Michelbacher, A.E., Swanson, C., & Middlekauss, W.W. 1946 Increase in the population of Lecanium pruinosum on English walnuts following application of DDT sprays.. Journal of Economic Entomology 39(6): 812-813.

Notes: An attempt to control the codling moth on walnut with DDT has led to increases in population of L. pruinosum.