Abstract
RECENT papers have stressed two of the problems that arise in the design of field trials when insecticides are employed. McKinlay1 noted that the protection of a crop afforded by the use of insecticide may be partially vitiated by re-invasion of insects from adjacent unsprayed plots. The converse of this situation was mentioned by Joyce2, who pointed out that in the Sudan Gezira “the insect regime on unsprayed cotton may have been [so] affected by the wide-scale application of insecticide upon surrounding cotton”.
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References
McKinlay, K. S., Nature, 171, 658 (1953).
Joyce, R. J. V., F.A.O. Plant Prot. Bull., 3 (6), 86 (1955).
Joyce, R. J. V., Ann. Rep. of Res. Div., Min. of Agric, Sudan Govt., 1949–50, p. 92.
Pearson, E. O., Proc. 6th Symp. Colston Res. Soc., Univ. Bristol Pub. (Butterworth, London, 1954).
De Bach, P., and Bartlett, B., J. Econ. Ent., 44, 373 (1951).
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JOYCE, R. Insect Mobility and Design of Field Experiments. Nature 177, 282–283 (1956). https://doi.org/10.1038/177282a0
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DOI: https://doi.org/10.1038/177282a0
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