Thirumurugan, A., & Gautam, R.D. 2001 Relative toxicity of some insecticides to mealy bug, Planococcus pacificus (Pseudococcidae, Hemiptera).. Annals of Plant Protection Sciences 9(1): 135-136.

Notes: Nymphs and adults of Planococcus pacificus were sprayed with a series of concentrations of insecticides: chlorpyrifos and monocrotophos at 0.0009, 0.001, 0.005, 0.007 and 0.09%, phosalone at 0.009-0.03%, and endosulfan at 0.5-1.75%. The LC50 values for the insecticides were determined and the relative resistance of the mealybug to various insecticides in relation to its predatory bug (Scymnus brunnescens) was calculated by taking the ratio of respective LC50 values. The predators were more resistant to endosulfan than mealybugs.