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Image 7 of Bulletin n.96.

Part of Kentucky Agricultural Experiment Station

i l t The Hessia2z Fly. 197 I I But when confined, a single female may place all of those laid - by her on such plants as may be provided. In one instance a female confined at the Station placed 64 eggs on two young . z wheat plants growing in a flower pot. These were invariably, { as they were in the field, on the upper sides of the blades, in 2 the small longitudinal grooves. In some cases a half dozen - were placed together in a single groove, end to end, in others i but one was noted in a place. They were scattered in this P instance over much of the lengths of the blades, some being . _ placed near the tips, others near the bases. In the field they " were generally found 2 or 3 together on the lower halves of the 1 biades. Quite often the flax seeds (puparia) of the Hessian fly are ) spoken of by farmers as tl1e "eggs." They do look like the .-* 3 I eggs of some insects, but not at all like those of the fiy. They are the resting stage of the insect, between the grub and adult Y stages. It must be remembered that the egg of the Hessian V fly is always found exposed on the upper sides of the blades, i 1 never under the sheaths at the base of the plant, and that it ~ is only to be found on the blades during the fall, and again ' -' for a short period in spring, when the winter brood l1as i emerged as adults and is laying eggs for a second brood to $1 carry the species through the summer. ' Eggs obtained October 3 measured just 0.50 millimeter (_ _ b A (0.02 inch) in length, by 0.07 millimeter in diameter. They ";` Y were cylindrical, smooth, rounded at the tips, sometimes Y curved. a little ; color, light red. d The flax seed or puparium, on the Other hand, measures 4 millimeters (0.16 inch) long, and 1.25 millimeter in diameter, being 8 times longer than the egg and every way larger. - k ` The following table gives the data dealt with above in lt condensed shape. The figures with reference,-to temper- if l' . ature were kindly copied for me by Mr. \/V. E. Gary from " records kept by the local \Veather Station : l lL ` . I /

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