. Insect pests of farm, garden and orchard . rface, may attimes be perforated in all directions by dirty Ijrownish burrows,from which the whitish or yellowish larvae may be found some-times projecting. Celery is also attacked, the larva? eating thethick part of the root when it is half grown, stunting the plant soas to make it worthless for market. The life history of the species * Psila rosoe Fab. See Chittenden, Bulletin 33, n. Division of Ento-mology, U. S. Dept. Agr., p. 26. 416 INSECT PESTS OF FARM, GARDEN AND ORCHARD does not seem to have been carefully ol)scrvcd, ))ut from analogyis
. Insect pests of farm, garden and orchard . rface, may attimes be perforated in all directions by dirty Ijrownish burrows,from which the whitish or yellowish larvae may be found some-times projecting. Celery is also attacked, the larva? eating thethick part of the root when it is half grown, stunting the plant soas to make it worthless for market. The life history of the species * Psila rosoe Fab. See Chittenden, Bulletin 33, n. Division of Ento-mology, U. S. Dept. Agr., p. 26. 416 INSECT PESTS OF FARM, GARDEN AND ORCHARD does not seem to have been carefully ol)scrvcd, ))ut from analogyis probably somewhat similar to that of the cabbage root-maggot,except that the maggots of the carrot rust-fly develop and trans-form on carrots in storage if the temperature be sufficient. Control.—Late sowing has been practiced to advantage, andthe rotation of crops is of obvious importance, as is the deep plow-ing of infested land. Where carrots have been stored in earth, thisearth into which the larvae have entered and pupated should be. Fig. 300.—The carrot rust-fly {Psila rosae Fab.): cf, male fly; 9 , female fly,side view; a, antenna of male; b, full-grown larva from side; c, spiraclesof same; a, anal extremity from (he end; e, puparium; /, young larva;g, anal segment from the side—eight times natural size except a, c, d, g,more enlarged. (After Chittenden, U. S. Dept. Agr.) treated, either by burying it deeply, spreading it out in thin layerson the surface, or throwing it into pools where it will be emulsion, 1 part stock solution to 10 of water sprayedalong the rows while the carrots are young, or sand, land plasteror ashes, to 3 gallons of which 1 pint of kerosene has been added,sprinkled along the rows, have been of some value in should be applied three or four times, once a week after theroots begin to form, and particularly after the rows have beenthinned. MISCELLANEOUS GARDEN INSECTS 417 The Parsnip Webworm * The Parsnip Webworm is
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