Insects injurious to fruits . alkaline wash. ATTACKING THE LEAVES. No. 205.—The Imported Currant-worm. Neinahis ventricosus Klug. This is the larva of one of the saw-flies, and is jierhapsthe most troublesome of all the insects the currant-growerhas to encounter. It is aEuropean insect, first noticedin America in 1858, andwithin the comparativelybrief period which has sinceelapsed it has spread overa large portion of the conti-nent. This insect usuallypasses the winter in thepupal condition, but occa-sionally in the larval state. Very early in the springthe flies appear. The twosexes difi^er m
Insects injurious to fruits . alkaline wash. ATTACKING THE LEAVES. No. 205.—The Imported Currant-worm. Neinahis ventricosus Klug. This is the larva of one of the saw-flies, and is jierhapsthe most troublesome of all the insects the currant-growerhas to encounter. It is aEuropean insect, first noticedin America in 1858, andwithin the comparativelybrief period which has sinceelapsed it has spread overa large portion of the conti-nent. This insect usuallypasses the winter in thepupal condition, but occa-sionally in the larval state. Very early in the springthe flies appear. The twosexes difi^er materially in ap-pearance. In Fig. 352, a represents the male, and b thefemale, both enlarged, the lines at the side indicating theirnatural size. The male approaches the common house-flyin size, but the body is scarcely so robust, and the wings, fourin number, are more glossy. Its body is black, with a fewdull-yellow spots above, the under side of the abdomen beingyellowish and the legs bright yellow; the veins of the wings. 340 INSECTS INJURIOUS TO THE RED CURRANT. are black or brownish black. The female is larger than themale, and differs in the color of its body, being mostly yellowinstead of black. These flies are active only during thewarmer parts of the day; at other times they are quiet oralmost torpid. Within a few days the female deposits her eggs on theunder side of the leaves on the larger veins in rows, asshown in Fig. 353. When first laid, they are about one-thirtieth of an inch long,^ict. 353. jjy^ ^j^gy either absorb moisture from the leaf,or else the expansion isdue to the developmentof the enclosed larva, andwithin four or five daysthey increase in lengthto about one-twentiethof an inch, are roundedat each end, whitish andglossy. In about iandays the young larvahatches, and it is thenabout one-twelfth of aninch long, of a whitish color, with a large head, having adark, round spot on each side of it. At first they eat smallholes in the leaves, as shown at 2 an
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Keywords: ., bookcentury1900, bookdecade1900, bookidin, booksubjectinsectpests
