An investigation of "die-back" in Spartina townsendii H. & J. Groves

Abstract

An investigation of "die-back" in Spar tin a townsendii H* & J* Groves* The nature, extent, and causes of "die-back" in Spartina townsendii have "been investigated. The "die- back" areas are fringed by dying plants, whose rhizomes are soft rotted, without associated primary pathogens. Such plants recovered when brought into laboratory sand culture, and produced healthy rhizomes* An ecological survey revealed Mdie-back" extensively on the south coast; in one area on the east coast; and not at all on the west coast* It is found at relatively low levels both beside main channels and in "pans" in Spartineta* The growth, of S* towns endii has been studied in culture, and failures in tillering and rhizoming have been traced in the field* Rhizomes and tillers failed in offsets transplanted into "die-back" areas* Healthy and dying plants showed slight differences in their contents of the major mineral elements, but these were not reflected in analyses of the soils. Soil solutions from "die-back" areas supported germination of seeds; but 3* townsenail offsets, in

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