. Annals of applied biology. Biology, Economic; Biochemistry. ^r. ]l. Taylor 61 35 to 50 seconds, the duration being influenced no doubt by the species and age of the leaf, the vigour of the fly and other factors. In captivity, a fly sometimes oviposits in a leaf while crawling on the upper surface, and on these occasions, probably because the tissue is more compact on this side, the process lasts somewhat longer. For example, it was noticed that a fly which spent about 50 seconds in passing an egg into a piece of celery leaf from above, required about 10 seconds less when inserting an egg fro
. Annals of applied biology. Biology, Economic; Biochemistry. ^r. ]l. Taylor 61 35 to 50 seconds, the duration being influenced no doubt by the species and age of the leaf, the vigour of the fly and other factors. In captivity, a fly sometimes oviposits in a leaf while crawling on the upper surface, and on these occasions, probably because the tissue is more compact on this side, the process lasts somewhat longer. For example, it was noticed that a fly which spent about 50 seconds in passing an egg into a piece of celery leaf from above, required about 10 seconds less when inserting an egg from below. At hatching, which takes place in about six days, the larva breaks through the egg-shell at the end pointing away from the puncture in the cuticle, and burrowing forwards, eats out at first a narrow gallery in the tissue, but after a few days changes its mode of attack, and mining in all directions gives rise to a wider cavity less regular in shape. Increasing in size as the larva feeds, the cavity thus produced often coalesces with others of the same kind, and, with these additions, forms a compound blister containing it may be several larvae—a circumstance which has perhaps given rise to the existing impression that the Celery Fly, like Pegomyia and other blister-making flies, lays its eggs upon the surface, whereas it resembles more closely such flies as the Phytomyzidae, which lay their eggs in the interior of Celery-fly Egg in leaf of Hcracleuni. showing puncture made by fly. (Drawn by Miss E. M. Wright.). 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 Association of Applied Biologists; Association of Economic Biologists. [Wellesbourne, Warwick, etc. ] Association of Applied Biologists [etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1919
