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The Control of Onion Fly, Delia antiqua (MG.), with Seed Dressings

Published online by Cambridge University Press:  10 July 2009

P. W. Carden
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Extract

Seed treatments of calomel, DDT, dieldrin and aldrin were compared in three seasons′ field trials for use against onion fly, Delia antiqua (Mg.). Excellent control and also improved germination were obtained with 0·5 oz. actual dieldrin per lb. of seed applied with a sticker, with or without thiram. Similar results were obtained with 0·1 and 1·5 oz. actual dieldrin per Ib. of seed, but 3·2 oz. reduced germination. Aldrin at the same rates gave excellent control but reduced germination. DDT at 1·5 oz. and 3·2 oz. gave good control early in the season, but was not sufficiently persistent and seriously reduced germination. Calomel gave little control, although it improved germination.

Although kerosene used as a sticker for a dust was satisfactory, it was liable to reduce germination seriously when used alone, except at very low rates.

Seed treated with DDT, dieldrin or aldrin may be stored safely for a month or two in unsealed containers but not in sealed containers.

There was close correlation between the percentage of plants attacked and the yield per 100 plants in the original stand. For every 10 per cent. of plants killed by onion fly there was a 10 per cent. loss of the potential yield.

Even where the onion-fly attack was heavy, comparatively few plants showed symptoms of damage at any one time, which suggests that the level of attack is frequently under-estimated.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 50 , Issue 4 , January 1960 , pp. 795 - 807
Copyright
Copyright © Cambridge University Press 1960

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