Wheat variety guide for Western Australia Supporting your success
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- Variety Grade Septoria nodorum blotch
- Stripe rust Leaf rust Powdery mildew
- RLN (p.neglectus) CCN Crown Rot
- Variety Grade Height
Disease update for 2015Geoff Thomas, DAFWA’s Plant Pathologist Disease incidence and severity in wheat crops is dependent on the presence of inoculum carried over from last season, favourability of seasonal conditions, pathotype virulence and varietal susceptibility. In planning which variety to grow or how to manage the variety that has been chosen, it is important to review the current disease resistance ratings found in this guide (Table 3). Being aware of disease risks to a crop allows for appropriate planning and proactive management to reduce risk of yield losses. For foliar diseases such as the rusts, yellow spot and septoria nodorum, resistance rankings and in–field management recommendations are established and well understood. For some root and crown disorders, such as root lesion nematodes and crown rot, variety tolerance and guidelines for variety selection are currently being developed or refined. For a small group of root diseases such as rhizoctonia barepatch and take–all, variety choice is not a significant management factor. Paddock surveys show that crown rot incidence is increasing across the wheatbelt. The disease was evident in many moisture stressed wheat crops in the eastern wheatbelt in the 2014 season. In paddocks with known risk of crown rot, growers should use all available management options (rotation, variety, row placement, nitrogen nutrition, sowing date). Crown rot resistance ratings for wheat varieties are included in the guide for the first time this year using data generated in eastern states’ screening trials, WA specific data will be included in future Guides. While no varieties are resistant, some varieties are less susceptible to crown rot and may provide some benefit in at–risk paddocks. For example; in DAFWA trials with high crown rot disease pressure, Emu Rock (MS) can become yield competitive with Mace (S). In 2013 a new pathotype of leaf rust was confirmed in WA. Trials in 2014 confirmed that several varieties, including Mace, are more susceptible to this pathotype and demonstrated that significant yield losses can result from infection. However no rust was reported from wheat crops during 2014 and ongoing dry summer weather indicate a low risk of leaf rust for the coming season. In the absence of confirmed establishment of this new pathotype, current ratings are presented for the previously dominant pathotype. Wheat rust samples should be sent directly to the ACRCP Annual Cereal Rust Survey, Plant Breeding Institute, Private Bag 4011, Narellan NSW 2567. For more information contact the Plant Breeding Institute +61 (0)2 9351 8800. Table 3 provides the current disease resistance ratings for wheat varieties grown in WA. Additional information on diseases and disease management can be obtained on agric.wa.gov.au/cropdisease. Table 3. Disease resistance for wheat varieties grown in WA in 2014
Disease ratings: VS = Very susceptible, SVS = Susceptible to very susceptible, S = Susceptible, MSS = Moderately susceptible to susceptible, MS = Moderately susceptible, MRMS = Moderately resistant to moderately susceptible, MR = Moderately resistant, RMR = Resistant to moderately resistant, R = Resistant. No score '-' = no rating is currently available. p = Provisional assessment. / = Scores separated by ‘/’ indicate the response to the 'currently predominant' and 'alternate' strains of stem rust existing in WA. * = Some races in eastern Australia can attack these varieties. # = May be more susceptible to the leaf rust pathotype. ( ) = Higher disease at some sites. Combined RLN ratings from DAFWA, SARDI(^), DPI Vic and DEEDI data. CCN ratings from SARDI data. Wallwork and Zwer (2013) Cereal Variety Disease Guide 2013, Factsheet Feb 2013. R=resistant - nematode numbers will decrease when this variety is grown. MR=moderately resistant - nematode numbers will slightly decrease when this variety is grown. MS=moderately susceptible - nematode numbers will slightly increase when this variety is grown. S=susceptible - nematode numbers will increase greatly when this variety is grown. Crown rot ratings from SARDI data 2009-2014 (Butt, Edmondson, and Wallwork), Qld data 2009-2014 (Bottomley, Herde, Neate, Percy, and Walters) and DPI NSW data 2013-2014 (Simpfendorfer). Table 4. Agronomic traits for wheat varieties grown in WA in 2014
Height ratings: S= short (<70cm), M=medium (70-85cm) and T=tall (>85cm). Coleoptile ratings: S=short(<60mm), M=medium (60-69mm), L=long (70-79mm), VL=very long (>79mm). Coleoptile data not updated from 2011. Black point ratings using DAFWA data 1997-2009 and 2011 data from D.Mares (University of Adelaide). Black point ratings using DAFWA data 1997-2009, 2011 data from D Mares (University of Adelaide) and 2013 H Wallward (^SARDI). Falling Number Index: germination index data has been used along with falling number from field experiments to give an indication of the likelihood of maintaining falling number after a harvest rain. 9=most likely to maintain FN, 1=least likely. Directory: sites -> gateway -> files sites -> 587 Return function, r i(X) r i(0) r i(1) r i(2) r i(3) 1 0 2 4 6 Thermal Station, I 2 0 1 5 6 3 0 3 5 6 10 sites -> Glossary for Chapter 1 Algorithm sites -> North Carolina Inclusion Initiative Mapping Where Children with ieps are Being Served Purpose sites -> Northern England’s set-jetting locations sites -> Physical custody of 1033 program property accountibility form statement of Physical Custody: By signing for the below 1033 property I am a Law Enforcement Officer of the aforementioned Law Enforcement Agency sites -> Nstructions for Acquiring Excess Equipment online, through the 1033 Program sites -> Memorandum of agreement Download 1.18 Mb. Share with your friends:
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