Full TGIF Record # 63098
Item 1 of 1
Publication Type:
i
Report
Author(s):Dykema, N. M.; Vargas, J. M. Jr.
Author Affiliation:Department of Botany and Plant Pathology, Michigan State University, E. Lansing, MI
Title:Evaluation of fungicides for control of summer decline in annual bluegrass, 1998
Source:Fungicide and Nematicide Tests. Vol. 54, 1999, p. 476.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:1
Keywords:TIC Keywords: Poa annua; Pythium root rot; Dollar spot; Sclerotinia homoeocarpa; Fungicide evaluation; Disease control; Metiram; Chlorothalonil; Fosetyl Al; Tank mix; Disease severity; Quality; Plant density; Color
Abstract/Contents:"This test was conducted at the Hancock Turfgrass Research Center, E. Lansing, MI. Plots were mowed at 1.3 cm and fertilized monthly with 0.5 lb nitrogen per 1000 sq. ft. The soil type was sandy loam composed of 67% sand, 19% silt, and 13% clay. Daily temperatures ranged from 16 - 33° C and night temperatures ranged from 2 - 19° C from June through August. Fungicide treatments were applied to 2 ft X 4.5 ft plots arranged in a randomized complete block design with four replications. Applications were made using a hand held CO₂-powered back pack sprayer at 36 psi with a single 8002E flat fan TeeJet nozzle at a rate of 1.1 gal per 1000 sq. ft. All fungicide treatments were initiated on 6 Jul and applied on a 14 day interval until 12 Aug. Turf quality evaluations were based on turf density and color where 0=dead and 10=excellent. Dollar spot ratings were visual estimations of % plot area with dollar spot symptoms. Data were subjected to analysis of variance and LSD test, p=0.05. Weather conditions during this study were typical for a Michigan summer. The etiology of "summer decline" is not well understood and there are currently no pathogens associated with this problem thus far. Combinations of Chipco Aliette Signature 80 WDG with Chipco 26GT 2F, Daconil Ultrex 82.5 WDG, EXP 80318C provided sigificantly better turf quality than untreated controls for the entire duration of the study. Dollar spot developed in Jul and exhibited 91% disease in controls in Aug. All Chipco Aliette Signature combinations tested provided significant dollar spot control when compared to the untreated control, as did the Aliette T&O + Thalonil 4L combination. By Aug 11, control with a tank mix of Dithane and Chipco Aliette Signature was superior to either product alone, demonstrating the synergy of the two products. No phytotoxicity was observed."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dykema, N. M., and J. M. Jr. Vargas. 1999. Evaluation of fungicides for control of summer decline in annual bluegrass, 1998. Fungicide Nematicide Tests. 54:p. 476.
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