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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Crowley, R. H. |
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| Author Affiliation: | Mycogen Corporation, San Diego, CA |
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| Title: | Control of annual bluegrass (Poa annua var. annua) in southern turf with the biological xanthomonas campestris pv poannua |
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| Meeting Info.: | Little Rock, AR; January 21-22, 1992 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 45, January 1992, p. 127. |
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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; Biological control; Xanthomonas campestris
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| Abstract/Contents: | "Field experiments were conducted in SC, FL, LA, TX and CA in 1991 to evaluate the efficacy of Xanthomonas campestris var. poannua as a biological control of seeded or natural stands of annual bluegrass in turf. Xanthomonas campestris pv poannua was applied at rates of 10(6), 10(7), 10(8), and 10(9) colony forming units (cfu)/ml to plots about 2.0 by 3.0 m in 935 l/ha and replicated three or four times in an RCB design. Treatments were applied three times at two week intervals except in two experiments where some treatments were applied only once. Annual bluegrass control was visually estimated at about 28, 42, 63 and 84 days after initial application. The best method to visualize control was to allow the turf to grow several days without mowing, this allowed seedheads to emerge from the annual bluegrass thus making comparison to untreated controls more reliable. Rate responses were observed in all eight experiments with 10(6), and 10(7) cfu/ml providing similiar but unacceptable control of annual bluegrassd at the late rating dates (32 and 40 percent control at 28-77 DAT, respectively). However, rates of 10(8), and 10(9) cfu/ml gave similar and acceptable control of annual bluegrass at late rating dates (74 and 86 percent control 28-77 DAT, respectively). Comparison of single verses multiple applications indicated that a single application would ultimately control annual bluegrass acceptably but that multiple applications resulted in more rapid and consistent decline of the annual bluegrass. When experiments were initiated at different dates in March the later initiation dates which had warmer average temperatures resulted in more rapid control of annual bluegrass. Additional research will be required to refine application timing and rates to optimize control of annual bluegrass in managed turf with this biological method." |
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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):
Crowley, R. H. 1992. Control of annual bluegrass (Poa annua var. annua) in southern turf with the biological xanthomonas campestris pv poannua. South. Weed Sci. Soc. Proc. 45:p. 127. |
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MSU catalog number: SB 611 .S6 |
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