Field pea blackspot sowing guide for Western Australia – 3 May 2018

Page last updated: Monday, 7 May 2018 - 2:12pm

Please note: This content may be out of date and is currently under review.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 spore 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 2 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

Table 1 Percentage yield loss (in years) for different levels of blackspot risk scenarios
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: 98.3mm. Days with significant stubble moisture: 30

2 May	9 May	16 May
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

Dowerin

Rainfall to date: 51.6mm. Days with significant stubble moisture: 24

2 May	9 May	16 May
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

Katanning

Rainfall to date: 81mm. Days with significant stubble moisture: 29

1 May	8 May	15 May
10% 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

Kojonup

Rainfall to date: 77.6mm. Days with significant stubble moisture: 37

2 May	9 May	16 May
25% spore released - blackspot risk high	41% spore released - blackspot risk medium	57% spore released - blackspot risk medium
Do not sow	Do not sow	Sow – do not sow dry

Kondinin

Rainfall to date: 89.4mm. Days with significant stubble moisture: 33

2 May	9 May	16 May
17% spore released - blackspot risk high	31% spore released - blackspot risk medium	48% spore released - blackspot risk medium
Do not sow	Do not sow	Sow – do not sow dry

Lake King

Rainfall to date: 66.8mm. Days with significant stubble moisture: 44

2 May	9 May	16 May
41% spore released - blackspot risk medium	57% spore released - blackspot risk medium	72% spore released - blackspot risk low
Do not sow	Sow – do not sow dry	Sow – do not sow dry

Merredin

Rainfall to date: 60.9mm. Days with significant stubble moisture: 23

2 May	9 May	16 May
3% spore released - blackspot risk high	12% spore released - blackspot risk high	25% spore released - blackspot risk high
Do not sow	Do not sow	Do not sow

Mingenew

Rainfall to date: 81.7mm. Days with significant stubble moisture: 17

2 May	9 May	16 May
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

Moora

Rainfall to date: 68.3mm. Days with significant stubble moisture: 15

2 May	9 May	16 May
0% 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

Mt Barker

Rainfall to date: 70.1mm. Days with significant stubble moisture: 45

2 May	9 May	16 May
43% spore released - blackspot risk medium	59% spore released - blackspot risk medium	74% spore released - blackspot risk low
Do not sow	Do not sow	Do not sow – not suited agronomically

Mullewa

Rainfall to date: 88.3mm. Days with significant stubble moisture: 21

2 May	9 May	16 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

Newdegate

Rainfall to date: 50mm. Days with significant stubble moisture: 36

2 May	9 May	16 May
23% 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

Northam

Rainfall to date: 86.9mm. Days with significant stubble moisture: 20

2 May	9 May	16 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

Pingrup

Rainfall to date: 49.6mm. Days with significant stubble moisture: 30

2 May	9 May	16 May
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

Salmon Gums

Rainfall to date: 153.6mm. Days with significant stubble moisture: 45

1 May	8 May	15 May
43% spore released - blackspot risk medium	57% spore released - blackspot risk medium	72% spore released - blackspot risk low
Do not sow	Do not sow – not suited agronomically	Sow – do not sow dry

Scaddan

Rainfall to date: 190.8mm. Days with significant stubble moisture: 41

1 May	8 May	15 May
34% spore released - blackspot risk medium	48% spore released - blackspot risk medium	64% spore released - blackspot risk low
Do not sow	Do not sow	Sow – do not sow dry

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Ian Pritchard

+61 (0)8 9368 3515

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