The Buckthorn Aphid (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from The Buckthorn Aphid

Small aphids, sometimes green and sometimes yellow, an nually abundant on a wide range Of vegetation have for years perplexed the writer. They all resemble each other in having sensoria on the third. Fourth and Often on the fifth. Segment Of the antenna Of the winged form, in having usually three or four pairs Of caudal hairs. And in having pale cornicles and cauda in the wingless forms; but there is variation enough to make the problem whether they were one species or many a query which could not be answered until the life cycle was worked out; It was not until the summer Of 1923 that I made sure that a single species overwintering on buckthorn (rhamnus) produced winged forms in the spring that migrated to vegetable gardens and flower gardens and weeds and produced the whole number Of these troublesome summer aphids agreeing in those structural char acters just indicated. This throws the buckthorn aphid, as pro genitor for a very troublesome brood, into an economic per spective with which hitherto it has not been viewed; and makes desirable a statement with reference to its activities.

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