. Annual report of the Commissioner of Agriculture ... Agriculture -- New York (State). 816 Popular Editions of Station Bulletins of the. The grape leaf-hopper is about one-eighth of an The inch long, light yellow during the summer, but insect. changing to salmon color toward fall and becoming dark red in its winter hiding place. One of the adults is shown on page 819 and five iiymphal stages or " instars" in the adjoining figures. These differ from each other mainly in the in- creasing prominence of the wing pads; since the hoppers do not pass through larval, pupal and adult forms w
. Annual report of the Commissioner of Agriculture ... Agriculture -- New York (State). 816 Popular Editions of Station Bulletins of the. The grape leaf-hopper is about one-eighth of an The inch long, light yellow during the summer, but insect. changing to salmon color toward fall and becoming dark red in its winter hiding place. One of the adults is shown on page 819 and five iiymphal stages or " instars" in the adjoining figures. These differ from each other mainly in the in- creasing prominence of the wing pads; since the hoppers do not pass through larval, pupal and adult forms which differs so markedly in most in- sects. The adult hoppers have a front, or outer, pair of wing shields, or " elytra", which close along the back, making a tight, tent-like cover beneath which the thin, filmy, true Fig. 1—First Four Ntmphal Instars of wings are concealed when the Grape Leaf-Hopper. • , . ' n- •> . (Enlarged.) lusccts are not m night. The protection given the little pests by these resistant wing covers makes it very difficult to injure the adults by spraying, since the ordinary mist spray does not reach any tender part of the body. Both old and young " thrips " are still further protected by their habit of feeding on the under side of the leaves, so that, to combat them successfully, driving sprays must be used that catch them from below and drench them thoroughly. The adult hoppers winter in protected Fig. 2—Fifth Ntmphal In- places about the vineyards, weeds, piles of '^^" ''hS'per^ ^''^^' rubbish, ditch banks or other neglected (Enlarged.) corners of the vineyards themselves or woodland, undergrowth or grass lands adjoining them. They appear before the grape foliage has started and feed for a time on early spring weeds or other. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly res
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Keywords: ., bookauthornewyorkstateagricultu, bookcentury1800, bookdecade1890
