Laboratory and Field Studies on Aquatic Weeds; Investigations of Algaecidal and Herbicidal Materials and Aquatic Environments

摘要

Progress of various laboratory and field studies concerned with submersed aquatic weed problems are covered. Results summarized are considered preliminary and not conclusive and generally require further investigation. Laboratory culture of filamentous algae and algaecidal evaluation techniques are described, including results of evaluation tests on compounds. Results of herbicidal evaluation tests of new herbicidal compounds and specification performance tests of aromatic solvent herbicides and emulsifiers are reported. Repeated applications of aromatic solvent treatments on pondweeds are shown to influence the growth and production of pondweed vegetative propagules. Tests on the fluence of water quality on the herbicidal effectiveness of aquatic herbicide acrolein have shown negligible effects on pondweed response. Pondweeds grown and treated in both flowing and standing water combinations were studied from the standpoint of growth and herbicidal response to aromatic solvent treatments. Certain plants grown and treaeeated in flowing water exhibited reduced injury to pondweeds as compared to that produced in standing water. (Author)