. Annual report. Entomological Society of Ontario; Insect pests; Insects. Fig. Stem-iriother, enlarged ; head and antenna still more Fig. 36: First migrant from the plum, third generation, enlarged; head at side still more enlarged. the season they may be found pairing with the wingless females, which stock the twigs with the winter eggs (Fig. 39). Such, briefly, is the life-history. Twelve generations may be produced during the year, but there is great irre- gularity in the development of these generations and the return migrant from the Hop is produced at the end of the season whe
. Annual report. Entomological Society of Ontario; Insect pests; Insects. Fig. Stem-iriother, enlarged ; head and antenna still more Fig. 36: First migrant from the plum, third generation, enlarged; head at side still more enlarged. the season they may be found pairing with the wingless females, which stock the twigs with the winter eggs (Fig. 39). Such, briefly, is the life-history. Twelve generations may be produced during the year, but there is great irre- gularity in the development of these generations and the return migrant from the Hop is produced at the end of the season whether from individuals of the fourth or fifth generation, or of the twelfth-" " Each parthenogenetic female is capable of producing on an average one hundred young (the stem-mother pro- bably being more prolific), at the rate of one to six, or an average of three per day, under favourable conditions. Each generation begins to breed about the eighth day after birth, so that the issue from a single individual easily runs up, in the course of the summer, to trillions. The number of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of Ontario; Ontario. Dept. of Agriculture. Toronto, The Society
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
