INFLUENCE OF OIL ON TOXICITY OF BENZENE HEXACHLORIDE

Abstract

In 1946, a water-dispersible powder (formulation P. 530) containing 6% gamma benzene hexachloride and 50% goulac (lignin pitch) was tested in the field for control of black cherry aphid (Myzus cerasi (F.)), apple aphid (Aphis pomi Deg.), mealy plum aphid (Hyalopterus arundinis (F.)), wooly apple aphid (Eriosoma lanigerum (Hausm.)) and pear psylla (Psylla pyricola Foerst.). The material was compared at 0.25 lb. gamma isomer per 100 gal. in (1) water alone, and (2) plus 0.5 gal. of either distillate oil (42. S.S.U. Vis. 100° F., 77% U.R.) or summer oil (60-64 S.S.U. Vis. 100° F., 78% U.R.). Three gallons of each mixture were applied by bucket pump and two trials were made, the first beginning July 10 and the second July 16. Results are given in Table 1.