Field Pea Blackspot Management Guide for Western Australia – 26 May 2020

Page last updated: Thursday, 28 May 2020 - 2:51pm

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 2020 to 25 May 2020 from the nearest weather station.

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.

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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: 111.7 mm.  Days with significant stubble moisture: 46

25 May

1 June

8 June

46% spore released - blackspot risk medium

62% spore released - blackspot risk low

75% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Boyup Brook

Rainfall to date: 119.4 mm.  Days with significant stubble moisture: 41

25 May

1 June

8 June

34% spore released - blackspot risk medium

50% spore released - blackspot risk medium

66% spore released - blackspot risk low

Do not sow

Sow - do not sow dry

Sow - do not sow dry

Cunderdin

Rainfall to date: 117.2 mm.  Days with significant stubble moisture: 23

25 May

1 June

8 June

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

Dalwallinu

Rainfall to date: 124 mm.  Days with significant stubble moisture: 31

25 May

1 June

8 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

Sow - do not sow dry

Dowerin

Rainfall to date: 152.4 mm.  Days with significant stubble moisture: 33

25 May

1 June

8 June

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

Gairdner

Rainfall to date: 86.5 mm.  Days with significant stubble moisture: 53

25 May

1 June

8 June

62% spore released - blackspot risk low

75% spore released - blackspot risk low

86% 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: 100 mm.  Days with significant stubble moisture: 60

25 May

1 June

8 June

75% spore released - blackspot risk low

86% spore released - blackspot risk low

93% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Hillman

Rainfall to date: 105 mm.  Days with significant stubble moisture: 39

25 May

1 June

8 June

29% spore released - blackspot risk high

46% spore released - blackspot risk medium

62% spore released - blackspot risk low

Do not sow

Sow – do not sow dry

Sow – do not sow dry

Jacup

Rainfall to date: 135.3 mm.  Days with significant stubble moisture: 54

25 May

1 June

8 June

64% spore released - blackspot risk low

77% spore released - blackspot risk low

87% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Katanning

Rainfall to date: 96.2 mm.  Days with significant stubble moisture: 32

25 May

1 June

8 June

15% spore released - blackspot risk high

29% spore released - blackspot risk high

46% spore released - blackspot risk medium

Do not sow

Do not sow

Sow - do not sow dry

Kojonup

Rainfall to date: 102.2 mm.  Days with significant stubble moisture: 40

25 May

1 June

8 June

31% spore released - blackspot risk medium

48% spore released - blackspot risk medium

64% spore released - blackspot risk low

Do not sow

Sow – do not sow dry

Sow – do not sow dry

Kondinin

Rainfall to date: 98.7 mm.  Days with significant stubble moisture: 49

25 May

1 June

8 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

Kulin

Rainfall to date: 122.8 mm.  Days with significant stubble moisture: 48

25 May

1 June

8 June

50% spore released - blackspot risk medium

66% spore released - blackspot risk low

79% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Lake King

Rainfall to date: 101.7 mm.  Days with significant stubble moisture: 53

25 May

1 June

8 June

62% spore released - blackspot risk low

75% spore released - blackspot risk low

86% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Merredin

Rainfall to date: 111.3 mm.  Days with significant stubble moisture: 35

25 May

1 June

8 June

21% spore released - blackspot risk high

36% spore released - blackspot risk medium

53% spore released - blackspot risk medium

Do not sow

Sow – do not sow dry

Sow – do not sow dry

Mingenew

Rainfall to date: 124.3 mm.  Days with significant stubble moisture: 24

25 May

1 June

8 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

Moora North West

Rainfall to date: 108.9 mm.  Days with significant stubble moisture: 35

25 May

1 June

8 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 - do not sow dry

Mount Howick

Rainfall to date: 113 mm.  Days with significant stubble moisture: 52

25 May

1 June

8 June

59% 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

Mt Barker

Rainfall to date: 150.5 mm.  Days with significant stubble moisture: 85

25 May

1 June

8 June

98% spore released - blackspot risk low

100% spore released - blackspot risk low

100% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Mullewa

Rainfall to date: 111 mm.  Days with significant stubble moisture: 35

25 May

1 June

8 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 – do not sow dry

Narrogin

Rainfall to date: 105.5 mm.  Days with significant stubble moisture: 42

25 May

1 June

8 June

36% spore released - blackspot risk medium

53% spore released - blackspot risk medium

68% spore released - blackspot risk low

Do not sow

Sow – do not sow dry

Sow – do not sow dry

Newdegate

Rainfall to date: 84.6 mm.  Days with significant stubble moisture: 44

25 May

1 June

8 June

41% spore released - blackspot risk medium

57% spore released - blackspot risk medium

72% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Northam

Rainfall to date: 84.3 mm.  Days with significant stubble moisture: 36

25 May

1 June

8 June

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

Pingrup

Rainfall to date: 88.3 mm.  Days with significant stubble moisture: 47

25 May

1 June

8 June

48% spore released - blackspot risk medium

64% spore released - blackspot risk low

77% spore released - blackspot risk low

Sow - do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Salmon Gums

Rainfall to date: 106 mm.  Days with significant stubble moisture: 60

25 May

1 June

8 June

75% spore released - blackspot risk low

80% spore released - blackspot risk low

89% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Scaddan

Rainfall to date: 110.2 mm.  Days with significant stubble moisture: 59

25 May

1 June

8 June

74% spore released - blackspot risk low

85% spore released - blackspot risk low

92% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Tammin

Rainfall to date: 97.6 mm.  Days with significant stubble moisture: 28

25 May

1 June

8 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

Toodyay

Rainfall to date: 85.8 mm.  Days with significant stubble moisture: 40

25 May

1 June

8 June

31% spore released - blackspot risk medium

48% spore released - blackspot risk medium

64% spore released - blackspot risk low

Do not sow

Sow - do not sow dry

Sow – do not sow dry

Contact information

Jean Galloway
+61 (0)8 9690 2172