. Elementary entomology . Fig. 176. Apple aphis, last stage nymphs of winged females on undersurface of apple leaf migrate to and from the summer food plants to others upon which they feed in fall and spring, and upon which the winter eggs are deposited. Many plant-lice exude an abundance of a sweet liquid

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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912