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 1st January 2019 to 19th May 2019 from the nearest weather station.
Key to blackspot severity scores
| Blackspot risk | 5 out of 10 years | 3 out of 10 years | 1 out of 10 years |
|---|---|---|---|
| Low | 2 | 5 | 15 |
| Medium | 20 | 25 | 35 |
| High | 25 | 30 | 50 |
Bencubbin
Rainfall to date: 24.2 mm Days with significant stubble moisture: 7
| 19 May | 26 May | 2 June |
|---|---|---|
| 0% spore released - blackspot risk high | 0% spore released - blackspot risk high | 0% spore released blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Boyup Brook
Rainfall to date: 109.1 mm Days with significant stubble moisture: 42
| 19 May | 26 May | 2 June |
|---|---|---|
| 36% spore released - blackspot risk medium | 50% spore released - blackspot risk medium | 66% spore released - blackspot risk low |
| Do not sow | Sow - only if 3.5mm rain between 19-26 May | Sow - only if two rain events between 19 May - 2 June |
Cunderdin
Rainfall to date: 31 mm Days with significant stubble moisture: 14
| 19 May | 26 May | 2 June |
|---|---|---|
| 0% spore released - blackspot risk high | 2% spore released - blackspot risk high | 9% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Dalwallinu
Rainfall to date: 16.2 mm Days with significant stubble moisture: 9
| 19 May | 26 May | 2 June |
|---|---|---|
| 0% spore released - blackspot risk high | 0% spore released - blackspot risk high | 0% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Dowerin
Rainfall to date: 29.9 mm Days with significant stubble moisture: 10
| 19 May | 26 May | 2 June |
|---|---|---|
| 0% spore released - blackspot risk high | 0% spore released - blackspot risk high | 0% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Gairdner
Rainfall to date: 116.4 mm Days with significant stubble moisture: 49
| 19 May | 26 May | 2 June |
|---|---|---|
| 53% spore released - blackspot risk medium | 68% spore released - blackspot risk low | 80% spore released - blackspot risk low |
| Sow – do not sow dry | Sow - do not sow dry | Sow - do not sow dry |
Grass Patch
Rainfall to date: 46.9 mm Days with significant stubble moisture: 30
| 19 May | 26 May | 2 June |
|---|---|---|
| 12% spore released - blackspot risk high | 25% spore released - blackspot risk high | 41% spore released - blackspot risk medium |
| Do not sow | Do not sow | Do not sow |
Hillman
Rainfall to date: 46.7 mm Days with significant stubble moisture: 26
| 19 May | 26 May | 2 June |
|---|---|---|
| 6% spore released - blackspot risk high | 17% spore released - blackspot risk high | 31% spore released - blackspot risk medium |
| Do not sow | Do not sow | Do not sow |
Jacup
Rainfall to date: 109.8 mm Days with significant stubble moisture: 50
| 19 May | 26 May | 2 June |
|---|---|---|
| 55% spore released - blackspot risk medium | 70% spore released - blackspot risk low | 82% spore released - blackspot risk low |
| Sow- do not sow dry | Sow - do not sow dry | Sow - do not sow dry |
Katanning
Rainfall to date: 76.8 mm Days with significant stubble moisture: 39
| 19 May | 26 May | 2 June |
|---|---|---|
| 29% spore released - blackspot risk high | 46% spore released - blackspot risk medium | 62% spore released - blackspot risk low |
| Do not sow | Do not sow | Sow – only if two rain events between 19 May - 2 June |
Kojonup
Rainfall to date: 107.2 mm Days with significant stubble moisture: 37
| 19 May | 26 May | 2 June |
|---|---|---|
| 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 – only if two rain events between 19 May - 2 June |
Kondinin
Rainfall to date: 34.9 mm Days with significant stubble moisture: 17
| 19 May | 26 May | 2 June |
|---|---|---|
| 0% spore released - blackspot risk high | 4% spore released - blackspot risk high | 13% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Kulin
Rainfall to date: 38.3 mm Days with significant stubble moisture: 26
| 19 May | 26 May | 2 June |
|---|---|---|
| 6% spore released - blackspot risk high | 17% spore released - blackspot risk high | 31% spore released - blackspot risk medium |
