. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 130 PESTS OF GARBEX AXD FIELD CROPS usually are stuiited and gi\'e a reduced ^ield, and the straw tends to break down. The adult of the grub that does this mischief is a small, black. four-winged fly. It lays its eggs in the standing stem of wheat in !May or June in the uppermost joint a"s'ailable. Several lan-ae may develop within a single stem. The lan-a remains in the straw until the following spring. In control cut the straw as low as possible, so as not to leave many larva in the field. Infested str
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 130 PESTS OF GARBEX AXD FIELD CROPS usually are stuiited and gi\'e a reduced ^ield, and the straw tends to break down. The adult of the grub that does this mischief is a small, black. four-winged fly. It lays its eggs in the standing stem of wheat in !May or June in the uppermost joint a"s'ailable. Several lan-ae may develop within a single stem. The lan-a remains in the straw until the following spring. In control cut the straw as low as possible, so as not to leave many larva in the field. Infested straw not used up by April 1 may be burned, but usually not many adults issue from dr\-, well-made straw stacks. The best measure is to burn the stubble in the field. TVhere clover is growing in the stubble, it is possible to choose a time in winter or spring when the clover has been frozen down, and will not be iajured. Rotation should be practiced, and wheat kept growing \igor- ously so that it may be well along by the time the adults come out to lay their eggs. In such plants the larva- will cause less loss in >ield than in backward or weak plants. A closely related species, Isosoma hordei attacks the stems of barley, causing a distortion of the stem at the point of injury, and more or less reduction in yield, as in the case of the species infesting wheat. The recommendations for control are the Flo. 1 0 9 . — T h e .Joint-worm. Lar\-a aiiri work. En- larged. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original O'Kane, Walter Collins, b. 1877. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
