Elementary entomology ([c1912]) Elementary entomology . elementaryentomo00sand Year: [c1912] FIG. 174. The pear psylla. (Greatly enlarged, in different proportions) a, adult; b, full-grown nymph from above ; c, egg. (After Slingerland) which covers the foliage and bark, on which grows a sooty black fungus which is a good indication of the presence of the pest. The plant-lice, or aphides (Aphididae), are the most abundant and possibly the most destructive family of all the Hemiptera. Florists commonly call them green-flies, which term may refer to several species. Usually they are not over a t
Elementary entomology ([c1912]) Elementary entomology . elementaryentomo00sand Year: [c1912] FIG. 174. The pear psylla. (Greatly enlarged, in different proportions) a, adult; b, full-grown nymph from above ; c, egg. (After Slingerland) which covers the foliage and bark, on which grows a sooty black fungus which is a good indication of the presence of the pest. The plant-lice, or aphides (Aphididae), are the most abundant and possibly the most destructive family of all the Hemiptera. Florists commonly call them green-flies, which term may refer to several species. Usually they are not over a tenth of an inch long, and the wingless forms are more or less pear-shaped, with long legs and antennae, and the common forms have two tubes projecting from the abdomen, called honev-tubes. The vast amount of j injury done by them is chiefly due to their remarkably rapid power of reproduction. During the summer the females will give birth to from fifty to seventy-five young during a week or two, which will become full grown in from one to two weeks. All of these
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