The Peach Cottony Scale

The resistance of the peach cottony scale ( Pulvinaria amygdali ? ) to common sulfide sprays prompted efforts to determine the susceptibility of the insect to oil sprays. Tests demonstrated the possibility of securing satisfactory commercial control with various oil preparations applied in the spring as the buds were swelling as well as with midsummer applications of “white oil emulsions” directed against “crawlers” and young scales. It is noted that plantings receiving either two or three treatments with “white oil emulsions” for two successive years have so far shown no indications of injury to the health of the trees.