| Do not sow | Do not sow | Do not sow |
Lake King
Rainfall to date: 57.3 mm Days with significant stubble moisture: 24
| 19 May | 26 May | 2 June |
|---|---|---|
| 4% spore released - blackspot risk high | 13% spore released - blackspot risk high | 27% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Merredin
Rainfall to date: 35.4 mm Days with significant stubble moisture: 19
| 19 May | 26 May | 2 June |
|---|---|---|
| 1% spore released - blackspot risk high | 3% spore released - blackspot risk high | 10% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Mingenew
Rainfall to date: 11.5 mm Days with significant stubble moisture: 3
| 19 May | 26 May | 2 June |
|---|---|---|
| 0% spore released - blackspot risk high | 0% spore released - blackspot risk high | 0% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Moora North West
Rainfall to date: 24.4 mm Days with significant stubble moisture: 14
| 19 May | 26 May | 2 June |
|---|---|---|
| 0% spore released - blackspot risk high | 0% spore released - blackspot risk high | 4% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Mount Howick
Rainfall to date: 83.2 mm Days with significant stubble moisture: 27
| 19 May | 26 May | 2 June |
|---|---|---|
| 7% 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 |
Mt Barker
Rainfall to date: 171.6 mm Days with significant stubble moisture: 65
| 19 May | 26 May | 2 June |
|---|---|---|
| 83% spore released - blackspot risk low | 91% spore released - blackspot risk low | 96% spore released - blackspot risk low |
| Do not sow – not suited agronomically | Sow – do not sow dry | Sow – do not sow dry |
Mullewa
Rainfall to date: 37.3 mm Days with significant stubble moisture: 14
| 19 May | 26 May | 2 June |
|---|---|---|
| 0% spore released - blackspot risk high | 0% spore released - blackspot risk high | 4% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Narrogin
Rainfall to date: 65.4 mm Days with significant stubble moisture: 42
| 19 May | 26 May | 2 June |
|---|---|---|
| 36% spore released - blackspot risk medium | 53% spore released - blackspot risk medium | 68% spore released - blackspot risk low |
| Do not sow | Sow – only if one rain event (3.5mm) between 19-26 May | Sow – only if two rain events between 19 May - 2 June |
Newdegate
Rainfall to date: 46.7 mm Days with significant stubble moisture: 29
| 19 May | 26 May | 2 June |
|---|---|---|
| 10% 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 |
Northam
Rainfall to date: 31 mm Days with significant stubble moisture: 27
| 19 May | 26 May | 2 June |
|---|---|---|
| 7% 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 |
Pingrup
Rainfall to date: 44.8 mm Days with significant stubble moisture: 31
| 19 May | 26 May | 2 June |
|---|---|---|
| 13% spore released - blackspot risk high | 27% spore released - blackspot risk high | 43% spore released - blackspot risk medium |
| Do not sow | Do not sow | Do not sow |
Salmon Gums
Rainfall to date: 51.6 mm Days with significant stubble moisture: 25
| 19 May | 26 May | 2 June |
|---|---|---|
| 5% spore released - blackspot risk high | 15% spore released - blackspot risk high | 29% spore released - blackspot risk high |
| Do not sow | Do not sow | Do not sow |
Scaddan
Rainfall to date: 65.4 mm Days with significant stubble moisture: 35
| 19 May | 26 May | 2 June |
|---|---|---|
| 21% spore released - blackspot risk high | 36% spore released - blackspot risk medium | 53% spore released - blackspot risk medium |
| Do not sow | Do not sow | Sow – only if two rain events between 19 May - 2 June |
Tammin
Rainfall to date: 45.2 mm Days with significant stubble moisture: 29
| 19 May | 26 May | 2 June |
|---|---|---|
| 10% 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 |
Toodyay
Rainfall to date: 39.8 mm Days with significant stubble moisture: 28
| 19 May | 26 May | 2 June |
|---|---|---|
| 9% spore released - blackspot risk high | 21% spore released - blackspot risk high | 36% spore released - blackspot risk medium |
| Do not sow | Do not sow | Do not sow |