Field pea blackspot management guide for Western Australia - 10 May 2021

Page last updated: Tuesday, 11 May 2021 - 8:03am

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.

This prediction is based on DPIRD's Blackspot Manager model using weather data from 1 January 2021 to 9 May 2021 from the nearest weather station.

You may notice weather station changes for one location, this is to ensure that the weather data being used is the most accurate available for the area, and can be influenced by BOM locations. The location that has changed is Lake King which now is Lake Camm.

Sowing time can depend on a range of factors and it is recommended to consult an agronomist to determine the optimal sowing window for your situation.

Missing a location or would like to receive email or sms alerts?

Sign up today to get alerts and add your local weather station. Text 'blackspot', your name and nearest weather station to 0475 959 932 or email BlackspotManager@dpird.wa.gov.au.

Key to blackspot severity scores

The aim is to delay sowing of field pea crops, where agronomically possible, until the majority of blackspot spores (approximately 60%) have been released prior to the crop emergence. This strategy reduces yield losses from blackspot.

Blackspot risk

Spores released (%)

Yield loss for different levels of blackspot risk scenarios (%)

Low

60 – 100

2 - 15

Medium

30 - 59

20 - 35

High

0 - 29

25 - 50

Bencubbin

Rainfall to date: 167.4 mm      Days with significant stubble moisture: 22

9 May

16 May

23 May

3% spores released - blackspot risk high

10% spores released - blackspot risk high

23% spores released - blackspot risk high

Do not sow

Do not sow

Do not sow

Boyup Brook

Rainfall to date: 216.1 mm      Days with significant stubble moisture: 35

9 May

16 May

23 May

21% spores released - blackspot risk high

36% spores released - blackspot risk medium

53% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Cunderdin

Rainfall to date: 156.7 mm      Days with significant stubble moisture: 39

9 May

16 May

23 May

29% spores released - blackspot risk high

46% spores released - blackspot risk medium

62% spores released - blackspot risk low

Do not sow

Do not sow

Sow - do not sow dry

Dalwallinu

Rainfall to date: 227.8 mm      Days with significant stubble moisture: 33

9 May

16 May

23 May

17% spores released - blackspot risk high

31% spores released - blackspot risk medium

48% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Darkan

Rainfall to date: 220.2 mm      Days with significant stubble moisture: 50

9 May

16 May

23 May

55% spores released - blackspot risk medium

70% spores released - blackspot risk low

82% spores released - blackspot risk low

Do not sow

Sow - do not sow dry

Sow - do not sow dry

Dowerin

Rainfall to date: 133.2 mm      Days with significant stubble moisture: 30

9 May

16 May

23 May

12% spores released - blackspot risk high

25% spores released - blackspot risk high

41% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Gairdner

Rainfall to date: 214.5 mm      Days with significant stubble moisture: 46

9 May

16 May

23 May

46% spores released - blackspot risk medium

62% spores released - blackspot risk low

75% spores released - blackspot risk low

Do not sow

Too early to sow before the 18th May

Sow - do not sow dry

Grass Patch

Rainfall to date: 128.3 mm      Days with significant stubble moisture: 68

9 May

16 May

23 May

87% spores released - blackspot risk low

94% spores released - blackspot risk low

97% spores released - blackspot risk low

Too early to sow before the 10th May

Sow - do not sow dry

Sow - do not sow dry

Jacup

Rainfall to date: 211 mm       Days with significant stubble moisture: 56

9 May

16 May

23 May

68% spores released - blackspot risk low

80% spores released - blackspot risk low

89% spores released - blackspot risk low

Too early to sow before the 10th May

Sow - do not sow dry

Sow - do not sow dry

Katanning

Rainfall to date: 171.8 mm      Days with significant stubble moisture: 47

9 May

16 May

23 May

48% spores released - blackspot risk medium

64% spores released - blackspot risk low

77% spores released - blackspot risk low

Do not sow

Sow - do not sow dry

Sow - do not sow dry

Kojonup

Rainfall to date: 266 mm      Days with significant stubble moisture: 42

9 May

16 May

23 May

36% spores released - blackspot risk medium

53% spores released - blackspot risk medium

68% spores released - blackspot risk low

Do not sow

Do not sow

Sow - do not sow dry

Kondinin

Rainfall to date: 155.2 mm      Days with significant stubble moisture: 39

9 May

16 May

23 May

29% spores released - blackspot risk high

46% spores released - blackspot risk medium

62% spores released - blackspot risk low

