. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 162 PFSTS OF GARDEX AND FIELD CROPS The Hop Flea-beetle ( pundulata ]^Ielsh.) Leaves of hops, sugar beets, and some other plants are attacked by verj- small, active beetles, which feed at first on the tender shoots and buds and later eat holes in the leaves. The adult is about one tenth of an inch long, shining black, its upper surface marked with mam' minute pits in regular rows. The lar^-a is slender, whitish, and Uves in the ground. There are two generations in the hop regions of the north Pacif
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 162 PFSTS OF GARDEX AND FIELD CROPS The Hop Flea-beetle ( pundulata ]^Ielsh.) Leaves of hops, sugar beets, and some other plants are attacked by verj- small, active beetles, which feed at first on the tender shoots and buds and later eat holes in the leaves. The adult is about one tenth of an inch long, shining black, its upper surface marked with mam' minute pits in regular rows. The lar^-a is slender, whitish, and Uves in the ground. There are two generations in the hop regions of the north Pacific coast. The insect hibernates as an adult. On sugar beets control is not easy. Bor- deaux acts as a fairly effective repellent. A fair proportion of beetles may be poisoned by apphing arsenicals. Fig. â The Hop Flea- TMiere the beetles appear suddenly in de- beetle. Enlarged and , â i_ ^l ⢠i, Jr. . structive swarms on hops, their ntmibers ma J' natural size. Onginal. ^ be reduced materially by brushing them from the â sines and catcliing them on sticky shields made by stretching cloth over Ught frames and coating the surface with tar. Banding the ^â¢ines and poles with tanglefoot before the adults first appear will largely protect the ^-ines, since the adults seem to follow the habit of crawling up the â sines instead of filing. The Alfalfa Leaf-weevil iPhytonomus posticus Fab.) Alfalfa throughout the Western states is seriously threatened by this pest, which is native to Europe and Asia and lias accidentally been introduced into this coimtrv'. The plants are injured l;>oth by the adult weevils and by their young or grubs. Depredations begin in early spring, when the beetles come out from their winter quarters and puncture the young stems of alfalfa to make places for depositing their eggs. Shortly the grubs hatch and begin feeding on the tender leaves and the crov\Ti of the plant. Transformation to the adult stage begins in June, and later the beetles. Ple
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