Field pea blackspot management guide for South Australia - 4 July 2018

Page last updated: Thursday, 5 July 2018 - 2:56pm

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.

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 July 2018 from the nearest weather station.

Key to blackspot severity scores

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

Last date used for prediction: 2 July 2018
Rainfall to date: 92.7mm
Days with significant stubble moisture: 51

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 2 1
Sowing guide (based on agronomic suitability)

Okay to sow but risk is medium

Okay to sow Okay to sow
Blackspot risk Medium Low Low

Blyth (Hart)

Last date used for prediction: 2 July 2018
Rainfall to date: 111mm
Days with significant stubble moisture: 74

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Bordertown

Last date used for prediction: 2 July 2018
Rainfall to date: 138mm
Days with significant stubble moisture: 65

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Bute

Last date used for prediction: 2 July 2018
Rainfall to date: 124.1mm
Days with significant stubble moisture: 74

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Clare

Last date used for prediction: 2 July 2018
Rainfall to date: 165.4mm
Days with significant stubble moisture: 89

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Crystal Brook

Last date used for prediction: 2 July 2018
Rainfall to date: 92.9mm
Days with significant stubble moisture: 47

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 2 2
Sowing guide (based on agronomic suitability) Okay to sow, but risk medium Okay to sow Okay to sow
Blackspot risk Medium Low Low

Eudunda

Last date used for prediction: 2 July 2018
Rainfall to date: 118.6mm
Days with significant stubble moisture: 72

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Farrell Flat

Last date used for prediction: 2 July 2018
Rainfall to date: 125.7mm
Days with significant stubble moisture: 71

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Keith

Last date used for prediction: 2 July 2018
Rainfall to date: 135.9mm
Days with significant stubble moisture: 57

Weekly forecast 2 July 9 July 16 July
Blackspot severity 2 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Kent Town

Last date used for prediction: 2 July 2018
Rainfall to date: 163.6mm
Days with significant stubble moisture: 65

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Kimba

Last date used for prediction: 2 July 2018
Rainfall to date: 84mm
Days with significant stubble moisture: 42

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 3-4 2
Sowing guide (based on agronomic suitability) Okay to sow but risk is medium Okay to sow but risk is medium Okay to sow
Blackspot risk Medium Medium Low

Kingsford

Last date used for prediction: 2 July 2018
Rainfall to date: 125mm
Days with significant stubble moisture: 87

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Kyancutta

Last date used for prediction: 2 July 2018
Rainfall to date: 65.7mm
Days with significant stubble moisture: 44

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 3-4 2
Sowing guide (based on agronomic suitability) Okay to sow but risk is medium Okay to sow but risk is medium Okay to sow
Blackspot risk Medium Medium Low

Lameroo

Last date used for prediction: 2 July 2018
Rainfall to date: 70mm
Days with significant stubble moisture: 41

Weekly forecast 2 July 9 July 16 July
Blackspot severity 5 5 5
Sowing guide (based on agronomic suitability) Okay to sow but risk is high High Okay to sow but risk is high High Okay to sow but risk is high High
Blackspot risk High High High

Lock

Last date used for prediction: 2 July 2018
Rainfall to date: 85mm
Days with significant stubble moisture: 53

Weekly forecast 2 July 9 July 16 July
Blackspot severity 2 2 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Maitland

Last date used for prediction: 2 July 2018
Rainfall to date: 143.5mm
Days with significant stubble moisture: 71

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Mannum

Last date used for prediction: 2 July 2018
Rainfall to date: 64.4mm
Days with significant stubble moisture: 45

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 3-4 2
Sowing guide (based on agronomic suitability) Okay to sow but risk is medium Okay to sow but risk is medium Okay to sow
Blackspot risk Medium Medium Low

Minlaton

Last date used for prediction: 2 July 2018
Rainfall to date: 109.5mm
Days with significant stubble moisture: 52

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 2 1
Sowing guide (based on agronomic suitability) Okay to sow but risk is medium Okay to sow Okay to sow
Blackspot risk Medium Low Low

Minnipa

Last date used for prediction: 2 July 2018
Rainfall to date: 57mm
Days with significant stubble moisture: 40

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 3-4 3-4
Sowing guide (based on agronomic suitability) Getting too late to sow and risk is medium Getting too late to sow and risk is medium Getting too late to sow and risk is medium
Blackspot risk Medium Medium Medium

Mount Barker SA

Last date used for prediction: 2 July 2018
Rainfall to date: 247.4mm
Days with significant stubble moisture: 102

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Murray Bridge

Last date used for prediction: 2 July 2018
Rainfall to date: 76.2mm
Days with significant stubble moisture: 47

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 3-4 2
Sowing guide (based on agronomic suitability) Okay to sow but risk is medium Okay to sow but risk is medium Okay to sow
Blackspot risk Medium Medium Low

Mypolonga

Last date used for prediction: 2 July 2018
Rainfall to date: 64.6mm
Days with significant stubble moisture: 40

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 3-4 3-4
Sowing guide (based on agronomic suitability) Okay to sow but risk is medium Okay to sow but risk is medium Okay to sow but risk is medium
Blackspot risk Medium Medium Medium

Naracoorte

Last date used for prediction: 2 July 2018
Rainfall to date: 166.8mm
Days with significant stubble moisture: 93

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Nuriootpa

Last date used for prediction: 2 July 2018
Rainfall to date: 127.2mm
Days with significant stubble moisture: 76

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Palmer

Last date used for prediction: 2 July 2018
Rainfall to date: 110.2mm
Days with significant stubble moisture: 72

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Port Broughton

Last date used for prediction: 2 July 2018
Rainfall to date: 115.9mm
Days with significant stubble moisture: 67

Riverton

Last date used for prediction: 2 July 2018
Rainfall to date: 139.9mm
Days with significant stubble moisture: 71

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Sedan

Last date used for prediction: 2 July 2018
Rainfall to date: 67.2mm
Days with significant stubble moisture: 46

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 3-4 2
Sowing guide (based on agronomic suitability) Okay to sow but risk is medium Okay to sow but risk is medium Okay to sow
Blackspot risk Medium Medium Low

Snowtown

Last date used for prediction: 2 July 2018
Rainfall to date: 132mm
Days with significant stubble moisture: 77

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Strathalbyn

Last date used for prediction: 2 July 2018
Rainfall to date: 123.2mm
Days with significant stubble moisture: 76

Weekly forecast 2 July 9 July 16 July
Blackspot severity 1 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Tumby Bay

Last date used for prediction: 2 July 2018
Rainfall to date: 82.7mm
Days with significant stubble moisture: 47

Weekly forecast 2 July 9 July 16 July
Blackspot severity 3-4 2 2
Sowing guide (based on agronomic suitability) Okay to sow but risk is medium Okay to sow Okay to sow
Blackspot risk Medium Low Low

Yeelanna

Last date used for prediction: 2 July 2018
Rainfall to date: 133.4mm
Days with significant stubble moisture: 57

Weekly forecast 2 July 9 July 16 July
Blackspot severity 2 1 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

Yorketown

Last date used for prediction: 2 July 2018
Rainfall to date: 88.2mm
Days with significant stubble moisture: 56

Weekly forecast 2 July 9 July 16 July
Blackspot severity 2 2 1
Sowing guide (based on agronomic suitability) Okay to sow Okay to sow Okay to sow
Blackspot risk Low Low Low

More information

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

SARDI

Contact information

Jean Galloway
+61 (0)8 9690 2172

Author

Kawsar Salam

Funding bodies