Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . Development of a Jassid, Agallia sanguinolenta.—a, larva; b, pupa; c, adult; also headof same from below. somewhat as in the grasshoppers, and like them the insects arepowerful leapers. This they are in all stages, but as adults theyare also ready fliers, and hence difiicult to capture. Many ofthem are common and, feeding on cultivated plants, are in other families, there is considerable difference in the lifehistory of the species ; but of most of those of econo
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . Development of a Jassid, Agallia sanguinolenta.—a, larva; b, pupa; c, adult; also headof same from below. somewhat as in the grasshoppers, and like them the insects arepowerful leapers. This they are in all stages, but as adults theyare also ready fliers, and hence difiicult to capture. Many ofthem are common and, feeding on cultivated plants, are in other families, there is considerable difference in the lifehistory of the species ; but of most of those of economic impor-tance it may be said that they pass the winter in the adult stage,hiding in all .sorts of rubbish or in crevices, wherever they findopportunity. Some time in spring they leave their winter quar-ters, attack the plants upon which they feed, and lay eggs. Thenumber of hibernating individuals is usually not very great, butthey lay a large number of eggs, and the young and future broodsbecome troublesome. One of the best-known species is that 148 AN ECONOMIC ENTOMOLOGY. Fig. The grape-Ieaf-hopper, Erythroneura vitis: at rest,and with wings expanded. found on grape-vines, which causes the leaves during the latterpart of the summer to become marked with brown spots, some-times in such numbers that they become confluent and the entireleaf is burnt. If we tap a leaf at this time swarms of littlecreatures, not exceeding an eighth of an inch in length, prettily marked with green, rosy-red, and yellow, will flyor jump from in the seasonthey are yellow or green-ish, without wings, butjump readily if roses we find a simi-lar appearance, and herethe species are green oryellowish, without muchmarking. Many are the crops infested by these little hoppers,and, though there are good characters by which they can bedistinguished scientifically, yet to ordinary observation theyappear much alike, except in size and color. The methods of preventing injury are much
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
