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Timing of Fungicide Sprays for Scab Suppression
Tests in North Dakota in 1996, 1997 and 1998 compared several application timings of fungicide for scab suppression in wheat. Results indicated that application during the flowering period of the crop was most successful in reducing scab severity and in increasing yield. For example, in a test on Kulm wheat at Fargo, application of Benlate at mid-flowering reduced scab severity by 45%, while application prior to flowering, when wheat heads were half emerged, resulted in only a 11% reduction in scab severity. In tests at Carrington and at Langdon, a mid-flowering application of 0.5 lb of Benlate plus 1 lb of mancozeb resulted in an average 16.3% yield increase over the untreated check, but an earlier application, when heads began to emerge, resulted in a 9.8% yield increase, while a late application, at early milk stage, resulted in only a 1% yield increase over the untreated checks. The best timing of application of fungicides for scab suppression in wheat is early flowering! Pre-flower application of folicur in 1999 experiments did not reduce scab infestation levels while early and mid-flower application resulted in the greatest reduction of scab infection.
In barley, the crop flowers while the head is in the boot. Fungicides for scab suppression in barley should be applied very shortly after the main stem heads have emerged.
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