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Title: Studies on the use of fungal plant pathogens for control of Hydrilla verticillata (L.f.) Royle
Authors: Aquatic Plant Control Research Program (U.S.)
Joye, Gary F.
Cofrancesco, Alfred F.
Keywords: Biocontrol
Biological control
Fungal pathogen
Macrophomina phaseolina
Aquatic plants
Hydrilla verticillata
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Technical Report
Abstract: A survey was conducted in populations of Hydrilla verticillata (L.f.) Royle growing in lakes and rivers of the southeastern United States for the purpose of identifying plant pathogens with potential biocontrol use. An isolate of the fungus identified as Macrophomina phaseolina (Tassi) Goid. was collected from the foliage of hydrilla growing in Lake Houston, Texas. In repeated laboratory, greenhouse, and field tests, this fungus was pathogenic to hydrilla. Inoculum concentrations of between 1 x 10^4 and 1 x 10^6 colony forming units per milliliter were sufficient to kill hydrilla test plants over a 3- to 4-week period. In a field of 46 spec1es and subspecific taxa within 22 families, this fungus was pathogenic only to hydrilla and duck lettuce (Ottelia alismoides (L.) Pers.). This fungus may be useful as a biocontrol agent of hydrilla.
Appears in Collections:Technical Report

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