-61 
1948 
Wason, E. J., and Lloyd, N. C. (309) 
Insect pests. DDT and codling moth control. Agr. Gaz. N. S. 
Wales 59: 538-540. 
Applications of DDT after mid-December are undesirable if 
the woolly apple aphid is present, because Aphelinus mali does 
not become active until after late in December, and early use 
of DDT allows the parasite to build up to insure effective woolly 
apple aphid control in the fall. Recommends saving prunings 
from several parasitized aphid-infested trees when dormant 
oil sprays are to be applied. 
1950 
Newcomer, E. J. (310) 
Orchard insects of the Pacific Northwest and their control. U. S. 
Dept. Agr. Cir. 270: 17, 18, and 55. Revised. 
Substantially the same as reference 275. 
■fr U. S. GOVERNMENT PRINTING OFFICE : O — 1953 
