Hassan, T.A. 1999 Joint action of certain insecticides on the California Red Scale Insect, Aonidiella aurantii (Mask).. Journal of Natural and Applied Sciences (University of Aden) 3(2): 23-29.

Notes: The joint action of certain insecticide compounds, summer oil (98% EC), diazinon (60% EC) and dimethoate (40% EC), were investigated in a field strain of California Red Scale Insect (CRS), Aonidiella aurantii, collected in Sana'a city, Yemen. The data revealed that high levels of synergism were obtained by mixing low concentrations together. This showed that in preparing binary insecticide mixtures, concentration-ratio relationships should be considered.