Report of the State Entomologist on the noxious and beneficial insects of the state of Illinois . in the fall, can only be accounted for on the supposition thatsome of the beetles which have hibernated, are conveyed to the newfield on the plants or in the earth about their roots. It will per-haps be objected that these new fields may be infested from a dis-tance, notwithstanding the well-known sluggishness of the adult, bybeetles which take wmg. This hypothesis is at once disposed of,however, by a fact curiously simple and of easy observation, butwhich has hitherto escaped attention, and whish
Report of the State Entomologist on the noxious and beneficial insects of the state of Illinois . in the fall, can only be accounted for on the supposition thatsome of the beetles which have hibernated, are conveyed to the newfield on the plants or in the earth about their roots. It will per-haps be objected that these new fields may be infested from a dis-tance, notwithstanding the well-known sluggishness of the adult, bybeetles which take wmg. This hypothesis is at once disposed of,however, by a fact curiously simple and of easy observation, butwhich has hitherto escaped attention, and whish at the same timeaccounts for the slow spread of the pest, viz: that the beetle ispractically wingless, and incapable of flight. There can scarcely be a shadow of doabt remaining that thisspecies is single-brooded, since it has now been traced throughoutthe entire period from the first of August to the first of May, oc-curring in the beetle stage during these nine months, and leaving but aperiod of three months for the hatching and development of theearliest larvae to the adult condition. 71. Fig. 8. Work of Strawberry Crown-borer fragaricr, Riley.) Verlicalsection of the crown, showing the entire work of one borer. The larva has acquired itsgrowth, and completed its , and the newly hatched beetle is shown atthe bottom of the burrow. Tl
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbenefic, bookyear1876
