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 2019 to 16 June 2019 from the nearest weather station.
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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: 53.7 mm Days with significant stubble moisture: 17
| 16 June | 23 June | 30 June |
|---|---|---|
| 0% spore released - blackspot risk high | 0% spore released - blackspot risk high | 0% spore released - blackspot risk high |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Boyup Brook
Rainfall to date: 158 mm Days with significant stubble moisture: 53
| 16 June | 23 June | 30 June |
|---|---|---|
| 62% spore released - blackspot risk low | 75% spore released - blackspot risk low | 86% spore released - blackspot risk low |
| Sow | Sow | Sow |
Cunderdin
Rainfall to date: 68.8 mm Days with significant stubble moisture: 28
| 16 June | 23 June | 30 June |
|---|---|---|
| 9% spore released - blackspot risk high | 15% spore released - blackspot risk high | 29% spore released - blackspot risk high |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Dalwallinu
Rainfall to date: 61.8 mm Days with significant stubble moisture: 23
| 16 June | 23 June | 30 June |
|---|---|---|
| 0% spore released - blackspot risk high | 0% spore released - blackspot risk high | 0% spore released - blackspot risk high |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Dowerin
Rainfall to date: 78.2 mm Days with significant stubble moisture: 24
| 16 June | 23 June | 30 June |
|---|---|---|
| 0% spore released - blackspot risk high | 0% spore released - blackspot risk high | 0% spore released - blackspot risk high |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Gairdner
Rainfall to date: 124.3 mm Days with significant stubble moisture: 60
| 16 June | 23 June | 30 June |
|---|---|---|
| 75% spore released - blackspot risk low | 82% spore released - blackspot risk low | 90% spore released - blackspot risk low |
| Sow | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Grass Patch
Rainfall to date: 60.3 mm Days with significant stubble moisture: 43
| 16 June | 23 June | 30 June |
|---|---|---|
| 38% spore released - blackspot risk medium | 48% spore released - blackspot risk medium | 64% spore released - blackspot risk low |
| Sow | Sow | Sow |
Hillman
Rainfall to date: 102.4 mm Days with significant stubble moisture: 40
| 16 June | 23 June | 30 June |
|---|---|---|
| 31% spore released - blackspot risk medium | 41% spore released - blackspot risk medium | 57% spore released - blackspot risk medium |
| Sow | Sow | Sow |
Jacup
Rainfall to date: 128 mm Days with significant stubble moisture: 65
| 16 June | 23 June | 30 June |
|---|---|---|
| 83% spore released - blackspot risk low | 88% spore released - blackspot risk low | 94% spore released - blackspot risk low |
| Sow | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Katanning
Rainfall to date: 120.4 mm Days with significant stubble moisture: 53
| 16 June | 23 June | 30 June |
|---|---|---|
| 62% spore released - blackspot risk low | 70% spore released - blackspot risk low | 82% spore released - blackspot risk low |
| Sow | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Kojonup
Rainfall to date: 157.6 mm Days with significant stubble moisture: 50
| 16 June | 23 June | 30 June |
|---|---|---|
| 55% spore released - blackspot risk medium | 70% spore released - blackspot risk low | 82% spore released - blackspot risk low |
| Sow | Sow | Sow |
Kondinin
Rainfall to date: 61.9 mm Days with significant stubble moisture: 31
| 16 June | 23 June | 30 June |
|---|---|---|
| 13% spore released - blackspot risk high | 21% spore released - blackspot risk high | 36% spore released - blackspot risk medium |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Kulin
Rainfall to date: 62.2 mm Days with significant stubble moisture: 40
| 16 June | 23 June | 30 June |
|---|---|---|
| 31% spore released - blackspot risk medium | 41% spore released - blackspot risk medium | 57% spore released - blackspot risk medium |
| Sow | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Lake King
Rainfall to date: 70.9 mm Days with significant stubble moisture: 37
| 16 June | 23 June | 30 June |
|---|---|---|
| 25% spore released - blackspot risk high | 34% spore released - blackspot risk medium | 50% spore released - blackspot risk medium |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Merredin
