Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . he young larvae, and inserious cases a third spraying a week or ten days thereafter willbe beneficial. When the larvie are full grown they descend thetrunk to the ground, where they change to bright-yellow pupaeamong the grass or rubbish on the surface. Here they may bedestroyed by hot water, kerosene, strong soap-suds, lime, orother suitable substances, and the second brood, where suchoccurs, may thus be materially lessened. Where there are twobroods or more, repeated sprayi
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . he young larvae, and inserious cases a third spraying a week or ten days thereafter willbe beneficial. When the larvie are full grown they descend thetrunk to the ground, where they change to bright-yellow pupaeamong the grass or rubbish on the surface. Here they may bedestroyed by hot water, kerosene, strong soap-suds, lime, orother suitable substances, and the second brood, where suchoccurs, may thus be materially lessened. Where there are twobroods or more, repeated sprayings will be necessary, extendingthroughout the summer. If these methods are generally adoptedthe insect can be satisfactorily controlletl. Protecting a few treesonly among many that are neglected will always be difficult andcan be at best only partly successful.* * For detailed information concerning the treatment of trees in citiesor towns, or on a large scale, the publications of the United States De-partment of Agriculture and of the New Jersey Experiment Stationshould be consulted. 2l8 A A ECONOMIC ^ V XI ,; V rf^ rt ex > 3 P. a •> • - V (U Z THE INSECT WORLD. 219 Distinct from all the forms hitherto mentioned are the flea-beetles, so called because of their greatly enlarged hind femora,giving them the power of making sudden leaps ending in have many species, and some of them are decidedly injuriousand troublesome to deal with. The grape flea-beetle is a well-known species called Halticacha/ybea, from its steel-blue color, and it feeds both as adult andlar\a on the leaves of the grape. The larvae are blackish andslender, slug-like and somewhat viscid, feeding in companyduring a great part of their growth. They are easily controlledby any stomach poison, and the Bordeaux mixture, applied as afungicide, seems to be effective in keeping them in check. The genera Crepidodera and Epitrix contain a number ofsmall species, among which the cucumber
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
