EFFECTS OF REPEATED FIELD INJECTIONS OF D‐D MIXTURE AGAINST POTATO‐ROOT EEL‐WORM

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Abstract
Autumn injections of D‐D mixture have been annually repeated for three years on a silt soil at Moulton (Holland, Lincolnshire) and a black fen soil at Prickwillow (Ely, Cambridgeshire), with different results. At Moulton there was an increased yield of tubers each time D‐D was used, with no significant residual effects after the first year, and no marked long‐term effect on the eelworm population. At Prick‐willow D‐D gave an increased yield in the first season only, with no positive residual effects on yield, and an apparent stimulating effect on the eelworm population. At Moulton in 1948 and 1950 (but not in 1949) the cost of the D‐D treatment was heavily outweighed by the value of the resultant increase in crop. However, on the organic soil at Prickwillow D‐D treatment was ineffective in 1949 and 1950 and the eelworm population, initially higher than at Moulton, remained at a level inducing failure of the potato crops.

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