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Publication Type:
| Refereed |
Author(s): | Morrison, Ian N.;
Maurice, Denise C. |
Author Affiliation: | Univ. of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 |
Title: | The relative response of two foxtail (Setaria) species to diclofop |
Source: | Weed Science. Vol. 32, No. 5, September 1984, p. 686-690. |
Publishing Information: | Champaign, IL: Weed Science Society of America |
Keywords: | TIC Keywords: Spray retention; Leaf area
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Abstract/Contents: | ED50 values (the dosage required to reduce the posttreatment gain in dry weight by 50%) for diclofop applied to green and yellow foxtail at the two- and four-leaf stages were calculated from linear regression equations derived by plotting the logarithm of the applied dosage against the relative growth reduction expressed as a probit value. At the two-leaf stage, green goxtail was more susceptible to the chemical than yellow foxtail but at the four-leaf stage there was no significant difference in response of the two species. At least part of the difference in sensitivity of the two species at the two-leaf stage could be accounted for by differences in spray retention, with green foxtail retaining 1.8 times (expressed as uL/cm2) or 3.5 times (expressed as uL/g dry weight) as much spray as yellow foxtail, despite the fact that yellow foxtail had a greater projected leaf area. At the four-leaf stage, the amount of spray retained by both species calculated on a per gram dry-weight basis was significantly less than at the two-leaf stage, accounting in part for the higher ED50 values obtained at the later growth stage. However, there appeared to be no direct relationship between the amount of wpray retained and the comparative growth response of the two weeds at the later stage of application. |
Language: | English |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Morrison, I. N., and D. C. Maurice. 1984. The relative response of two foxtail (Setaria) species to diclofop. Weed Sci. 32(5):p. 686-690. |
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