Insect pests of farm, garden and orchard . Fig. 91.—The Hessian fly, adult male—greatlyenlarged. (After Marlatt, U. S. D. Agr.) 126 INSECT PESTS OF FARM, GARDEN AND ORCHARD fall will delay the appearance of the flies, even with normal tem-perature conditions, and the further south, the later they experiments being conducted by the U. S. Bureau of Ento-molojiy, Professor F. states that the following dates willprobal)lv ])e found safe for sowing wheat in average seasons: in. Fig. 92.—Flax-seeds or puparia of tlie Hessian fly on young wheat—enlarged. (After Pettit.) northern
Insect pests of farm, garden and orchard . Fig. 91.—The Hessian fly, adult male—greatlyenlarged. (After Marlatt, U. S. D. Agr.) 126 INSECT PESTS OF FARM, GARDEN AND ORCHARD fall will delay the appearance of the flies, even with normal tem-perature conditions, and the further south, the later they experiments being conducted by the U. S. Bureau of Ento-molojiy, Professor F. states that the following dates willprobal)lv ])e found safe for sowing wheat in average seasons: in. Fig. 92.—Flax-seeds or puparia of tlie Hessian fly on young wheat—enlarged. (After Pettit.) northern ]\Iichigan soon after the 1st of Septeml^er; in southernMichigan and northern Ohio, about September 20th; in southernOhio after the first week in October; in Kentucky and Tennessee,October 10th to 20th; in Georgia and South Carolina, October INSECTS INJURIOUS TO SMALL GRAINS 127 25th to November L5tli. The exact time will also depend uponaltitude as well as latitude. A rotation of the wheat crop compels the flies when they emergefrom the stubble to travel in search of the young wheat storms or heavy winds occur, the frail little flies will be de-stroyed in large numbers, whereas if they found wheat immedi-ately available the mortality would be small. Inasmuch as most of the spring brood remain in the stubblein the flaxseed stage after harvest, if the fields be then burnedover, large numbers will be destroj-ed. This may be done by cut- A y
Size: 1178px × 2121px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1912
