. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges. Beneficial insects. THE INSECT WORLD. Fig. 204. considerably in form and habit, but are often more or less viscid, and are then termed slugs. Belonging" to the genus Lema is a little series of species, several of which feed upon the potato, and of these the best known is the Lei)ia j-iineata, or " 3-lined ; It is yellow in color, the head and thorax much narrower than the body, and the wing-covers have three broad, black stripes. It i
. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges. Beneficial insects. THE INSECT WORLD. Fig. 204. considerably in form and habit, but are often more or less viscid, and are then termed slugs. Belonging" to the genus Lema is a little series of species, several of which feed upon the potato, and of these the best known is the Lei)ia j-iineata, or " 3-lined ; It is yellow in color, the head and thorax much narrower than the body, and the wing-covers have three broad, black stripes. It is rarely abundant now a-days, though at one time a somewhat important species, and it may be easily controlled by the use of the arsenites. In fact it is the treatment adopted for the better-known " Colo- rado " beetle that has in a large measure exterminated the Lema. Somewhat allied in form are two species of Crioceris, both feeding on asparagus, and both introductions from Europe. The common "asparagus-beetle," C. asparagi, is about one-fourth of an inch in length, the wing-covers black with red or yellow markings, the thorax red with black dots. It hibernates as an adult, and appears early in spring, eating into the asparagus shoots and laying its eggs upon them. These eggs are black and quite long, cylin- drical, set on end so as to project from the shoots in every direction. The larvae hatch soon thereafter, and are slimy, greenish slugs, with black dottings, a blackish head, and black legs. They often do great in- jury, particularly on young plants. On beds where cutting is done, a few shoots should be allowed to grow as traps during the cutting season, and on these the ma- jority of beetles will oviposit. In a week they should be cut and destroyed, other shoots being allowed to take their place, to be similarly treated thereafter. If this prac- tice is kept up for a month, no injury need be anticipated later on, as the species will hz too much reduce
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