Objective and Botanical description of the variety:
Yield potential is still the driving factor when growers determine which cultivar they are going to grow. Along with yield potential, growers also look at factors which mitigate other production risks. These include cold tolerance, disease resistance, tolerance to low pH soils, and end-use quality.
Purl is a semi-dwarf, soft white winter wheat with average plant height, early-season maturity, common head type, and white straw and glumes. Purl combines high yield potential and high test weight into a cultivar with a very good stripes rust resistance, eyespot foot rot resistance, nematode resistance, and meets end-use quality performance for export markets.
Area of adaptation and primary use of the variety:
Purl is targeted to the high (>16") rainfall production zones of Whitman County as well as Eastern and Southern Washington. It has also performed well in trials in Northern Idaho. Purl is intended to replace WB1529, WB1604, and SY Ovation, among others.
Purl would be considered cold tolerant, with a survival rate of 78% at -13C (8.6F). In comparison Artdeco survived 63%, Legion 72%, Skiles 43% and WB-528 72%.
Primary use: a soft white common cookie, cake and pastry wheat.
- Heading Date: 148 Julian days
- Plant Height: 38 inches
- Test Weight: 61.9 lbs/bu
- Seedling Emergence: Not tested, but Purl is not intended for use in the deep-furrow cropping system.
Purl has been tested in 2015 and 2016 at 13 location-years for falling numbers. Purl has been above the trial mean in all 13 of these trials. It performed similar to WB-528 and better than SY Ovation when averaged over all years and locations. The importance of tolerance to low falling number is evident by the variety SY Ovation. In 2015, SY Ovation did not show low falling numbers, mainly because the environmental conditions were not present to induce low falling numbers in this line. Consequently, in 2016, many areas of the state exhibited conditions to induce low falling number, whether through LMA or PHS. Thus, the continuous testing across environments helps identify lines which may be tolerant to low falling numbers.
Resistance to Diseases and Pests:
- Stripe Rust Resistance: In trials an infection type of 2 was shown, and disease severity of 10%. When tested at high temperatures, adult plants of Purl were resistant, or moderately resistant. This resistance is more effective in Eastern Washington than Western Washington.
- Foot Rot Resistance: In testing where foot rot has been present from natural infections (St. John, Pullman, Farmington) Purl did not show visual observations of infection. Purl has not been tested under inoculated field conditions for eyespot resistance.
- Cephalosporium Stripe: moderately resistant at late boot stage, but susceptible at early milk stage
- SBWMV: no resistance, field tests have not been done to confirm this.
- Low pH soils: moderately tolerant
- Nematodes: resistant to H. avenae, susceptible to H. filipjevi