Field pea blackspot sowing guide for Western Australia – 6 June 2017

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 DAFWA's Blackspot Manager model using weather data from January to 5 June 2017 from the nearest weather station.

Boyup Brook

5 June

12 June

19 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

Dowerin 

5 June

12 June

19 June

48% 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

Don’t sow – High yield loss for late sowing

Katanning 

5 June

12 June

19 June

57% 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

Kojonup

5 June

12 June

19 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 – do not sow dry

Kondinin

5 June

12 June

19 June

72% spore released – blackspot risk low

82% spore released – blackspot risk low

90% spore released – blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Don’t sow – High yield loss for late sowing

Lake King

5 June

12 June

19 June

66% 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

Don’t sow – High yield loss for late sowing

Merredin 

5 June

12 June

19 June

75% 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

Don’t sow – High yield loss for late sowing

Mingenew 

5 June

12 June

19 June

36% 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

Don’t sow – High yield loss for late sowing

Moora 

5 June

12 June

19 June

41% spore released – blackspot risk medium

55% spore released – blackspot risk medium

70% spore released – blackspot risk low

Do not sow

Sow – do not sow dry

Don’t sow – High yield loss for late sowing

Mount Barker 

5 June

12 June

19 June

92% spore released – blackspot risk low

97% spore released – blackspot risk low

99% spore released – blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Sow – do not sow dry

Mullewa 

5 June

12 June

19 June

50% spore released – blackspot risk is medium

64% spore released – blackspot risk is low

77% spore released – blackspot risk is low

Sow – do not sow dry

Sow – do not sow dry

Don’t sow – High yield loss for late sowing

Newdegate 

5 June

12 June

19 June

38% spore released – blackspot risk is medium

53% spore released – blackspot risk is medium

68% spore released – blackspot risk is low

Do not sow

Sow – do not sow dry

Don’t sow – High yield loss for late sowing

Northam 

5 June

12 June

19 June

41% spore released – blackspot risk is medium

55% spore released – blackspot risk is medium

70% spore released – blackspot risk is low

Do not sow

Sow – do not sow dry

Sow – do not sow dry

Pingrup

5 June

12 June

19 June

53% 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

Salmon Gums 

5 June

12 June

19 June

99% spore released – blackspot risk is low

100% spore released – blackspot risk is low

100% spore released – blackspot risk is low

Sow – do not sow dry

Sow – do not sow dry

Don’t sow – High yield loss for late sowing

Scaddan 

5 June

12 June

19 June

74% spore released – blackspot risk low

83% spore released – blackspot risk low

91% spore released – blackspot risk low

Sow – do not sow dry

Sow – do not sow dry

Don’t sow – High yield loss for late sowing

Key to blackspot severity scores

Table 1 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

Contact information

Mark Seymour
+61 (0)8 9083 1143
Jean Galloway
+61 (0)8 9690 2172
Page last updated: Friday, 9 June 2017 - 3:20pm

Author

Kawsar Salam

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