The Insect Pests of Clover And Alfalfa

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The Insect Pests of Clover And Alfalfa
Justus Watson Folsom
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The eggs of both these pentatomids are heavily parasitized by a proctotrypid.
Syrphidce. Among the commonest insects of the clover field are several species of Syrphida, or flower-flies (Fig. 7, 8), some of which are known also as "sweat bees. " Many of these flies are banded with black and yellow, and have the habit of poising over this or that spot for a few moments and making short dashes from one place to another. The flies lay their eggs in or near colonies of plant-lice, upon which the la
...rvae are to feed. The larvae are leechlike in form, and generally green, yellow, or mottled brownish in color. They are often seen among the aphids, which they destroy at a rapid rate. The syrphid larva seizes an aphid between its hooklike jaws, holds it aloft and sucks the blood from the body, meanwhile waving itself to and fro. When full grown, the larva shortens and its skin hardens into a brown pear-shaped or elongate puparium, from which the fly will issue.
In this region the flies are seldom noticed in the clover field be- fore the latter part of April, but are abundant by the last of May.


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