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Larvae of the pea and bean weevil, Sitona lineatus, and the yield of field beans

Published online by Cambridge University Press:  27 March 2009

R. Bardner
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire
K. E. Fletcher
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire

Summary

In 16 experiments with field beans at Rothamsted, Woburn and Saxmundham between 1969 and 1976, seed-bed applications to the soil of dieldrin or γ-HCH were used to control subsequent infestations of the roots by larvae of Sitona lineatus. Rates of between 1·12 and 4·48 kg a.i./ha were used. Larval populations on untreated plots plots were variable, but 70–80% control was usually given by rates of 2·24–4·48 kg a.i./ha. Insecticides nearly always increased yields, the mean increase for all treatments being 0·15 t/ha, but a maximum yield response of over 0·5t/ha was achieved. It is suggested that the importance of S. lineatua larvae as pests of field beans in Britain has been under-rated.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1979

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