Field pea blackspot management guide for South Australia - 21 April 2020

Page last updated: Thursday, 23 April 2020 - 1:59pm

Please note: This content may be out of date and is currently under review.

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 20 April 2020 from the nearest weather station.

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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

Balaklava

Rainfall to date: 53.9 mm. Days with significant stubble moisture: 22

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Blyth (Hart)

Rainfall to date: 102.6 mm. Days with significant stubble moisture: 29

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Bute

Rainfall to date: 87.4 mm. Days with significant stubble moisture: 38

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	3 to 4	3 to 4
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	Medium	Medium

Ceduna

Rainfall to date: 54.8 mm. Days with significant stubble moisture: 24

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Clare

Rainfall to date: 133.1 mm. Days with significant stubble moisture: 40

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	3 to 4	3 to 4	3 to 4
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	Medium	Medium	Medium

Crystal Brook

Rainfall to date: 118.9 mm. Days with significant stubble moisture: 36

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	3 to 4
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	Medium

Eudunda

Rainfall to date: 60.2 mm. Days with significant stubble moisture: 23

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Farrell Flat

Rainfall to date: 94.5 mm. Days with significant stubble moisture: 29

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Marginally early
Blackspot risk	High	High	High

Keith

Rainfall to date: 90.3 mm. Days with significant stubble moisture: 27

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Kent Town

Rainfall to date: 101.8 mm. Days with significant stubble moisture: 39

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	3 to 4	2
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	Medium	Low

Kimba

Rainfall to date: 66.2 mm. Days with significant stubble moisture: 29

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Kyancutta

Rainfall to date: 54.2 mm. Days with significant stubble moisture: 29

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Lock

Rainfall to date: 58.2 mm. Days with significant stubble moisture: 27

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Maitland

Rainfall to date: 90 mm. Days with significant stubble moisture: 31

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	3 to 4
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	Medium

Minlaton

Rainfall to date: 62.2 mm. Days with significant stubble moisture: 28

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Minnipa Pirsa

Rainfall to date: 89 mm. Days with significant stubble moisture: 28

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Mount Barker

Rainfall to date: 113.1 mm. Days with significant stubble moisture: 47

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	3 to 4	3 to 4	2
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	Medium	Medium	Low

Murray Bridge (Mypolonga)

Rainfall to date: 49.8 mm. Days with significant stubble moisture: 30

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	3 to 4
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	Medium

Naracoorte

Rainfall to date: 62.7 mm. Days with significant stubble moisture: 28

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Nuriootpa

Rainfall to date: 61.2 mm. Days with significant stubble moisture: 26

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Palmer

Rainfall to date: 56.8 mm. Days with significant stubble moisture: 30

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	3 to 4
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	Medium

Port Broughton

Rainfall to date: 84.4 mm. Days with significant stubble moisture: 34

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	3 to 4
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	Medium

Riverton

Rainfall to date: 64.1 mm. Days with significant stubble moisture: 22

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Sedan

Rainfall to date: 61.2 mm. Days with significant stubble moisture: 21

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	5
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	High

Snowtown

Rainfall to date: 76 mm. Days with significant stubble moisture: 36

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	5	5	3 to 4
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	High	High	Medium

Strathalbyn

Rainfall to date: 93.9 mm. Days with significant stubble moisture: 43

Weekly forecast	20 Apr	27 Apr	4 May
Blackspot severity	3 to 4	3 to 4	2
Sowing guide (based on agronomic suitability)	Too early to sow	Too early to sow	Too early to sow
Blackspot risk	Medium	Medium	Low