Edith Marion Patch

"White masses looking like patches thick mold often occur on , especially about pruning wounds or other scars the trunk and branches and upon s. Beneath this substance are colonies of rusty colored or purplish brown plantlice known as "wooly aphids" on account of the appearance of white covering which is, however, really composed of waxen filaments. The species is common in Maine on , , and and some other ."

"Only two species of s of world-wide distribution are at present known which commonly attack the in numbers sufficient to cause serious injury directly due to their feeding operations. These are are the "potato aphid" (' ) and the "green peach aphid" or "spinach aphid" (' ). A third species, apparently also of world-wide distribution, is often present on the potato, frequenting especially the underside of the lower leaves. This is the "buckthorn aphid" (' Patch); which may, under certain conditions, sometimes cause infestations of a serious nature. All three of these species have been proved to be capable of spreading certain s under experimental conditions; and there can be no logical doubt that they function in the same way in the field. Wherever potatoes are grown for seed purposes these three species of aphids may need to be reckoned with."

"In Maine the s deposit their over-wintering eggs on the common garden foxglove (' L.). Egg-laying in this locality begins late in September and extends through October the time varying somewhat with different weather conditions. The eggs hatch in the spring and the aphids of the first generation, wingless forms called "stem-mothers", seek shelter between the folded parts of the growing leaves. The stem-mothers are slow in their development and are about a month in attaining full growth. On reaching maturity they do not lay eggs but produce their young viviparously."