Spring grain-aphis or so-called "green bug" (Toxoptera graminum Rond.) . ut a series of care-ful experiments in spraying withJisrosen^ ^ emuMon and w^ithwhjLle::oil^..§Qapsuds. From these experiments it was found possibleto destroy 50 per cent or more of the green bugs at an expense ofabout $4 per acre. This treatment, of course, is intended for use onlywhere, as seems to be more usual to the southward, the outbreaks ofthe pest originate in spots in the fields. Mr. Ainslie also tried covering some of these spots with straw andburning it, thus destroying, of course, both grain and green
Spring grain-aphis or so-called "green bug" (Toxoptera graminum Rond.) . ut a series of care-ful experiments in spraying withJisrosen^ ^ emuMon and w^ithwhjLle::oil^..§Qapsuds. From these experiments it was found possibleto destroy 50 per cent or more of the green bugs at an expense ofabout $4 per acre. This treatment, of course, is intended for use onlywhere, as seems to be more usual to the southward, the outbreaks ofthe pest originate in spots in the fields. Mr. Ainslie also tried covering some of these spots with straw andburning it, thus destroying, of course, both grain and green , too, gave encouraging results, and probably would prove effect-ive if applied earlier in the season, when the pest first begins toappear and the infested spots are small. At Hooker, Okla., Mr. Phillips tried the efficiency of plowing thesespots under, and as the field in which he was working was isolatedand the green bugs did not make their way in from without, hewas able to show conclusively that such outbreaks, under certainconditions, may be stopped. [Cir. 93]. 10.—Winged female of tbo green,? parasitized bj Lysiplilehus tritici.(Original.) buEnlarged. 20 In summing up these field experiments, tlien. it is found that thesespots ma}^ be treated successfully either by plowing- under and har-roTving and rolling the surface of the ground, by spreading strawover them and burning, or by treating with a 10 per cent solution ofkerosene emulsion. Except in the southernmost regions infested bythis pest, however, the greatest difficulty does not arise from theseisolated colonies, which seem to extend outward day after day, butfrom the fact that, after their food supply has become either largelydestroyed or the grain too old and tough for them to feed ujDon,jimmense _SAvarms of winged achilts jire j2ip^^i^^ced, and these drift,in general, northward with the advance of the season and infest thegrain fields of entire sections of the country much earlier and morecompletely than woul
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