Insect pests of farm, garden and orchard . ge root (>(l witli maggots. (Ailcr Slingcilaiid.) the haid stem above ground. The eggs are al)out one twenty-fifth inch long, of a pure white color, which renders themeasily seen against the soil by one familiar with them, and are of theshape shown in Fig. 251, having a curious ridge along one side. Theeggs hatch in from three to ten days, averaging five to little maggots at once commence rasping the surface of thetender roots, gradually mine into them, and in three or four weekshave become full grown. The gi-own maggot is one-thir
Insect pests of farm, garden and orchard . ge root (>(l witli maggots. (Ailcr Slingcilaiid.) the haid stem above ground. The eggs are al)out one twenty-fifth inch long, of a pure white color, which renders themeasily seen against the soil by one familiar with them, and are of theshape shown in Fig. 251, having a curious ridge along one side. Theeggs hatch in from three to ten days, averaging five to little maggots at once commence rasping the surface of thetender roots, gradually mine into them, and in three or four weekshave become full grown. The gi-own maggot is one-third inch INJURIOUS TO CABBAGE AND CRUCIFEROUS CROPS 349 long, white or yellowish in coloi, taperiii*-; toward the head andobliquely truncate at the tip of the abdomen. From the head apair of strong, black, hook-like, rasping jaws project downward,and just back of the head on either side is a minute, light brown,fan-like projection (Fig. 253, 6), or spiracle, which leads into thebreathing system. The obliiiiic [jostc^ior end is surrounded by. Fig. 250.—The cabbage maggot fly {Peyoitiyia hrassiae Bouche), femalegreatly enlarged. (After Slingerland.) twelve rounded tubercles and in the centre are two brownish spira-cles (Fig. 253, fl). When done feeding the larva burrows one-halfto one inch under the surface of the soil, and the outerskin graduallyhardens until it forms a firm brown shell, called a puparium,within which the larva transforms to a true pupa. Frequently thepuparia are found in the galleries made by the maggot or in crevicesof the roots. During the summer this stage lasts about two weeks,but in the fall most of the insects remain in this cohdition over win- 350 INSECT PESTS OF FARM, GARDEN AND ORCHARD
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1912
