio) methyl O,O-diethyl phosphorodithioate) (12 oz. actual) gave control as good as or better than DDT (7 lbs. actual) when applied with a knapsack sprayer at a rate of 45 gallons of finished spray per acre. The effectiveness of control was based on a damage estimate obtained from counting all the infested and noninfested tips on treated and untreated cheek trees. |
