Economic entomology for the . economicentomolo00smit_0 Year: 1896 2o6 AJV ECONOMIC ENTOMOLOGY. length. It is not economically important, unlike the 'broad- necked Prionus,' P. laticollis, whose larvae in blackberry are known as 'giant root-borers.' The beetle is black, robust, broader than usual, with a broad, toothed thorax, and from one to two inches in length. The larvae are immense, nearly three inches for a full-grown female, and they feed in the roots of a Fig. 195. The ' giant root-borer,' Prionus laticollis.— Larva, pupa, and adult. variety of trees and plants, including c
Economic entomology for the . economicentomolo00smit_0 Year: 1896 2o6 AJV ECONOMIC ENTOMOLOGY. length. It is not economically important, unlike the 'broad- necked Prionus,' P. laticollis, whose larvae in blackberry are known as 'giant root-borers.' The beetle is black, robust, broader than usual, with a broad, toothed thorax, and from one to two inches in length. The larvae are immense, nearly three inches for a full-grown female, and they feed in the roots of a Fig. 195. The ' giant root-borer,' Prionus laticollis.— Larva, pupa, and adult. variety of trees and plants, including chestnut, oak, cherry, apple, grape, and blackberry. They require three years to reach maturity, and are sometimes decidedly troublesome. There is no way of reaching the larvae except to dig them out, and in black- berry fields the sudden wilting of part or all of a hill indicates almost infallibly the presence ol one or more, which should then be found and destroyed at once. Grape and apple stand the injury better, 'but when a tree becomes badly infested nothing remains but to take it out and burn it. Even large trees are
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