ISSUE 5 June 7, 2007
During the past week (May 30-June 5), the region received rain ranging from 0.3 inch at McHenry to 3.5 inches at Oakes, based on NDAWN (North Dakota Agricultural Weather Network). Most areas in this region received greater than 2 inches of rain. For the season (April 1 to June 3), the wettest site is Oakes with 12.1 inches, which is 7.6 inches above the long-term average rainfall for the 2-month period.
Winter wheat is in the boot to heading stages, spring wheat and barley are in the tillering to early-jointing stages, and corn is in the 3- to 5-leaf stage. Planting began again on June 3 in some areas of the region while some acreage, especially in the southeast, will not be planted due to excessive water. Soybean planting is nearly completed and the majority of sunflower and dry bean acres should be completed by June 10. POST herbicide application in cool-season crops and corn continues to be a great challenge due to rain, wind and wet fields. Tan spot is common in wheat and leaf rust was found in spring wheat on June 5. Pastures and hayland are in excellent shape, but sunshine is needed to get the alfalfa crop harvested.
Wheat response to foliar fungicides
The Carrington Research Extension Center (CREC) has been conducting spring wheat fungicide trials that include early-season foliar treatments. In the trials, numerous fungicides were applied at half flowering-stage rates to tillering wheat on ground with small grain residue. The 6 site-year average of trials conducted in 2003-2006 indicate a yield increase of 2.4 bushels/acre (6 percent) with Headline applied at 3 fl oz/acre compared to Tilt at 2 fl oz/acre.
Several recent spring wheat fungicide trials conducted by the CREC have given us the opportunity to compare Folicur at 4 fl oz/A to a rate of prothioconazole (Proline) plus tebuconazole (Folicur) similar to Proline 3+3, applied at the early-flowering stage for scab suppression and control of leafspot disease. The 6 site-year average of trials conducted in 2004-2006 indicate a yield advantage of 3.5 bushels/acre (5 percent) with Proline plus Folicur compared to Folicur. Also, test weight was 0.7 lb/bu higher, leaf disease 10 percentage points less, and DON 1.4 percentage points less with Proline plus Folicur compared to Folicur.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center