Abstract
SUMMARYThe hatch of beet eelworm (Heterodera schachtii Schm.) larvae from cysts in 0–1% aqueous solutions of rivanol (3,9‐diamino‐7‐ethoxyacridine lactate) was greatest and fastest in 1 % rivanol, which also inhibited the growth of micro‐organisms. The hatching effect of rivanol was specific to beet eelworm out of five Heterodera species tested. Larval hatch from cysts on nylon sieves at the surface of 1% rivanol was not lessened by a thin layer of debris, nor was hatch affected by soil storage and drying times except with new cysts.Measuring the density of beet eelworm infestations in fields by larval hatch in rivanol would avoid errors from inclusion of related species, observer bias, and difficulties of determining viability. The number of cysts used could easily be increased to help reduce sampling errors.
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