Deay, H.O., & Ulman, P.T. 1948 DDT as a summer spray against European elm scale.. Journal of Economic Entomology 41: 506.
Notes: Results indicate success with one application of a spray containing 0.5% of actual DDT applied in July.
Deay, H.O., & Ulman, P.T. 1948 DDT as a summer spray against European elm scale.. Journal of Economic Entomology 41: 506.
Notes: Results indicate success with one application of a spray containing 0.5% of actual DDT applied in July.