Do not sow

Do not sow

Sow - do not sow dry

Kulin

Rainfall to date: 89.6 mm      Days with significant stubble moisture: 15

9 May

16 May

23 May

0% spores released - blackspot risk high

3% spores released - blackspot risk high

10% spores released - blackspot risk high

Do not sow

Do not sow

Do not sow

Lake Camm

Rainfall to date: 168 mm      Days with significant stubble moisture: 45

9 May

16 May

23 May

43% spores released - blackspot risk medium

59% spores released - blackspot risk medium

74% spores released - blackspot risk low

Do not sow

Do not sow

Sow - do not sow dry

Merredin

Rainfall to date: 146.2 mm      Days with significant stubble moisture: 34

9 May

16 May

23 May

19% spores released - blackspot risk high

34% spores released - blackspot risk medium

50% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Mingenew

Rainfall to date: 129.7 mm      Days with significant stubble moisture: 31

9 May

16 May

23 May

13% spores released - blackspot risk high

27% spores released - blackspot risk high

43% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Moora North West

Rainfall to date: 176 mm       Days with significant stubble moisture: 41

9 May

16 May

23 May

34% spores released - blackspot risk medium

50% spores released - blackspot risk medium

66% spores released - blackspot risk low

Do not sow

Do not sow

Sow - do not sow dry

Mount Howick

Rainfall to date: 106.4 mm      Days with significant stubble moisture: 56

9 May

16 May

23 May

68% spores released - blackspot risk low

80% spores released - blackspot risk low

89% spores released - blackspot risk low

Too early to sow before the 10th May

Sow - do not sow dry

Sow - do not sow dry

Mt Barker

Rainfall to date: 239.5 mm      Days with significant stubble moisture: 82

9 May

16 May

23 May

97% spores released - blackspot risk low

99% spores released - blackspot risk low

100% spores released - blackspot risk low

Too early to sow before the 25th May

Too early to sow before the 25th May

Too early to sow before the 25th May

Mullewa

Rainfall to date: 183 mm      Days with significant stubble moisture: 33

9 May

16 May

23 May

17% spores released - blackspot risk high

31% spores released - blackspot risk medium

48% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Narrogin

Rainfall to date: 163.4 mm      Days with significant stubble moisture: 36

9 May

16 May

23 May

23% spores released - blackspot risk high

38% spores released - blackspot risk medium

55% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Newdegate

Rainfall to date: 128.4 mm      Days with significant stubble moisture: 41

9 May

16 May

23 May

34% spores released - blackspot risk medium

50% spores released - blackspot risk medium

66% spores released - blackspot risk low

Do not sow

Do not sow

Sow - do not sow dry

Northam

Rainfall to date: 239.9 mm      Days with significant stubble moisture: 30

9 May

16 May

23 May

12% spores released - blackspot risk high

25% spores released - blackspot risk high

41% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Pingrup

Rainfall to date: 133.2 mm      Days with significant stubble moisture: 32

9 May

16 May

23 May

15% spores released - blackspot risk high

29% spores released - blackspot risk high

46% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Salmon Gums

Rainfall to date: 149.8 mm      Days with significant stubble moisture: 58

9 May

16 May

23 May

72% spores released - blackspot risk low

83% spores released - blackspot risk low

91% spores released - blackspot risk low

Too early to sow before the 10th May

Sow - do not sow dry

Sow - do not sow dry

Scaddan

Rainfall to date: 130.3 mm      Days with significant stubble moisture: 66

9 May

16 May

23 May

85% spores released - blackspot risk low

92% spores released - blackspot risk low

97% spores released - blackspot risk low

Too early to sow before the 10th May

Sow - do not sow dry

Sow - do not sow dry

Tammin

Rainfall to date: 137.4 mm      Days with significant stubble moisture: 31

9 May

16 May

23 May

13% spores released - blackspot risk high

27% spores released - blackspot risk high

43% spores released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Toodyay

Rainfall to date: 255.1 mm      Days with significant stubble moisture: 41

9 May

16 May

23 May

34% spores released - blackspot risk medium

50% spores released - blackspot risk medium

66% spores released - blackspot risk low

Do not sow

Do not sow

Sow - do not sow dry

 

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Contact information

Mark Seymour
+61 (0)8 9083 1143
Jean Galloway
+61 (0)8 9690 2172

Author

Janette Pratt

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