Field pea blackspot management guide for Western Australia - 11 May 2020

Page last updated: Friday, 15 May 2020 - 8:55am

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 1 January 2020 to 11 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: 99.5 mm.  Days with significant stubble moisture: 44

11 May

18 May

25 May

41% spore released - blackspot risk medium

50% spore released - blackspot risk medium

66% spore released - blackspot risk low

Do not sow

Do not sow

Do not sow

Boyup Brook

Rainfall to date: 96.3 mm.  Days with significant stubble moisture: 36

11 May

18 May

25 May

23% spore released - blackspot risk high

36% spore released - blackspot risk medium

53% spore released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Cunderdin

Rainfall to date: 105 mm.  Days with significant stubble moisture: 22

11 May

18 May

25 May

3% spore released - blackspot risk high

5% spore released - blackspot risk high

15% spore released - blackspot risk high

Do not sow

Do not sow

Do not sow

Dalwallinu

Rainfall to date: 107 mm.  Days with significant stubble moisture: 29

11 May

18 May

25 May

10% 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

Dowerin

Rainfall to date: 136.7 mm.  Days with significant stubble moisture: 30

11 May

18 May

25 May

12% 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

Gairdner

Rainfall to date: 74.5 mm.  Days with significant stubble moisture: 45

11 May

18 May

25 May

43% spore released - blackspot risk medium

53% spore released - blackspot risk medium

68% spore released - blackspot risk low

Do not sow – not suited agronomically

Do not sow

Sow – do not sow dry

Grass Patch

Rainfall to date: 93.4 mm.  Days with significant stubble moisture: 58

11 May

18 May

25 May

72% spore released - blackspot risk low

79% spore released - blackspot risk low

88% spore released - blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Hillman

Rainfall to date: 91.3 mm.  Days with significant stubble moisture: 38

11 May

18 May

25 May

27% spore released - blackspot risk high

36% spore released - blackspot risk medium

53% spore released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Jacup

Rainfall to date: 125.5 mm.  Days with significant stubble moisture: 50

11 May

18 May

25 May

55% 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

Katanning

Rainfall to date: 85 mm.  Days with significant stubble moisture: 30

11 May

18 May

25 May

12% 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

Kojonup

Rainfall to date: 88.8 mm.  Days with significant stubble moisture: 37

11 May

18 May

25 May

25% spore released - blackspot risk high

36% spore released - blackspot risk medium

53% spore released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Kondinin

Rainfall to date: 88 mm.  Days with significant stubble moisture: 49

11 May

18 May

25 May

53% spore released - blackspot risk medium

62% spore released - blackspot risk low

75% spore released - blackspot risk low

Do not sow

Do not sow

Sow – do not sow dry

Kulin

Rainfall to date: 110.7 mm.  Days with significant stubble moisture: 46

11 May

18 May

25 May

46% spore released - blackspot risk medium

55% spore released - blackspot risk medium

70% spore released - blackspot risk low

Do not sow

Do not sow

Sow – do not sow dry

Lake King

Rainfall to date: 93.2 mm.  Days with significant stubble moisture: 52

11 May

18 May

25 May

59% 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

Merredin

Rainfall to date: 95.7 mm.  Days with significant stubble moisture: 33

11 May

18 May

25 May

17% 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

Mingenew

Rainfall to date: 106.9 mm.  Days with significant stubble moisture: 22

11 May

18 May

25 May

3% spore released - blackspot risk high

6% spore released - blackspot risk high

17% spore released - blackspot risk high

Do not sow

Do not sow

Do not sow

Moora North West

Rainfall to date: 98.5 mm.  Days with significant stubble moisture: 34

11 May

18 May

25 May

19% 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

Mount Howick

Rainfall to date: 106.2 mm.  Days with significant stubble moisture: 44

11 May

18 May

25 May

41% spore released - blackspot risk medium

55% spore released - blackspot risk medium

70% spore released - blackspot risk low

Do not sow

Do not sow

Sow – do not sow dry

Mt Barker WA

Rainfall to date: 135.5 mm.  Days with significant stubble moisture: 80

11 May

18 May

25 May

97% spore released - blackspot risk low

99% spore released - blackspot risk low

100% spore released - blackspot risk low

Do not sow – not suited agronomically

Do not sow – not suited agronomically

Sow – do not sow dry

Mullewa

Rainfall to date: 98.6 mm.  Days with significant stubble moisture: 33

11 May

18 May

25 May

17% 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

Narrogin

Rainfall to date: 93.5 mm.  Days with significant stubble moisture: 40

11 May

18 May

25 May

31% spore released - blackspot risk medium

41% spore released - blackspot risk medium

57% spore released - blackspot risk medium

Do not sow

Do not sow

Do not sow

Newdegate

Rainfall to date: 73.4 mm.  Days with significant stubble moisture: 42

11 May

18 May

25 May

36% spore released - blackspot risk medium

46% spore released - blackspot risk medium

62% spore released - blackspot risk low

Do not sow

Do not sow

Do not sow

Northam

Rainfall to date: 70 mm.  Days with significant stubble moisture: 34

11 May

18 May

25 May

19% 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

Pingrup

Rainfall to date: 80.3 mm.  Days with significant stubble moisture: 46

11 May

18 May

25 May

46% spore released - blackspot risk medium

53% spore released - blackspot risk medium

68% spore released - blackspot risk low

Do not sow

Do not sow

Sow – do not sow dry

Salmon Gums

Rainfall to date: 101.6 mm.  Days with significant stubble moisture: 60

11 May

18 May

25 May

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: 102 mm.  Days with significant stubble moisture: 56

11 May

18 May

25 May

68% 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

Tammin

Rainfall to date: 77 mm.  Days with significant stubble moisture: 27

11 May

18 May

25 May

7% 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

Toodyay

Rainfall to date: 69.3 mm.  Days with significant stubble moisture: 38

11 May

18 May

25 May

27% spore released - blackspot risk high

36% spore released - blackspot risk medium

53% spore released - blackspot risk medium

Do not sow

Do not sow

Do not sow

 

Contact information

Jean Galloway
+61 (0)8 9690 2172