Full TGIF Record # 240284
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Publication Type:
Author(s):Beard, J. B.; Daniel, W. H.
Author Affiliation:Department of Agronomy, Purdue University, Lafayette, Indiana
Title:Post-emergence crabgrass control studies
Section:Weed control in turf
Other records with the "Weed control in turf" Section
Meeting Info.:Omaha, Nebraska: December 5-8, 1955
Source:Twelfth Annual Research Report: North Central Weed ControlConference. 1958, p. 37.
# of Pages:1
Publishing Information:[Lincoln, Nebraska]: [North Central Weed Science Society]
Keywords:TIC Keywords: Amine methanearsenate; Crabgrass control; Disodium methyl arsenate; Fungicide evaluation; MAA; Postemergence weed control; pH
Trade Names:AMA
Abstract/Contents:"Extensive post-emergence crabgrass control studies have been conducted at Purdue University over the last four years. These tests have encompassed 34 compounds in 13 individual studies. Tests in 1954, 1955 and 1956 indicated that disodium salt of MAA (DMA) to be the most effective and safest crabgrass control chemical currently available at that time for widespread homeowner use. In 1957 studies were initiated to evaluate other materials which might give faster control and might require only one application. These tests proved 8 related organic arsenicals to be superior in activity to DMA. Of these 8 the mono-octyl ammonium salt of MAA (AMA) was found to be the best. It gave a faster and a more positive control, but it still required two applications. A later study was conducted to determine what effect varying the pH of the DMA formulation would have on its crabgrass control properties. Varying the pH was shown to be if little benefit and a pH of 4 or lower decreased the toxic action of the DMA considerably. Also, it was found that mixing wetting agents into the DMA formulation was of little benefit. Tests were carried out to determine the proper number of applications and intervals between application of AMA and DMA required at both the 5 and 10 lb/A rates to give the maximum crabgrass control. The number of applications ranged from 1 to 4 with intervals between applications of 1, 2, 4, and 8 days. The best and fastest crabgrass control with both materials and both rates was obtained with 2 applications at a 5 to 7 day interval. In the summer of 1958 further investigations were made concerning various formulations of AMA and DMA. It was found that mixtures of 75% t-nonyl AMA plus 25% dodecyl AMA at 10 lb/A and 50% t-nonyl AMA plus 50% dodecyl AMA at 10 lb/A gave equal but not better control than standard AMA alone. It was also shown that AMA in a dry form at 10 lb/A gave much faster control than DMA in a dry form at 10 lb/A. Both required two applications but the dry AMA form gave a much quicker discoloration and browning of crabgrass with no damage to the desirable bluegrass. Four new experimental materials were also tested in the summer of 1958. Two of them did not give as good a control as standard AMA or DMA. The other two materials have shown some promising characteristics. This past summer's findings indicate that the dry AMA formulation warrants further study due to its more rapid killing properties. Also, the two new materials should be investigated more thoroughly because of their fast action. As yet we have not found a material which can be consistently used as a one-application eradicant of crabgrass."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Beard, J. B., and W. H. Daniel. 1958. Post-emergence crabgrass control studies. Proc. North Cent. Weed Sci. Soc. p. 37.
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