. Manual of fruit insects. Fig. 357. — Nymphs and molted nymph skins of thegrape leaf-hopper. Enlarged. GRAPE INSECTS 411. Fig. 358. — Fifthstage nymph of thegrape leaf-hopper. the season advances and more foliage appears, the hopperswork upward on the vines. They Hve almost entirely on theunder side of the leaves (Fig. 353), fromwhich they suck their food by means of theirsharp beaks. They are very active crea-tures, leaping or flying quickly when a leaf orvine is disturbed. The adults feed on the vine for two weeksor more before they begin to lay eggs. Thefemale hopper is provided with a sle
. Manual of fruit insects. Fig. 357. — Nymphs and molted nymph skins of thegrape leaf-hopper. Enlarged. GRAPE INSECTS 411. Fig. 358. — Fifthstage nymph of thegrape leaf-hopper. the season advances and more foliage appears, the hopperswork upward on the vines. They Hve almost entirely on theunder side of the leaves (Fig. 353), fromwhich they suck their food by means of theirsharp beaks. They are very active crea-tures, leaping or flying quickly when a leaf orvine is disturbed. The adults feed on the vine for two weeksor more before they begin to lay eggs. Thefemale hopper is provided with a slender andsharp ovipositor, by means of which she in-serts the eggs just beneath the lower skin ofthe leaf. The eggs are semitransparent,slightly bean-shaped, and about three hun-dredths of an inch in length and a third aswide (Fig. 356). Egg-laying continues for two months or more,and each female may deposit over a hundred eggs. In NewYork the first eggs are laid about the first of June in normal years and towards the middle ofthe month in backward greatest number of eggs areto be found in the leaves in
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1915
