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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Isgrigg, J. III;
Yelverton, F. H. |
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| Author Affiliation: | Crop Science Department, North Carolina State University, Raleigh, NC 27695 |
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| Title: | Evaluation of a suspected DNA resistant biotype of annual bluegrass (Poa Annua L.) |
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| Section: | Weed management in turf, pastures and rangeland
Other records with the "Weed management in turf, pastures and rangeland" Section
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| Meeting Info.: | 52nd Annual Meeting, Greensboro, NC, January 25-27, 1999 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 52, 1999, p. 73. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Poa annua; Dinitroaniline herbicides; Root growth; Shoot growth; Prodiamine; Pendimethalin; Oxadiazon; Pronamide; Herbicide evaluation; Biotypes; Herbicide resistance; Eleusine indica; Weed control
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| Abstract/Contents: | "Growth chamber studies were conducted in 1998 to evaluate suspected resistance of an annual bluegrass biotype to dinitroaniline (DNA) herbicides. After a 21 day period of growth, suspected resistant and known susceptible annual bluegrass biotypes were evaluated for root and shoot growth as affected by treatment with solutions containing varying concentrations of prodiamine, pendimethalin, oxadiazon, and pronamide. Seed was counted at 20 each and placed in 65 x 15 mm round petri dishes between 2 discs of Watmann #1 filter paper. Herbicide solutions were prepared using deionized water and concentrations ranged from 1:M to 0.1M and 20 ml of this solution was pipetted onto the filter paper containing the seed. The prepared petri dishes were placed into a growth chamber maintained at 20 °C with a 14 hour light period. The filter paper was kept moist with the addition of 2.5 ml deionized water twice weekly. Seed was allowed to grow for 21 days then roots and shoots were separated and measured. Treatments were arranged as a factorial with checks and 4 replications. The experiment was repeated. Observed I₈₀ values were calculated subjected to ANOVA using the General Linear Model procedure. Means were separated using the Fishers' Protected LSD procedure. Predicted dose-response curves wer developed using non-linear regression with shoot data being fitted to a Gompertz model while root data were fitted to a Logistic model. Biotype response to oxadiazon concentration was similar for shoot growth inhibition with an I₈₀ R/S ratio of 1. Root growth response indicates the resistant biotype is more sensitive to oxadiazon compared to the susceptible biotype with an I₈₀ R/S ratio of 0.6. Pronamide inhibited growth parameters of both species >90% at any rate tested. The resistant biotype was less sensitive to pendimethalin with I₈₀ R/S ratios of 2.3 for shoot growth and 2.7 fro root growth. Resistance to DNA herbicides was more pronounced with respect to prodiamine sensitivity with I₈₀ R/S for shoot and root growth at 105 and 12.7 respectively. Predicted dose-response curves were consistent with other research on DNA resistant goosegrass [Eleusine indica (L.) Gaertin.] with > than a two fold tolerance to DNA herbicides with increased sensitivity to herbicides with other modes of action. R² values were significant for all fitted dose-response curves. These data indicate pronamide and oxadiazon can be effectively used in weed management programs for control of DNA resistant populations of annual bluegrass". |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Isgrigg, J. III, and F. H. Yelverton. 1999. Evaluation of a suspected DNA resistant biotype of annual bluegrass (Poa Annua L.). South. Weed Sci. Soc. Proc. 52:p. 73. |
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