. The Garden : an illustrated weekly journal of gardening in all its branches. any blanks in its history filled up. One of the crltivators whohas suffered from its ravages (Mr. J. Knowles, of Blackburn),has paid particular attention to it, and he has favoured us withsome memoranda relating to it, which may be of interest tothe Oniou grower, the more that they relate to the depositingof the egg, which, we need scarcely say, is the most importantpoint in all efforts to counteract insect damage, and that towhich our attention ought to be mainly directed. After the. Fig. 2.—Onion-By. Larva, chrysa
. The Garden : an illustrated weekly journal of gardening in all its branches. any blanks in its history filled up. One of the crltivators whohas suffered from its ravages (Mr. J. Knowles, of Blackburn),has paid particular attention to it, and he has favoured us withsome memoranda relating to it, which may be of interest tothe Oniou grower, the more that they relate to the depositingof the egg, which, we need scarcely say, is the most importantpoint in all efforts to counteract insect damage, and that towhich our attention ought to be mainly directed. After the. Fig. 2.—Onion-By. Larva, chrysalis, and perfect fly ; all magnified. egg has been deposited it is usually too late to interfere witheffect. The mischief has been, if not already done, at leastalready promised, and promises for evil are a kind of promisesthat are generally only too well kept. It has usually been saidthat the eggs of the Onion-fly were deposited upon the leaves ofthe Onion, close to the surface of the ground, and that thegrubs penetrated through the outer leaf, making their waydown to the base of the bulbs between the leaves; but,from the observations of Mr. Ivnowles, it appears that thisis not quite the course of proceeding. His observation isthat the eggs are deposited on the joints of the leaves (asat aa in fig. 1) in small clusters from two to seven in number, probably at night or in the early morning. They are oblong,white and waxy in colour, and from one-tenth to one-eighth oEan inch in length. On being touched these eggs seemed tohim to give a little spring off
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