Field pea blackspot management guide for South Australia - 3 May 2018

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 2018 to 2 May 2018 from the nearest weather station.

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

Balaklava

Rainfall to date: 28.7mm. Days with significant stubble moisture: 21

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Do not sow as risk is high
Blackspot risk High High High

Blyth (Hart)

Rainfall to date: 30.5mm. Days with significant stubble moisture: 29

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 3-4
Sowing guide (based on agronomic suitability) Marginal early Marginal early Do not sow as risk is medium
Blackspot risk High High Medium

Bordertown

Rainfall to date: 29.6mm. Days with significant stubble moisture: 27

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 3-4
Sowing guide (based on agronomic suitability) Too early Too early Marginal early
Blackspot risk High High Medium

Bute

Rainfall to date: 40.1mm. Days with significant stubble moisture: 33

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 3-4 3-4
Sowing guide (based on agronomic suitability) Do not sow as risk is high Do not sow as risk is medium Do not sow as risk is medium
Blackspot risk High Medium Medium

Clare

Rainfall to date: 56.2mm. Days with significant stubble moisture: 42

Weekly forecast 2 May 9 May 16 May
Blackspot severity 3-4 3-4 2
Sowing guide (based on agronomic suitability) Too early Too early Too early
Blackspot risk Medium Medium Low

Crystal Brook

Rainfall to date: 27.2mm. Days with significant stubble moisture: 15

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Do not sow as risk is high Do not sow as risk is high Do not sow as risk is high
Blackspot risk High High High

Eudunda

Rainfall to date: 54.4mm. Days with significant stubble moisture: 34

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 3-4 3-4
Sowing guide (based on agronomic suitability) Marginal early Marginal early Do not sow as risk is medium
Blackspot risk High Medium Medium

Keith

Rainfall to date: 31.4mm. Days with significant stubble moisture: 19

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High High

Kimba

Rainfall to date: 24mm. Days with significant stubble moisture: 8

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High High

Kingsford

Rainfall to date: 49.8mm. Days with significant stubble moisture: 43

Weekly forecast 2 May 9 May 16 May
Blackspot severity 3-4 3-4 2
Sowing guide (based on agronomic suitability) Marginal early Marginal early OK to sow
Blackspot risk Medium Medium Low

Kyancutta

Rainfall to date: 30.7mm. Days with significant stubble moisture: 19

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High High

Lameroo

Rainfall to date: 14.1mm. Days with significant stubble moisture: 7

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High High

Lock

Rainfall to date: 35mm. Days with significant stubble moisture: 21

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High High

Maitland

Rainfall to date: 45.6mm. Days with significant stubble moisture: 33

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 3-4 3-4
Sowing guide (based on agronomic suitability) Too early Too early Marginal early
Blackspot risk High Medium Medium

Mannum

Rainfall to date: 22.5mm. Days with significant stubble moisture: 13

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High High

Minlaton

Rainfall to date: 26.1mm. Days with significant stubble moisture: 21

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Too early Marginal early Do not sow as risk is high
Blackspot risk High High High

Minnipa

Rainfall to date: 25.4mm. Days with significant stubble moisture: 17

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Do not sow as risk is high Do not sow as risk is high Do not sow as risk is high
Blackspot risk High High High

Mount Barker SA

Rainfall to date: 94.9mm. Days with significant stubble moisture: 55

Weekly forecast 2 May 9 May 16 May
Blackspot severity 2 2 1
Sowing guide (based on agronomic suitability) Too early Too early Too early
Blackspot risk Low Low Low

Murray Bridge

Rainfall to date: 26.2mm. Days with significant stubble moisture: 15

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High High

Mypolonga

Rainfall to date: 22mm. Days with significant stubble moisture: 9

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High High

Naracoorte

Rainfall to date: 50.9mm. Days with significant stubble moisture: 49

Weekly forecast 2 May 9 May 16 May
Blackspot severity 3-4 2 1
Sowing guide (based on agronomic suitability) Too early Too early Too early
Blackspot risk Medium Low Low

Nuriootpa

Rainfall to date: 52mm. Days with significant stubble moisture: 32

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 3-4
Sowing guide (based on agronomic suitability) Marginal early Marginal early Do not sow as risk is medium
Blackspot risk High High Medium

Palmer

Rainfall to date: 37.2mm. Days with significant stubble moisture: 29

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 3-4
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High Medium

Port Broughton

Rainfall to date: 33.3mm. Days with significant stubble moisture: 29

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 3-4
Sowing guide (based on agronomic suitability) Do not sow as risk is high Do not sow as risk is high Do not sow as risk is medium
Blackspot risk High High Medium

Riverton

Rainfall to date: 54.2mm. Days with significant stubble moisture: 35

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 3-4 3-4
Sowing guide (based on agronomic suitability) Too early Too early Marginal early
Blackspot risk High Medium Medium

Sedan

Rainfall to date: 22.1mm. Days with significant stubble moisture: 13

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Marginal early
Blackspot risk High High High

Snowtown

Rainfall to date: 49.7mm. Days with significant stubble moisture: 37

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 3-4 3-4
Sowing guide (based on agronomic suitability) Marginal early Marginal early Do not sow as risk is medium
Blackspot risk High Medium Medium

Strathalbyn

Rainfall to date: 42.4mm. Days with significant stubble moisture: 32

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 3-4
Sowing guide (based on agronomic suitability) Marginal early Marginal early Do not sow as risk is medium
Blackspot risk High High Medium

Tumby Bay

Rainfall to date: 21.8mm. Days with significant stubble moisture: 15

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Do not sow as risk is high
Blackspot risk High High High

Yeelanna

Rainfall to date: 32.6mm. Days with significant stubble moisture: 22

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Marginal early Marginal early Do not sow as risk is high
Blackspot risk High High High

Yorketown

Rainfall to date: 29.8mm. Days with significant stubble moisture: 20

Weekly forecast 2 May 9 May 16 May
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Too early Marginal early Do not sow as risk is high
Blackspot risk High High High

More information

For more information contact Dr Jenny Davidson at SARDI on ph +61 (0)8 8303 9389.

SARDI
SARDI

Contact information

Jean Galloway
+61 (0)8 9690 2172
Page last updated: Monday, 7 May 2018 - 12:23pm