Field pea blackspot sowing guide for Western Australia - 20 May 2019

Page last updated: Tuesday, 21 May 2019 - 12:26pm

Please note: This content may be out of date and is currently under review.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

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

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

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