The Breeding of Lines of Agrostis tenuis Sibth. and Festuca rubra L. Tolerant of Grass-killing Herbicides1
- R. Fisher and
- C. E. Wright
Cultivars of amenity grasses which are tolerant of herbicides for weed grasses would facilitate the selective removal of undesirable weed grasses from turf, sod, and seed fields of these cultivars. In an unsuccessful attempt to select 1, 1′-dimethyl-4,4′ -bipyridinium ion (paraquat)-tolerant red fescue (Festuca rubra L. ssp. rubra) genotypes, plants of five different ages were sprayed with paraquat. The most tolerant plants were then selected. When paraquat was applied again several months later to these “tolerant” plants, and to unselected plants, there was no significant difference in tolerance between the selected and unselected plants.
The selection of colonial bentgrass (Agrostis tenuis Sibth.) and Chewings fescue (F. rubra ssp. commutata Gaud.) lines tolerant of herbicide IRS resulted in a line of colonial bentgrass which was 2.5 times more tolerant than unselected ‘Bardot’ colonial bentgrass and a line of Chewings fescue 1.8 times more tolerant than unselected ‘Highlight’ Chewings fescue. The level of tolerance already obtained in the colonial bentgrass line should permit the selective removal of annual bluegrass (Poa annua L.) from swards of this line, but a further increase in tolerance would probably be required before it would be possible to eliminate other undesirable grass species.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1980. . Copyright © 1980 by the American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, and International Turfgrass Society, 5585 Guilford Rd., Madison, WI 53711 USA