SUMMARY
Regression analyses of the effect of cereal cyst eelworm (Heterodera avenae Woll.) on spring‐sown wheat, barley and oats in two fields during 1963 and 1964 showed that the eelworm attack had reduced the yields of all three cereals in both years. For every ten eggs of H. avenae per g of soil before cropPl.ng there was an approximate loss of 3 cwt/acre (376 kg/ha) of oats and 1·5 cwt/acre (188 kg/ha) of wheat, but only 0·6 cwt/acre (75 kg/ha) of barley. Thus the loss of oats was about twice that of wheat and five times that of barley.
These results are compared with those of other workers some of whom used resistant cultivars or soil fumigants.
SUMMARY
An attempt was made in 1968 to reduce a wheat bulb fly population in a field in northern England by means of insecticidal seed dressings on early and late‐sown winter wheat. Ethion seed dressing reduced plant and shoot attack and also decreased the number of larvae within the plants on the late‐sown plots but not on the early‐sown. Chlorfenvin‐ phos seed dressing had no significant effect on either sowing. It is concluded that the control of wheat bulb fly populations by the use of these seed dressings on wheat crops in the previous year is not a promising means of control.
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