Rust
Puccinia sp.
| Contributor: | CABI |
| Date Compiled: | 2024 |
Prevention
| Solution | Risk resistance (FRAC Code) |
|---|---|
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Sow 7-10 days later than ordinary, to avoid the rust spores spreading period (The spores can only infect after 3 leaf-stage of seedling)
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Low risk (M01)
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Crop density (about 270 plants/m2)
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High risk (11)
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Reasonably fertilize with less nitrogen and more phosphate and potash, to make the plant less susceptible.
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High risk (11)
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Intercrop from plot to plot, or rotate with alternative crops, such as cabbage, potato, rape, and maize
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Plough after harvest, to eradicate (manually) the over-summer host
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Uproot volunteer seedlings
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Resistance varieties in Sichuan province include Neimai No.8, Chuanmai No.32, Chuanmai No.36, Chuanmai No.39, Chuanmai No.42, Chuanqing No.16, Chuanqing No.19, Chuannong No.7、Chuannong No.11, Chuannong No.16, Chuannong No.18, Chuannong No.19, Miannong No.7, Mianyang No.3, Mianyang No.35, Mianyang No.37, Rongmai No.2
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Monitoring
| Solution |
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Visit the wheat field every 7 days to observe the wheat health until milk stage or until the disease is not become a serious problem.
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Choose five-points (2m2 per point) bidiagonally in 1 piece of small wheat field (about 1/4 ha), then check 20 to 50 leaves at each point
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Check for leaves with yellow rust spot lines; estimate coverage of rust on leaf to assess severity levels D = 1%, 5%, 10%, 20%, 40%, 60%, 80%, 100%); then, calculate the diseased leaf rate (F=diseased leaf number/observed leaf number) = disease index (I): I=F x D x 100
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For later stages, consider control action when disease index (I) over 5.
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At milking and ripening stage, control is too late.
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Control
| Solution | Product Category | Application Details and Notes (commercial product example) |
|---|---|---|
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Sophora flavescens extracts
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Biological fungicide
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Spray plant extracts such as Sophora flavescens (buy in pharmacy), at a dosage of 10 mg/ml, 30 L/667m2, once a week from jointing to grouting stage of wheat.
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Cecidomyiidae beetles
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Parasite
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Potential natural enemy, one kind of Cecidomyiidae beetles, with larvae feeding on rust spores of wheat stem rust disease. So use fewer insecticides to protect this natural enemy.
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Regulations surrounding chemical products can change rapidly – always verify chemicals recommended here with the most recent legislation and lists of products registered for your country
| Solution | Product Category | Application Details and Notes (commercial product example) |
|---|---|---|
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Triadimefon (seed dressing)
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Synthetic fungicide
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Seed dressing with triadimefon-based products (2% missible oil, effective ingredient 40-80g/100kg seed) before sowing could postpone disease occurring date for 30-60 days. Alternative fungicides such as tebuconazole, paclobutrazol, propiconazole-based products could be rotated for use, but follow label instructions and regulations
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Hexaconazole
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Synthetic fungicide
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Spraying on leaves in the disease center or all over the field with hexaconazole-based products (30% suspending agent, effective ingredient 36-54g/ha) before milking stage of wheat.
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The information made available here has been obtained from or is based upon sources believed by CABI to be reliable but is not guaranteed as to accuracy or completeness. Anyone acting or relying on such information does so entirely at their own risk. The efficacy of the IPM methods included above will depend on local conditions and might not always be suitable everywhere within the specified country.