. Insect pests of farm, garden and orchard . tsthe aphides migrate to various grasses, being particularly fond ofKentucky blue-grass, and may subsist on corn, on which theymay feed until oats and wheat are available in the fall. Oats are thefavorite food, and outbreaks of the pest have always been worstwhere volunteer oats are generally grown, the aphides increasingon them in the early fall and winter and later spreading to October 15th in Minnesota and by early November in Kansasthe true winged males and wingless egg-laying females have been INSECTS INJURIOUS TO SMALL GRAINS 153 obse
. Insect pests of farm, garden and orchard . tsthe aphides migrate to various grasses, being particularly fond ofKentucky blue-grass, and may subsist on corn, on which theymay feed until oats and wheat are available in the fall. Oats are thefavorite food, and outbreaks of the pest have always been worstwhere volunteer oats are generally grown, the aphides increasingon them in the early fall and winter and later spreading to October 15th in Minnesota and by early November in Kansasthe true winged males and wingless egg-laying females have been INSECTS INJURIOUS TO SMALL GRAINS 153 observed, but strangely enough they have only been secured insmall numbers by being reared in the laboratory, and have notbeen observed in the field, so that although these females laid eggsfreely on the leaves of grain, we do not know whether they areessential or not to the life history of the insect in the field, forwhile the eggs are being produced other females continue to givebirth to live young until the cold of winter, and they have been.
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