. Insect pests of farm, garden and orchard . Fig 344.—The currant stem-girdler {Janus integer Norton): a, female atwork girdling a currant stem—natural size; b, girdled portion of stemmuch enlarged to show character of girdle; c, stem cut open to showegg; d, egg—much enlarged. (After Slingerland.) 480 INSECT PESTS OF FARM, GARDEN AND ORCHARD and Michigan, but has been most troublesome in New has also been noted as a pest of willow and poplar in Mary-land, and of basket willow in Kentucky, Indiana, and Ohio, sothat it is doubtless quite generally distributed. The adult insectis a slende
. Insect pests of farm, garden and orchard . Fig 344.—The currant stem-girdler {Janus integer Norton): a, female atwork girdling a currant stem—natural size; b, girdled portion of stemmuch enlarged to show character of girdle; c, stem cut open to showegg; d, egg—much enlarged. (After Slingerland.) 480 INSECT PESTS OF FARM, GARDEN AND ORCHARD and Michigan, but has been most troublesome in New has also been noted as a pest of willow and poplar in Mary-land, and of basket willow in Kentucky, Indiana, and Ohio, sothat it is doubtless quite generally distributed. The adult insectis a slender saw-fly with shining black body and light brownishlegs, shown natural size in Fig. 3-i4a. The male is smaller andhas a brownish-yellow abdomen, while in the female the firsthalf of the abdomen is reddish-orange and the rest is black. Theadults are abroad in May, l3ut are very shy and are seldom Fig. 345.—Currant stem girdled by the stem-girdler. (After Slingerland.) They are saw-flies in the truest sense of that term, for the femalemakes most effective use of her saw-like ovipositor, as has beenvery interestingly described and illustrated by Professor Slinger-land. The ovipositor is thrust into the cane for its whole length,,and through it the egg is deposited in the pith. The egg is anelongate-oval shape, yellowish-white, and about one-twenty-fifthinch long (Fig. 344d). Immediately the female moves an inchor two higher and girdles the stalk by numerou:: thrusts of herovipositoi, which is thrust in and then given a twist to one sideso that it comes out at one side of where it was forced in, andmakes a horizontal cut. The eggs are laid in late May and early INSECTS INJURIOUS TO CURRANT AND GOOSEBERRY 481 June and hatch in about eleven days. The young larvae boreinto the pith, but the tunnel rarely extends over six inches belowthe point girdled. The full-grown larva is hardl
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