Rainfall to date: 72.2 mm Days with significant stubble moisture: 29
| 16 June | 23 June | 30 June |
|---|---|---|
| 10% spore released - blackspot risk high | 17% spore released - blackspot risk high | 31% spore released - blackspot risk medium |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Mingenew
Rainfall to date: 80.6 mm Days with significant stubble moisture: 14
| 16 June | 23 June | 30 June |
|---|---|---|
| 0% spore released - blackspot risk high | 1% spore released - blackspot risk high | 6% spore released - blackspot risk high |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Moora North West
Rainfall to date: 94.8 mm Days with significant stubble moisture: 28
| 16 June | 23 June | 30 June |
|---|---|---|
| 9% spore released - blackspot risk high | 17% spore released - blackspot risk high | 31% spore released - blackspot risk medium |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Mount Howick
Rainfall to date: 102.8 mm Days with significant stubble moisture: 41
| 16 June | 23 June | 30 June |
|---|---|---|
| 34% spore released - blackspot risk medium | 50% spore released - blackspot risk medium | 66% spore released - blackspot risk low |
| Sow | Sow | Sow |
Mt Barker
Rainfall to date: 201.1 mm Days with significant stubble moisture: 80
| 16 June | 23 June | 30 June |
|---|---|---|
| 97% spore released - blackspot risk low | 99% spore released - blackspot risk low | 100% spore released - blackspot risk low |
| Sow | Sow | Sow |
Mullewa
Rainfall to date: 83.3 mm Days with significant stubble moisture: 24
| 16 June | 23 June | 30 June |
|---|---|---|
| 4% spore released - blackspot risk high | 9% spore released - blackspot risk high | 21% spore released - blackspot risk high |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Narrogin
Rainfall to date: 122.6 mm Days with significant stubble moisture: 56
| 16 June | 23 June | 30 June |
|---|---|---|
| 68% spore released - blackspot risk low | 77% spore released - blackspot risk low | 87% spore released - blackspot risk low |
| Sow | Sow | Sow |
Newdegate
Rainfall to date: 61.9 mm Days with significant stubble moisture: 43
| 16 June | 23 June | 30 June |
|---|---|---|
| 38% spore released - blackspot risk medium | 48% spore released - blackspot risk medium | 64% spore released - blackspot risk low |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Northam
Rainfall to date: 86 mm Days with significant stubble moisture: 41
| 16 June | 23 June | 30 June |
|---|---|---|
| 34% spore released - blackspot risk medium | 43% spore released - blackspot risk medium | 59% spore released - blackspot risk medium |
| Sow | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Pingrup
Rainfall to date: 63.6 mm Days with significant stubble moisture: 45
| 16 June | 23 June | 30 June |
|---|---|---|
| 43% spore released - blackspot risk medium | 53% spore released - blackspot risk medium | 68% spore released - blackspot risk low |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Salmon Gums
Rainfall to date: 68.2 mm Days with significant stubble moisture: 37
| 16 June | 23 June | 30 June |
|---|---|---|
| 25% spore released - blackspot risk high | 34% spore released - blackspot risk medium | 50% spore released - blackspot risk medium |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Scaddan
Rainfall to date: 84.2 mm Days with significant stubble moisture: 48
| 16 June | 23 June | 30 June |
|---|---|---|
| 50% spore released - blackspot risk medium | 59% spore released - blackspot risk medium | 74% spore released - blackspot risk low |
| Sow | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Tammin
Rainfall to date: 83.2 mm Days with significant stubble moisture: 43
| 16 June | 23 June | 30 June |
|---|---|---|
| 38% spore released - blackspot risk medium | 48% spore released - blackspot risk medium | 64% spore released - blackspot risk low |
| Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |
Toodyay
Rainfall to date: 105.9 mm Days with significant stubble moisture: 45
| 16 June | 23 June | 30 June |
|---|---|---|
| 43% spore released - blackspot risk medium | 55% spore released - blackspot risk medium | 70% spore released - blackspot risk low |
| Sow | Do not sow – high yield loss for late sowing | Do not sow – high yield loss for late sowing |