The spring grain-aphis(Toxoptera graminum Rond.) . both young and old are devoured by lady beetlesand their larvae, great numbers of which can be observed at work in infested fields. The species that have been most conspicuous in thiswork are Coccinella 9-notata Hbst., G. sanguined L., Hippodamia paren-thesis Say, and R. convergens Guer. (fig. 3). Megilla maculata De rarely seen with the preceding in infested fields. Of the hymenopterous parasites Lysiphlebus tritici Ashm. is especiallyuseful. In southern Indiana, in 1890, this little slender, black, four-winged fly became excessively abu
The spring grain-aphis(Toxoptera graminum Rond.) . both young and old are devoured by lady beetlesand their larvae, great numbers of which can be observed at work in infested fields. The species that have been most conspicuous in thiswork are Coccinella 9-notata Hbst., G. sanguined L., Hippodamia paren-thesis Say, and R. convergens Guer. (fig. 3). Megilla maculata De rarely seen with the preceding in infested fields. Of the hymenopterous parasites Lysiphlebus tritici Ashm. is especiallyuseful. In southern Indiana, in 1890, this little slender, black, four-winged fly became excessively abundant and destroyed myriads of thepest. When at work this diminutive enemy of these aphides may beseen running over the plants, thrusting its ovipositor into their thereafter the body of the parasitized aphis becomes swollen androunded, and at the same time the skin hardens and changes in colorto a leather-brown. Shortly after, a circular disk is cut by the parasitein the body wall of its host, and pushing this out the fully developed.
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Keywords: ., bookauthorunitedstatesbureauofe, bookcentury1900, bookdecade1900
