Field pea blackspot sowing guide for Western Australia – 4 June 2019

Page last updated: Friday, 7 June 2019 - 10:50am

Please note: This content may be out of date and is currently under review.

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 Department of Primary Industries and Regional Development's (DPIRD) Blackspot Manager model using weather data from 1 January 2019 to 2 June 2019 from the nearest weather station.

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Key to blackspot severity scores

Percentage yield loss (in years) for different levels of blackspot risk scenarios
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

2 June	9 June	16 June
0% spore released - blackspot risk high	0% spore released - blackspot risk high	0% spore released - blackspot risk high
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Boyup Brook

Rainfall to date: 106.6 mm Days with significant stubble moisture: 44

2 June	9 June	16 June
41% spore released - blackspot risk medium	48% spore released - blackspot risk medium	64% spore released - blackspot risk low
Sow - do not sow dry	Sow - do not sow dry	Sow

Cunderdin

Rainfall to date: 31.2 mm Days with significant stubble moisture: 18

2 June	9 June	16 June
1% spore released - blackspot risk high	2% spore released - blackspot risk high	9% spore released - blackspot risk high
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Dalwallinu

Rainfall to date: 16.2 mm Days with significant stubble moisture: 13

2 June	9 June	16 June
0% spore released - blackspot risk high	0% spore released - blackspot risk high	0% spore released - blackspot risk high
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Dowerin

Rainfall to date: 30.3 mm Days with significant stubble moisture: 14

2 June

9 June

16 June

0% spore released - blackspot risk high

Sow – Do not sow dry

Do not sow – high yield loss for late sowing

Gairdner

Rainfall to date: 117.8 mm Days with significant stubble moisture: 54

2 June	9 June	16 June
64% spore released - blackspot risk low	70% spore released - blackspot risk low	82% spore released - blackspot risk low
Sow	Sow	Sow

Grass Patch

Rainfall to date: 48.7 mm Days with significant stubble moisture: 35

2 June	9 June	16 June
10% spore released - blackspot risk high	15% spore released - blackspot risk high	29% spore released - blackspot risk high
Sow – Do not sow dry	Sow – Do not sow dry	Sow – Do not sow dry

Hillman

Rainfall to date: 47.6 mm Days with significant stubble moisture: 30

2 June	9 June	16 June
12% spore released - blackspot risk high	17% spore released - blackspot risk high	31% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Sow – Do not sow dry

Jacup

Rainfall to date: 110.4 mm Days with significant stubble moisture: 55

2 June	9 June	16 June
66% spore released - blackspot risk low	72% spore released - blackspot risk low	83% spore released - blackspot risk low
Sow	Sow	Sow

Katanning

Rainfall to date: 79 mm Days with significant stubble moisture: 43

2 June	9 June	16 June
38% spore released - blackspot risk medium	46% spore released - blackspot risk medium	62% spore released - blackspot risk low
Sow – Do not sow dry	Sow – Do not sow dry	Sow

Kojonup

Rainfall to date: 107.9 mm Days with significant stubble moisture: 40

2 June	9 June	16 June
31% spore released - blackspot risk medium	38% spore released - blackspot risk medium	55% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Sow

Kondinin

Rainfall to date: 34.6 mm Days with significant stubble moisture: 21

2 June	9 June	16 June
2% spore released - blackspot risk high	4% spore released - blackspot risk high	13% spore released - blackspot risk high
Sow – Do Not sow Dry	Sow – Do Not sow Dry	Do not sow – high yield loss for late sowing

Kulin

Rainfall to date: 37.3 mm Days with significant stubble moisture: 30

2 June	9 June	16 June
12% spore released - blackspot risk high	17% spore released - blackspot risk high	31% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Sow – Do not sow dry

Lake King

Rainfall to date: 59.3 mm Days with significant stubble moisture: 30

2 June	9 June	16 June
12% spore released - blackspot risk high	17% spore released - blackspot risk high	16 Jun 31% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

2 June

9 June

16 June

12% spore released - blackspot risk high

17% spore released - blackspot risk high

16 Jun

31% spore released - blackspot risk medium

Sow – Do not sow dry

Do not sow – high yield loss for late sowing

Merredin

Rainfall to date: 35.4 mm Days with significant stubble moisture: 19

2 June	9 June	16 June
1% spore released - blackspot risk high	3% spore released - blackspot risk high	10% spore released - blackspot risk high
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Mingenew

Rainfall to date: 11 mm Days with significant stubble moisture: 4

2 June	9 June	16 June
0% spore released - blackspot risk high	0% spore released - blackspot risk high	0% spore released - blackspot risk high
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Moora North West

Rainfall to date: 27.4 mm Days with significant stubble moisture: 18

2 June	9 June	16 June
1% spore released - blackspot risk high	2% spore released - blackspot risk high	9% spore released - blackspot risk high
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Mount Howick

Rainfall to date: 85.2 mm Days with significant stubble moisture: 33

2 June	9 June	16 June
17% spore released - blackspot risk high	23% spore released - blackspot risk high	38% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Sow – Do not sow dry

Mt Barker

Rainfall to date: 169.4 mm Days with significant stubble moisture: 70

2 June	9 June	16 June
89% spore released - blackspot risk low	92% spore released - blackspot risk low	97% spore released - blackspot risk low
Sow – do not sow dry	Sow	Sow

Mullewa

Rainfall to date: 37.3 mm Days with significant stubble moisture: 14

2 June	9 June	16 June
0% spore released - blackspot risk high	0% spore released - blackspot risk high	4% spore released - blackspot risk high
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Narrogin

Rainfall to date: 65.4 mm Days with significant stubble moisture: 46

2 June	9 June	16 June
46% spore released - blackspot risk medium	53% spore released - blackspot risk medium	68% spore released - blackspot risk low
Sow – Do not sow dry	Sow	Sow

Newdegate

Rainfall to date: 47.1 mm Days with significant stubble moisture: 33

2 June	9 June	16 June
17% spore released - blackspot risk high	23% spore released - blackspot risk high	38% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Northam

Rainfall to date: 32.1 mm Days with significant stubble moisture: 31

2 June	9 June	16 June
13% spore released - blackspot risk high	19% spore released - blackspot risk high	34% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Sow – Do not sow dry

Pingrup

Rainfall to date: 44.4 mm Days with significant stubble moisture: 35

2 June	9 June	16 June
21% spore released - blackspot risk high	27% spore released - blackspot risk high	43% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Sow – Do not sow dry

Salmon Gums

Rainfall to date: 52 mm Days with significant stubble moisture: 29

2 June	9 June	16 June
10% spore released - blackspot risk high	15% spore released - blackspot risk high	29% spore released - blackspot risk high
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Scaddan

Rainfall to date: 67.6 mm Days with significant stubble moisture: 40

2 June	9 June	16 June
31% spore released - blackspot risk medium	38% spore released - blackspot risk medium	55% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Sow

Tammin

Rainfall to date: 45.3 mm Days with significant stubble moisture: 33

2 June	9 June	16 June
17% spore released - blackspot risk high	23% spore released - blackspot risk high	38% spore released - blackspot risk medium
Sow – Do not sow dry	Sow – Do not sow dry	Do not sow – high yield loss for late sowing

Toodyay

Rainfall to date: 40.1 mm Days with significant stubble moisture: 32

2 June	9 June	16 June
15% spore released - blackspot risk high	21% spore released - blackspot risk high	36% spore released - blackspot risk medium
Sow – Do Not sow Dry	Sow – Do Not sow Dry	Sow – Do Not sow Dry

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