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The Effect of Mercury Vapour on the Eggs of Calandra granaria (L.) (Col., Curculionidae)

Published online by Cambridge University Press:  10 July 2009

O. W. Richards
O. W. Richards
Affiliation:
Imperial College of Science and Technology.
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Extract

1. To determine the percentage hatch of Calandra granaria eggs, the grain containing them should be kept for 6–10 days at 25°C. after a two-day oviposition period.

2. Pretreatment of grain with mercury vapour makes no difference to the fertility of eggs afterwards laid in it.

3. At 25°C. 99 per cent. of the eggs are sterilised in 24 hours and 87 per cent. in 8 hours, using what probably approaches the saturated vapour.

4. At 10°C., the sterilisation for periods of 24, 48, and 72 hours is 44, 87 and 93 per cent. respectively.

5. At 25°C., mercury vapour will penetrate at least 30 cm. of grain in 2 days. At 12°C., mercury vapour will penetrate at least 90 cm. of grain in 7 days.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 36 , Issue 3 , September 1946 , pp. 283 - 290
Copyright
Copyright © Cambridge University Press 1946

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References

Wright, D. W. (1944). Mercury as a control for stored grain pests.—Bull. ent. Res., 35, pp. 143–160, 1 fig.CrossRefGoogle Scholar