Full TGIF Record # 24490
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Publication Type:
i
Report
Author(s):Dernoeden, P. H.; Krouse, J. M.
Author Affiliation:Dept. of Agronomy, University of Maryland, College Park, MD
Title:Spring green-up and spring dead spot as influnenced by fall applied fungicides, 1991
Source:Fungicide and Nematicide Tests. Vol. 47, 1992, p. 292.
Publishing Information:St. Paul, MN: American Phytopathological Society
Keywords:TIC Keywords: Spring green-up; Spring dead spot; Autumn; Fungicides
Abstract/Contents:"Fungicides were applied 17 Sep 1990 in 5.0 gal. water per 1000ft2 with a CO2 pressurized (36 psi) sprayer. The RP EXP 10064B sequential treatment was applied 1 May 1991 at <5% Tufcote green-up. Frost resulted in Tufcote becoming completely dormant by 31 Oct 1990. Plots were 5 by 10 ft, and were arranged in a randomized complete block with four replications. Soil was a Sassafrass sandy loam with a pH of 6.9 and 1.5% OM. Percent of plot area green data provide on early means of assessing potential SDS injury. The ratings reflect both dormancy and actual spring dead spot (SDS) and therefore higher ratings suggest less SDS injury. Percent of plot area green or SDS was determined visually on a 0 to 100% scale where 0 = entire plot area dormant or dead, and 100 = entire plot area green and healthy. Overall quality was assessed on a 0 to 10 scale where 0 = entire plot area brown or dead, and 10 = optimum density and greeness. Spring dead spot was moderately severe, but injured Tufcote rapidly recovered in response to very high temperatures beginning on 9 May and persisting into June. Percent of plot area green data collected on 17 May suggested improved green-up with Sentinel, and this was substantiated on 24 May. Data from 24 May showed that Sentinel had enhanced spring green-up significantly when compared to untreated turf, which indicated that it will alleviate SDS. Percent area dormant plus SDS data collected 4 Jun revealed that Sentinel, Chipco 26019, and RP EXP 10064 (1.5 and 3.0 fl.oz.) had reduced disease significantly. Rubigan and Lynx, which were the standards of comparison for this study, provided no enhanced green-up or reduced SDS effects. While there were few statistical differences in overall quality (4 June) among fungicide-treated plots, Sentinel, Chipco 26019 (4.0 fl.oz.), and RP EXP 10064B (3.0 fl.oz.) were associated with improved quality when compared to untreated plots."
Language:English
References:0
Note:Table
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., and J. M. Krouse. 1992. Spring green-up and spring dead spot as influnenced by fall applied fungicides, 1991. Fungicide Nematicide Tests. 47:p. 292.
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