Insect pests of farm, garden and orchard . - abandon theold wood and attack newshoots, but he observednone entering the Washington, the in-fested plants seldomshow any signs of thepresence of the borersother than a poor. Fig. 328.—Raspberry root-borer (Bembeciamargiiiatn Harr.): n, female and malelarva? full grown; />,male and female pupa?;c, female, and d, male moths resting onleaf; e, e, eggs—slightly reduced. (AfterLawrence.) growth, though occasional!} a few hills will die where the roots havebeen riddled by the larva, the injui} l)eing mostly in the INSECTS INJURIOUS T
Insect pests of farm, garden and orchard . - abandon theold wood and attack newshoots, but he observednone entering the Washington, the in-fested plants seldomshow any signs of thepresence of the borersother than a poor. Fig. 328.—Raspberry root-borer (Bembeciamargiiiatn Harr.): n, female and malelarva? full grown; />,male and female pupa?;c, female, and d, male moths resting onleaf; e, e, eggs—slightly reduced. (AfterLawrence.) growth, though occasional!} a few hills will die where the roots havebeen riddled by the larva, the injui} l)eing mostly in the INSECTS INJURIOUS TO RASPBERRY AND BLACKBERRY 4G1 roots. The borer, according to Lawrence, first enters the rootsand tunnels through them promiscuously until the second spring,and then directs its course upward, entering and eating the pith ofthe cane for a distance of one to five inches. At the end of thefirst summer the larva is one-half to three-quarters inch long. Bythe middle of the second summer the larva is full grown andbores an exit hole through the wood and bark just above thecrown, leaving the hole covered by the epidermis only. Thelarva then descends into the tunnel and pupates. The pupa is about three-quarters inch long, re
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1912
