Typhula Blight Severity as Influenced by the Number of Preventive Fungicide Applications and Snow Compaction

Fig. 4. Typhula blight severity on an annual bluegrass fairway (Vail, CO) in April following a single fungicide application the first week in November, and just before snow cover, was compared to plots receiving a fungicide application the last week in September or the first week in October and followed by a second application the first week in November. Application rates (per 1000 ft²) were as follows: 2009-2010, a September application of the systemic fungicide vinclozolin (Curalan 50EG, BASF Corp, Research Park, NC, 1.0 oz) plus chlorothalonil (Daconil Ultrex 82.5WDG 3.2 oz) followed by a November application of the systemic fungicide pyraclostrobin (Insignia 20WG, BASF, 0.7 oz) plus the systemic fungicide triticonazole (Trinity 19.2SC, BASF, 1.0 fl oz) plus Daconil Ultrex 82.5WDG 3.2 oz or a single November application of Insignia 20WG 0.54 oz plus Trinity 19.2SC 1.0 fl oz plus Daconil Ultrex 82.5WDG 3.2 oz; 2010-2011a, a September application of chlorothalonil (Pegasus HPX, Phoenix Environmental, Valdosta, GA, 2.75 fl oz) plus propiconazole (Kestrel MEX 1.3ME, Phoenix Environmental, 2.0 fl oz) plus iprodione commercially mixed with thiophanate methyl (Dovetail 39.3EC, Phoenix Environmental, 4.0 fl oz) plus fluoxastrobin (Disarm SC, Arysta Lifescience, Cary, NC, 0.18 fl oz) followed by a November application of Pegasus HPX 2.75 fl oz plus Kestrel MEX 1.3ME 2.0 fl oz plus Dovetail 39.3EC 4.0 fl oz plus Disarm SC 0.18 fl oz or a single November application of Pegasus HPX 5.5 fl oz plus Kestrel MEX 1.3ME 4.0 fl oz plus Dovetail 39.3EC 8.0 fl oz plus Disarm SC 0.36 fl oz; 2010-2011b, a September application of the systemic fungicide trifloxystrobin (Interface 24.5SC, Bayer, 3.0 fl oz) plus triticonazole (Triton Flo 367SC, Bayer, 0.5 fl oz) followed in November by Interface 24.5SC 3.0 fl oz plus Triton Flo 367SC 0.5 fl oz or a single November application of Interface 24.5SC 6.0 fl oz plus Triton Flo 367SC 0.85 fl oz. There were no differences (P > 0.10) in Typhula blight severity between one and two fungicide applications on any date. Lines indicate standard errors.



Image from Plant Health Progress article:
Typhula Blight Severity as Influenced by the Number of Preventive Fungicide Applications and Snow Compaction