The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects . et No. 71 ofthe Board of Agriculture and Fisheries describesthe life-history :— The females lay their eggsin clusters of 9 to 40 or more on the undersurface of the leaves, attaching them by oneend. The eggs may hatch in less than a week,but, if conditions are unfavourable, hatching eggs or more, and the lif e-history is so short, thetwo or three generations result in exceedinglyrapid growth in numbers, and this frequentlytends to very severe damage to the Potato a paper read before the Royal C
The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects . et No. 71 ofthe Board of Agriculture and Fisheries describesthe life-history :— The females lay their eggsin clusters of 9 to 40 or more on the undersurface of the leaves, attaching them by oneend. The eggs may hatch in less than a week,but, if conditions are unfavourable, hatching eggs or more, and the lif e-history is so short, thetwo or three generations result in exceedinglyrapid growth in numbers, and this frequentlytends to very severe damage to the Potato a paper read before the Royal Colonial in-stitute on June 13, Mr. James Buckland statedthat a single pair of Colorado Beetles would,without check, increase in one season ,000. Quoting from the GardenersChronicle of the time, we find an Americanwriter saying in Hardwickes Science Gossip in1874 that A man must witness the myriadlegions of this insect and the ravages of its never-tiring larvae in order to form an idea of theterrible danger with which Europe is threat-ened. The damage done consists in the devour-. FlG. 86.—THE COLORADO BEETLE (NATURAL SIZE). * The previous articles appeared on September 27, Octo-ber 12, November 2, ami December 7. 1912, ami on Feb-ruary 1, March 1, March 15, April 26, May :i, May 24, June 7August 10, September (i, and September 13, 1913. may be delayed beyond that period. Chittendensays that the larvae take from 16 days to threeweeks to attain maturity. When full-fed thelarva leaves the plant and passes into the soil,where pupation takes place in a cell. The pupa-tion stage in the most favourable conditions maybe over in a week. Thus, where the environ-ment is very favourable, the whole life-cyclecan be completed in a month. Two generationsare recorded as occurring in some parts of theUnited States in the course of a year, and inother parts three generations. When theweather begins to turn cold in the autumn thebeetles bury themselves in the earth for hiberna-tion. A
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