A specially formulated soap spray was effective for removal of Aphis gossypii Glover and A. spiraecola Patch on highway plantings of Pyracantha in California. Water alone produced a removal rate of 46–47% for both species, and a general pattern of increased removal rate with higher concentrations of the soap solution was noted. The maximum soap concentration tested, 0.1%, produced removal rates of 72 and 79% for A. spiraecola and A. gossypii, respectively.
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Pinnock et al. (1974) studied this question.