Insects injurious to fruits . up, preserving their ranks withmuch regularity, as shown in Fig. 296. They begin at oneedge of the leaf and eat the whole of theleaf—including the ribs—to the stalk, andproceed from leaf to leaf down the branch,devouring as they go, until they are fullgrown. When mature, they measure aboutfive-eighths of an inch in length, are somewhatslender and tapering behind, and thickenedbefore the middle. They are of a pale-yellowcolor, darker or greenish on the back, withtwo transverse rows of minute black points across each ring,the head and tip of the last segment being b
Insects injurious to fruits . up, preserving their ranks withmuch regularity, as shown in Fig. 296. They begin at oneedge of the leaf and eat the whole of theleaf—including the ribs—to the stalk, andproceed from leaf to leaf down the branch,devouring as they go, until they are fullgrown. When mature, they measure aboutfive-eighths of an inch in length, are somewhatslender and tapering behind, and thickenedbefore the middle. They are of a pale-yellowcolor, darker or greenish on the back, withtwo transverse rows of minute black points across each ring,the head and tip of the last segment being black; the underside is yellowish. After the last moult the larvae becomeentirely yellow, when they leave the vines, descend to theground, and burrow under its surface. There they form ovalcells in the earth, which they line with silk, and within theseenclosures change to pupse, from which the perfect fliesescape in about a fortnight. The second brood pass thewinter in the pupal state. In Fig. 296 one of the oval Fig. 286 L\SECTS INJURIOUS TO THE OH APE Fig. 297. cells is sliowii with the fly resting on it; also one of thepupae. Occasionally this insect is very destructive, sometimes en-tirely stripping the vines. In such cases the foliage shouklbe sprinkled with hellebore and water, or Paris-green andwater, in the proportions given under No. 140. No. 157.—The Grape-vine Leaf-hopper. Erythroneura vitis {Harris). The accompanying figure, 297, represents the insect com-monly known among vine-growers as the Thrip. The insects are shownmagni tied ; theshorter lines adjoin-ing indicate theirnatural size. Thefigure to the leftshows the mature in-sect with its wingsexpanded, the otherthe same with its wings closed. It is rather more than one-eighth of an inch long, by two broad, blood-red bands,and a third dusky one at the apex, the anterior band occu-|)ving the base of the thorax and the base of the wing-covers,the middle one wide above, narrowing towards the marg
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Keywords: ., bookauthorsaunderswilliam183619, bookcentury1800, bookdecade1880
