Field Pea Blackspot Management Guide is a location and season specific weekly forecast. It accounts for varietal resistance and chemical options, agronomic yield potentials, agronomic constraints (frost and terminal drought), risks of spores showers, disease severity, and disease related yield loss. It then weighs agronomic yield loss and disease yield loss and suggests a window of sowing dates. Field pea crops should be sown so that the majority of blackspot spores (approximately 60%) have been released prior to the crop emergence.
This prediction is based on DPIRD's Blackspot Manager model using weather data from 1 January 2018 to 9 May 2018 from the nearest weather station.
Sowing recommendations are a combination of blackspot risk and field pea agronomic considerations.
Key to blackspot severity scores
| Blackspot risk | Five out of 10 years | Three out of 10 years | One out of 10 years |
|---|---|---|---|
| Low | 2 | 5 | 15 |
| Medium | 20 | 25 | 35 |
| High | 25 | 30 | 50 |
Boyup Brook
Rainfall to date: 100mm. Days with significant stubble moisture: 34
| 8 May | 15 May | 22 May |
|---|---|---|
| 19% spore released - blackspot risk high | 31% spore released - blackspot risk medium | 48% spore released - blackspot risk medium |
| Do not sow | Do not sow | Do not sow |
Dowerin
Rainfall to date: 46.3mm. Days with significant stubble moisture: 23
| 8 May | 15 May | 22 May |
|---|---|---|
| 3% spore released - blackspot risk high | 10% spore released - blackspot risk high | 23% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Katanning
Rainfall to date: 81mm. Days with significant stubble moisture: 29
| 8 May | 15 May | 22 May |
|---|---|---|
| 10% spore released - blackspot risk high | 19% spore released - blackspot risk high | 34% spore released - blackspot risk medium |
| Do not sow | Do not sow | Do not sow |
Kojonup
Rainfall to date: 78.9mm. Days with significant stubble moisture: 37
| 8 May | 15 May | 22 May |
|---|---|---|
| 25% spore released - blackspot risk high | 38% spore released - blackspot risk medium | 55% spore released - blackspot risk medium |
| Do not sow | Do not sow | Sow – do not sow dry |
Kondinin
Rainfall to date: 89.6mm. Days with significant stubble moisture: 33
| 8 May | 15 May | 22 May |
|---|---|---|
| 17% spore released - blackspot risk high | 29% spore released - blackspot risk high | 46% spore released - blackspot risk medium |
| Do not sow | Do not sow | Sow – do not sow dry |
Lake King
Rainfall to date: 69mm. Days with significant stubble moisture: 44
| 8 May | 15 May | 22 May |
|---|---|---|
| 41% spore released - blackspot risk medium | 55% spore released - blackspot risk medium | 70% spore released - blackspot risk low |
| Sow – do not sow dry | Sow – do not sow dry | Sow – do not sow dry |
Merredin
Rainfall to date: 60.8mm. Days with significant stubble moisture: 23
| 8 May | 15 May | 22 May |
|---|---|---|
| 3% spore released - blackspot risk high | 10% spore released - blackspot risk high | 23% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Mingenew
Rainfall to date: 85.1mm. Days with significant stubble moisture: 17
| 8 May | 15 May | 22 May |
|---|---|---|
| 0% spore released - blackspot risk high | 3% spore released - blackspot risk high | 12% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Moora
Rainfall to date: 74.5mm. Days with significant stubble moisture: 21
| 8 May | 15 May | 22 May |
|---|---|---|
| 2% spore released - blackspot risk high | 9% spore released - blackspot risk high | 21% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Mt Barker WA
Rainfall to date: 76.9mm. Days with significant stubble moisture: 50
| 8 May | 15 May | 22 May |
|---|---|---|
| 55% spore released - blackspot risk medium | 70% spore released - blackspot risk low | 82% spore released - blackspot risk low |
| Do not sow | Do not sow – not suited agronomically | Sow – do not sow dry |
Mullewa
Rainfall to date: 88.3mm. Days with significant stubble moisture: 21
| 8 May | 15 May | 22 May |
|---|---|---|
| 2% spore released - blackspot risk high | 7% spore released - blackspot risk high | 19% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Newdegate
Rainfall to date: 50mm. Days with significant stubble moisture: 36
| 8 May | 15 May | 22 May |
|---|---|---|
| 23% spore released - blackspot risk high | 36% spore released - blackspot risk medium | 53% spore released - blackspot risk medium |
| Do not sow | Do not sow | Sow – do not sow dry |
Northam
Rainfall to date: 88.5mm. Days with significant stubble moisture: 20
| 8 May | 15 May | 22 May |
|---|---|---|
| 2% spore released - blackspot risk high | 6% spore released - blackspot risk high | 17% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Pingrup
Rainfall to date: 48.7mm. Days with significant stubble moisture: 30
| 8 May | 15 May | 22 May |
|---|---|---|
| 12% spore released - blackspot risk high | 23% spore released - blackspot risk high | 38% spore released - blackspot risk medium |
| Do not sow | Do not sow | Do not sow |
Salmon Gums
Rainfall to date: 153.6mm. Days with significant stubble moisture: 45
| 8 May | 15 May | 22 May |
|---|---|---|
| 43% spore released - blackspot risk medium | 55% spore released - blackspot risk medium | 70% spore released - blackspot risk low |
| Do not sow – not suited agronomically | Sow – do not sow dry | Sow – do not sow dry |
Scaddan
Rainfall to date: 191.8mm. Days with significant stubble moisture: 41
| 8 May | 15 May | 22 May |
|---|---|---|
| 34% spore released - blackspot risk medium | 46% spore released - blackspot risk medium | 62% spore released - blackspot risk low |
| Do not sow | Sow – do not sow dry | Sow – do not sow dry |