Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . Fijr. 5(Xi. Thi Colorado potato beetle, Drii]>lir<i dwcm-lineatu Say(Fig. 50G ; a, eggs ; h. the larvae in different stages of growth ;c. tlu- pupa ; (7, beetle ; e, elytron, magnified ; /. leg, magnified)has gradually spread eastward as far as Indiana, from itsoriginal habitat in Colorado, having become very destructiveto the potato-vine. It becomes a beetle within a month afterhatching from the yellowish eggs; the larva is pale yellowwith
Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . Fijr. 5(Xi. Thi Colorado potato beetle, Drii]>lir<i dwcm-lineatu Say(Fig. 50G ; a, eggs ; h. the larvae in different stages of growth ;c. tlu- pupa ; (7, beetle ; e, elytron, magnified ; /. leg, magnified)has gradually spread eastward as far as Indiana, from itsoriginal habitat in Colorado, having become very destructiveto the potato-vine. It becomes a beetle within a month afterhatching from the yellowish eggs; the larva is pale yellowwith a reddish tinge and a lateral row of black dots. and Kiley state that there are three broods of larvaevery year in North Illinois and Central Missouri, each ofwhich goes under ground to pass into the pupa state, the lirsttwo broods coming out of the ground in the beetle state about 509. d Fig. 5061. ten or twelve days afterwards, while the third brood of beetles stays under ground all winter, and only emerges late in the following spring, just in time to lay its eggs upon the young po- tato leaves, which it devours to such an ex- tent as to sometimes almost cut off the en- tire crop in certain lo- calities. The Editors of the American En- tomologist, from whom we have quoted, enumerate and lignre various beetles, hemiptera, and a species of Tachina fly (Lydella doryphoraj Riley) which mostly prey upon the larv;e. Dr. II. Shinier shows, in the American Naturalist, vol. iii, p. !>1, that a dry and hot summer is very unfavorable to Hie development of this insect, the pupae dying for want of suffi- cient moisture in the soil. The best remedy against its attacks is hand picking. A very closely allied species or variety, the D. jtuiH<i. (Jer-mar (Fig. ^(JG1), may be easily confounded with the other spe-cies, but differs, according to AValsh, in the headof the larva b
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectinsects
