. Injurious insects : how to recognize and control them . Insect pests; Insect pests. MINUTE WOSMS WORKING IN THE SEED 219 The Sorghum Midge {Contariiiia sorghicola Coq.) Heads of sorghum are attacked bj^ the larva of a minute two- wiuged insect or " midge," preventing the formation of seed. If infested heads are examined, the seeds will be found shri\'eled, while beside them may be seen a tiny grub. Profitable crops of seed can- not be secured where the midge is abundant. The first generations of the midge arc passed in other plants that matm'e heads earlier, notably Johnson grass.
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. MINUTE WOSMS WORKING IN THE SEED 219 The Sorghum Midge {Contariiiia sorghicola Coq.) Heads of sorghum are attacked bj^ the larva of a minute two- wiuged insect or " midge," preventing the formation of seed. If infested heads are examined, the seeds will be found shri\'eled, while beside them may be seen a tiny grub. Profitable crops of seed can- not be secured where the midge is abundant. The first generations of the midge arc passed in other plants that matm'e heads earlier, notably Johnson grass. By the time the sor- ghum is sufficiently matm-c the midges are numerous. Eggs are laid witliin the developing seeds. Remedial measures include destruction of Jolmson grass, and clean harvesting in the fall. The Clover Flower-midge {Dasyneura leguminicola Lint.) The presence of the clover fiower-midge is recognized by the fact that the florets of clover bloom fail to develop normally, become shrunken, and the whole head lacks color. The adidt insect is a minute, gnatlike creature with long legs and dusky wings. Eggs are laid in the clover head, and the larva feeds in the ovaries, preventing the normal expansion of the floret and the development of seed. A pupal stage is passed in the ground, followed by a second brood at the time of the second blooming of clover. Winter is passed in the soil. In fields containing mostly clover and httle timothy it is. Fig. '27'2. — Clover head shoeing irregu- lar blooming caused h>" the Clover Flower-midge. 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
