C. R. Thompson, M. J. Dial, and D. C. Thill
1992 Res. Prog. Rep. West Soc. Weed Sci.Poverty, ripgut, and downy brome (
Bromus species) control were evaluated in winter wheat south of Lewiston, Idaho in the Tammany area. Preplant surface (PPS) treatments were applied on November 1, 1990, ‘Hawk’ hard red winter wheat was seeded at 105 lb/a on November 2, and postplant surface (POPES) treatments were applied on November 3. Spring postemergence treatments were applied to 3.5 to 4-leaf (lf) wheat, 1 to 3-tiller Bromus species, and 1 to 3-in. pinnate tansymustard (DESPI) and bur chervil (ANRCA) on April 2, 1991 (Table 1). All treatments were applied with a CO
2 pressurized backpack sprayer calibrated to deliver 10 gal/a at 3 mph. The fall (PPS and POPES) treatments were applied with 80015 nozzles and 20 psi and the spring treatments were applied with 8001 nozzles and 40 psi. Treatments were arranged in a randomized complete block design and replicated four times. Plots were 10 by 30 ft. Wheat injury and brome control were evaluated visually on April 29 and brome and broadleaf weed control were evaluated visually on May 24. Grain was harvested with a small plot combine from a 4.5 by 27 ft area on August 9.
Table 1. Applications and soil analysis data
| Application timingTemperature (F)Soil Temperature at 2 in. (F)Relative humidity (%)
Wind speed (mph) – direction
Soil pH
OM (%)
CEC (meq/100 g soil)
Texture |
PPS444660
2-S |
5.3
3.7
25.3
silt loam |
POPES383668
5-S |
3 lf505073
5-S |