Accession Number : ADA134619

Title :   Aquatic Plant Control Research Program. Microbiological Control of Eurasian Watermilfoil.

Descriptive Note : Final rept.,

Corporate Author : MASSACHUSETTS UNIV AMHERST DEPT OF ENVIRONMENTAL SCIENCES

Personal Author(s) : Gunner, H B

PDF Url : ADA134619

Report Date : Jun 1983

Pagination or Media Count : 29

Abstract : Cellulolytic and pectinolytic microorganisms were isolated from the microbial populations naturally resident in the phyllosphere of Eurasian watermilfoil, Myriophyllum spicatum and of M. heterophyllum. The yield of their respective operative enzymes was maximized by growth in appropriate cellulose and pectin media; the organisms, when subsequently applied to the plants, accelerated the plants' necrosis and decline. That cellulose and pectin are particularly vulnerable target tissues in Myriophyllum spp. was confirmed by the significant increase in plant necrosis achieved over untreated controls by the simple addition of sterile cellulose and pectin media to respective test chambers. Presumably this reflected and selective stimulus provided by these substrates to the resident cellulolytic and pectinolytic microflora. A consortium of cyanobacteria associated with Myriophyllum was also found to accelerate necrosis, as did its sterile growth medium; again, presumably, as a reflection of the selective stimulus provided to the cyanobacteria in the phyllosphere. The species determination of phyllosphere residents was reflected in the significantly higher pathogenic potential of the isolates from M. spicatum to that species than to M. heterophyllum.

Descriptors :   *AQUATIC PLANTS, *BIOLOGICAL WEED CONTROL, MICROORGANISMS, BACTERIA, FUNGI, ISOLATION, CULTURES(BIOLOGY)

Subject Categories : Agricultural Engineering
      Pesticides Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE