Full TGIF Record # 240465
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Publication Type:
Author(s):Murphy, W. J.; Fletchall, O. H.; Peters, E. J.
Author Affiliation:University of Missouri, Columbia, Missouri
Title:Effects of 2,4-D and related compounds on seedling grasses
Meeting Info.:St. Louis, Missouri: December 11-13, 1961
Source:Eighteenth Annual Research Report: North Central Weed Control Conference. 1961, p. 75-76.
# of Pages:2
Publishing Information:[Lincoln, Nebraska]: [North Central Weed Science Society]
Abstract/Contents:"Seedling Kentucky bluegrass, orchardgrass, tall fescue, and timothy were studied in the greenhouse and field using different types, rates and dates of treatment with phenoxy compounds. Greenhouse treatments under weed-free conditions consisted of spray applications of ½, 3/4, and 1 lb/A of the dimethylamine salt of 2,4-D and 3/4 and 1-1/2 lb/A of the dimethylamine salt of 4-(2,4-DB) in 40 gallons of water applied 3 weeks and 6 weeks after seedling emergence. Treatments were made 3 weeks following emergence resulted in slight to moderate damage, while those made 6 weeks following emergence gave no apparent injury. Recovery occurred in all cases. Air dry weights of top growth harvested 5 weeks after treatment showed no statistically significant differences between rates of application or between treatments and the checks. Kentucky bluegrass exhibited the greatest damage, followed in order by orchardgrass, timothy, and tall fescue. Damage was greater as rates increased. Effects of 3/4 lb/A of 4-(2,4-DB) were about equal to ½ lb/A 2,4-D. The 1-1/2 lb/A rate of 4-(2,4-DB) gave damage ratings comparable to 3/4 lb/A of 2,4-D. Spring seedings in the field were treated with ½ lb. and 1 lb/A of the dimethylamine salt of 2,4-D, 1-1/2 lb/A of the dimethylamine salt of 4-(2,4-DB), and ½ lb. and 1 lb/A of the butyl ester of 2,4-D applied 2, 4, and 6 weeks after emergence of the grasses. A natural infestation of weeds occurred. Slight to moderately heavy damage to the seedling grasses resulted from the treatments at the first date, very slight to moderately light damage at the second date, and no visible effect at the third date. Kentucky bluegrass was most affected, orchardgrass was next, and timothy and fescue appeared equal. ½ lb/A of 2,4-D amine gave the least damage, 1-1/2 lb/A of 2,4-DB was next, 1 lb/A 2,4-D amine and ½ lb/A 2,4-D ester were nearly equal and 1 lb/A 2,4-D ester showed most damage. All treatments at all dates gave effective control of broadleaved weeds (principally smartweeds, ragweeds and lambsquarter). Damaged grass seedlings made rapid recovery during the favorable season. Point quadrat readings of seedling grass taken 40 days after final treatment showed only small differences between rates, dates, or types of treatment, but treated plots in general had significantly higher readings than checks. Kentucky bluegrass showed less difference between treatments and checks than the other grasses."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Murphy, W. J., O. H. Fletchall, and E. J. Peters. 1961. Effects of 2,4-D and related compounds on seedling grasses. Proc. North Cent. Weed Sci. Soc. p. 75-76.
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MSU catalog number: SB 610 .N6
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