. Annual report. Entomological Society of Ontario; Insect pests; Insects. 50 ENTOMOLOGICAL SOCIETY OF ONTARIO. The moths feeding on flowers are more likely to be found near low ground, and hence they appear to come from such place?. There appear to be three generations represented in a setson or two broods in a yetr ; the tint wintering as larvae, the second forming the "Armies," and the third larvae derived from these after the imago has been developed ; the last wintering as larvae. The army worm usually winters in the larval form, but sometimes as the moth. In the vicinity of our
. Annual report. Entomological Society of Ontario; Insect pests; Insects. 50 ENTOMOLOGICAL SOCIETY OF ONTARIO. The moths feeding on flowers are more likely to be found near low ground, and hence they appear to come from such place?. There appear to be three generations represented in a setson or two broods in a yetr ; the tint wintering as larvae, the second forming the "Armies," and the third larvae derived from these after the imago has been developed ; the last wintering as larvae. The army worm usually winters in the larval form, but sometimes as the moth. In the vicinity of our fields at Guelph, where the caterpillars were so numerous, we have as yet (Oct. 18th) failtd to find any of the second brood. The following stages (taken from Ri'ey's report 1882) in the life history of an Army worm gives a good idea of the length of time that elapses in passing from the egg to imago. Eggs laid M*y 4th, hatched May 11th, 1st moult May 17th, 2nd moult May 20th, 3rd moult May 23rd, 4th mo alt May 26th, 5ih moult May 29th : pupa June 2nd, imago June 17th. At the College the first caterpillars were observed on the 8th of July; on the 9th there was a preceptible increase, 12th a marked increase; 13th large numbers; 14th, 15th still very numerous; on the 16oh a perceptible decrease ; 17ih the decrease quite marked; 18th, 19th comparatively few; 20ih only a few stragglers could be seen, and, most of these, were light colored. Towards the close of the attack, a bacterial disease seemed to destroy some of them. It is a matter of surprise to many how these caterpillars appear and disappear so suddenly, but a little reflection upon their life history explains the mystery. Hidden in the grass by day, and feeding at night, they escape observation. If one or more dry seasons come, they multiply rapidly. Large numbers winter in the larval condition, and during the following spring moths appear and lay many eggs, which hatch and give rise to innumerable caterpillars which from
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
