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| Publication Type:
| Report |
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| Author(s): | Worf, G. L.;
Lee, M. |
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| Author Affiliation: | Department of Plant Pathology, University of Wisconsin-Madison |
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| Title: | Control of Anthracnose and Poa Decline, 1987 |
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| Source: | Fungicide and Nematicide Tests. Vol. 43, 1988, p. 251. |
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| Publishing Information: | St. Paul: American Phytopathological Society |
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| Keywords: | TIC Keywords: Anthracnose; Poa annua; Phytotoxicity
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| Abstract/Contents: | Daconil formulations and Bayleton, either alone or in rotation, were evaluated at 14-day intervals. Several other chemicals and combinations were compared at 21-day intervals. The trial was conducted on a golf course fairway consisting primarily of Poa annua with a history of anthracnose and Poa decline. Plots were arranged in a randomized complete block design consisting of three replications, each 10 x 20 ft. in size. Applications were made with a CO2-powered sprayer equipped with two 8006 TeeJet nozzles, operating at 50 psi, and delivering 2 gal/1000 sq. ft. Applications at 14-day intervals were made on 15 and 29 Jun, 13 and 30 Jul. Applications on 21-day intervals occurred on 15 Jun, 6 and 30 Jul. Modest turf decline was present at the time of initial treatments due to drouth and disease. Unseasonably high temperatures prevailed throughout the trial period. Disease severity was determined by a visual reading from 0 to 5. Fungal sporulation and setae were ovserved by examination of three sambles/replication and rating: 0 = not present; 1 = present only on dead, lower leaves; 2 = some lesions and structures on green foliage; 3 = substantial lesions and many structures, and 4 = abundance of both structures and lesions on foliage. A table shows the results for 23 Jul. Only the first four treatments in the Table significantly improved turf health. The combination of Daconil + SDS 66533 was highly effective. When in rotation with Bayleton, control was better when Daconil was the first product applied, presumably because the disease was already active by the first application date, and Bayleton, was ineffective under this circumstance. Other promising products included PP 523, Prochloraz and Banner. Bayleton, Rubigan and SN 596 were ineffective, while Spotless results were indefinite. There was a fairly low correlation of 0.44 between turf health and quantity of Colletotrichum fruiting structures. The major discrepancy was with Rubigan. Fruiting was controlled well, but turf health was poor. This may have been due to dome phytotoxicity. For most of the other fungicides, except Spotless, there appeared to be a positive relationship between turf health and prevention of Colletotrichum sporulation. |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Worf, G. L., and M. Lee. 1988. Control of Anthracnose and Poa Decline, 1987. Fungicide Nematicide Tests. 43:p. 251. |
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