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The Seasonal Emergence of Larvae From Cysts of the Beet Eelworm, Heterodera Schachtii Schmidt *)

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For more content, see Nematology.

Field experiments in 1954 and 1955 showed that there was a high rate of larval emergence from cysts of the beet eelworm during April and May followed by a low emergence rate from June to September. It is shown that low soil moisture content was probably the chief factor inhibiting emergence during the summer months. Larval emergence probably does not occur in soil where the pressure deficiency exceeds 150 cm of water. Recordings of pressure deficiency in 4 soil types during 1955 showed that from June to September the pressure deficiency was mostly above this level. A comparison of larval emergence from cysts within and between soil crumbs was made. At least 50 per cent of the cyst population occurred within crumbs, but the rate of larval emergence from these cysts was very low. It is suggested that when counts of cyst contents in soil are made, a dispersing agent such as "Calgon" should be used to release cysts enclosed in soil crumbs.

Affiliations: 1: School of Agriculture, University of Cambridge (Now at Nematology Depart-ment, Rothamsted Experimental Station, Harpenden


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