Insect pests of farm, garden and orchard . ^ has been observed in New York, Canada, Michigan,Pennsylvania, and recently it has become a serious pest in Wash-ington, so that it is undoubtedly much more widely distributedthan the records indicate. The parent fly, shown in Fig. 338,is grayish black, much resembling the house-fly, but slightlysmaller. Life History.—The flies appear in April and deposit their eggsas soon as the shoots are well above ground, continuing until early * Phorbia rubivora Coquillet. Family Anthomyidce. See Slingerland,Rulletin 126, Cornell Univ. Agr. Exp. Sta., p. 54; W.
Insect pests of farm, garden and orchard . ^ has been observed in New York, Canada, Michigan,Pennsylvania, and recently it has become a serious pest in Wash-ington, so that it is undoubtedly much more widely distributedthan the records indicate. The parent fly, shown in Fig. 338,is grayish black, much resembling the house-fly, but slightlysmaller. Life History.—The flies appear in April and deposit their eggsas soon as the shoots are well above ground, continuing until early * Phorbia rubivora Coquillet. Family Anthomyidce. See Slingerland,Rulletin 126, Cornell Univ. Agr. Exp. Sta., p. 54; W. H. Lawrence, Bulletin02, Wash. Agr Exp. Sta. 470 INSECT PESTS OF FARM, GARDEN AND ORCHARD June. The wliite egg (Fig. 33S, c) is elongate, about one-fifteenthinch long, and is laid in the axil of a young leaf at the tip of ashoot (Fig. ;33S, rl). The (\<!;g hatches in a few days, and the little. Fig. 338.—The raspbcMiy caiie-iiuiggot (Fhorhia ruhironi Coqviillet): a, adult^ female fly; much enlaified; b, raspberry shoots girdled by the maggot,natural size; r, egg nuich enlarged; d, tips of shoots each bearing an eggin natural position in the leaf axils, natural size. (After Slingerland.) INSECTS INJUKlOrS TO RASPBERRY AND BLACKBERRY 471 maggot burrows into the pith of the .shoot, leaving a conspicuousentrance hole, which becomes blackish. It tunnels downward,making a small tortuous channel, and after boring for a few daysabout half way down the shoot, it works its way out to justbeneath the bark and tunnels around the shoot, often in a spiral,so as to completeh girdle it, and usualh- eats a small hole throughthe bark at this point. The maggot continues to feed on thepith at this point so as to nearly sever the shoot, the tip of whichsoon wilts and droops, turning a deep blue color. On blackberr}shoots, however, the bark is so thick that although the tip droops
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