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Laboratory and field experiments on the use of 3:5-dinitro-o-cresol and the sodium salt for winter spraying

Published online by Cambridge University Press:  27 March 2009

C. T. Gimingham  and
F. Tattersfield
C. T. Gimingham
Affiliation:
(Insecticides and Fungicides Department, Rothamsted Experimental Station, Harpenden.)
F. Tattersfield
Affiliation:
(Insecticides and Fungicides Department, Rothamsted Experimental Station, Harpenden.)
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Extract

1. The toxicity of 3:5-dinitro-o-cresol and its sodium salt to the eggs of several species of moths has been determined under laboratory conditions. Both substances are toxic to eggs of the species tested at concentrations varying from 0·1 to 0·025 per cent.

2. With eggs of some insects, hatching is not entirely prevented by the action of low concentrations of dinitro-cresol and sodium dinitrocresylate, but the majority of the larvae which emerge succumb within a few hours.

3. The eggs of “red spider” are very resistant to the action of dinitrocresol.

4. At equivalent concentrations, dinitro-cresol and sodium dinitro-cresylate have approximately the same toxicity to insect eggs.

5. Washing eggs with water after spraying has no appreciable effect on the toxicity of dinitro-cresol, if the liquid is first allowed to dry on the eggs. Sodium dinitro-cresylate is more affected by washing after spraying.

6. Field experiments on apples and black currants with spray fluids containing dinitro-cresol at a concentration of 0·25 per cent. and sodium dinitro-cresylate at equivalent concentration showed that both materials were completely effective against Psylla and Aphis eggs and greatly reduced the numbers of caterpillars. There was no evidence of any effect on Capsid eggs.

7. Both fluids had a cleansing effect on the bark of the trees, killing algae, lichens, etc.; they caused no injury to the trees themselves. The results demonstrate the practicability of using dinitro-cresol and sodium dinitro-cresylate as winter spray fluids on dormant trees and bushes under field conditions.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 17 , Issue 2 , April 1927 , pp. 162 - 180
Copyright
Copyright © Cambridge University Press 1927

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References

REFERENCES

(1)Gimingham, C. T., Massee, A. M. and Tattersfield, F. (1926). Ann. App. Biol. 13, 446.Google Scholar
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