. Insect pests of farm, garden and orchard . in the sap-woodduring the second season, and it is at this time the most seriousdamage is done, for where several occur in a tree they almostgirdle it. The next season they penetrate into the heart-wood,and several of them will fairly riddle a small tree with theircylindrical borrows. The full-grown larva continues this burrow 590 INSECT PESTS OF FARM, GARDEN AND ORCHARD out into the bark, often cutting clear across a tree. The upperpart of the burrows are stuffed with fine borings and the lowerpart with long wood fibres. The full-grown larva is a l
. Insect pests of farm, garden and orchard . in the sap-woodduring the second season, and it is at this time the most seriousdamage is done, for where several occur in a tree they almostgirdle it. The next season they penetrate into the heart-wood,and several of them will fairly riddle a small tree with theircylindrical borrows. The full-grown larva continues this burrow 590 INSECT PESTS OF FARM, GARDEN AND ORCHARD out into the bark, often cutting clear across a tree. The upperpart of the burrows are stuffed with fine borings and the lowerpart with long wood fibres. The full-grown larva is a lightyellowish, cylindrical grul3, al^out three-quarters inch long. Thehead is small, legs are lacking, and the liody tapers graduallyfrom the thorax backward, the segments bcsing quite third spring the larvae transform to pupic and al)Out threeweeks later the adult beetles emerge through large round holes. Control.—The females may be prevented from lajing theireggs by wrapping the trunks with wire netting, building paper,. Fig. 445.—Work of the round-headed apple-tree borer: a, puncture inwhich egg is laid; b, same in section; e, hole from which beetle hasemerged; /, same in section; g, pupa in its cell. (After ; or wood veneer. If non-rusting wire netting is used it may beleft on and will also protect the trees from mice and paper or wood wrappings should be applied about May 1st,and removed in late summer. They should be tied to the treetightly just below the crotch and should extend an inch or twointo the soil below. The wire netting should be held out fromthe trunk of the tree l^y a layer of cotton batting under it at theupper end. Various washes have been used to repel the whale-oil or caustic soft-soap to which a pint of crudecarbolic acid is added to every 10 gallons is often used and should INSECTS INJURIOUS TO THE APPLE AND PEAR 591 be painted over the trunk so as to form a thick coating. Othersrecommend a thick co
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
