Field pea blackspot management guide for South Australia - 9 April 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.

High blackspot risk for 2018

Early forecasts point to a high risk of blackspot in seedling field pea crops across most of South Australia in 2018. The extremely dry summer and autumn has delayed the maturation of blackspot spores on field pea stubbles. This means the spores will be released with rainfall in late autumn and winter, when the new crops are emerging and establishing. Growers should prepare for a high risk of blackspot establishing in their crops.

For information on blackspot management, refer to High blackspot risk forecast for SA in 2018.

Key to blackspot severity scores

Table 1 Percentage yield loss (in years) for different levels of blackspot scenarios
Blackspot severity 5 out of 10 years 3 out of 10 years 1 out of 10 years
1 0 0 0
2 2 5 15
3-4 20 25 35
5 25 30 50

Balaklava

Rainfall to date: 20mm; days with significant stubble moisture: 14

Weekly forecast 9 April 16 April 23 April
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

Rainfall to date: 26mm; days with significant stubble moisture: 32

Weekly forecast 9 April 16 April 23 April

Blackspot severity

5

5

3-4

Sowing guide (based on agronomic suitability)

Too early to sow

Too early to sow

Too early to sow

Blackspot risk

High

High

Medium

Bordertown

Rainfall to date: 22mm; days with significant stubble moisture: 21

Weekly forecast 9 April 16 April 23 April

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: 20mm; days with significant stubble moisture: 7

Weekly forecast 9 April 16 April 23 April

Blackspot severity

5

5

3-4

Sowing guide (based on agronomic suitability)

Too early to sow

Too early to sow

Too early to sow

Blackspot risk

High

High

Medium

Crystal Brook

Rainfall to date: 20mm; days with significant stubble moisture: 7

Weekly forecast 9 April 16 April 23 April

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

Eudunda

Rainfall to date: 39mm; days with significant stubble moisture: 26

Weekly forecast 9 April 16 April 23 April

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

Keith

Rainfall to date: 17mm; days with significant stubble moisture: 11

Weekly forecast 9 April 16 April 23 April

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: 19mm; days with significant stubble moisture: 12

Weekly forecast 9 April 16 April 23 April

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

Kimba

Rainfall to date: 24mm; days with significant stubble moisture: 8

Weekly forecast 9 April 16 April 23 April

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

Kingsford

Rainfall to date: 32mm; days with significant stubble moisture: 34

Weekly forecast 9 April 16 April 23 April

Blackspot severity

5

5

3-4

Sowing guide (based on agronomic suitability)

Too early to sow

Too early to sow

Too early to sow

Blackspot risk

High

High

Medium

Kyancutta

Rainfall to date: 27mm; days with significant stubble moisture: 15

Weekly forecast 9 April 16 April 23 April

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

Lameroo

Rainfall to date: 10mm; days with significant stubble moisture: 7

Weekly forecast 9 April 16 April 23 April

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: 35mm; days with significant stubble moisture: 21

Weekly forecast 9 April 16 April 23 April

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: 33mm; days with significant stubble moisture: 30

Weekly forecast 9 April 16 April 23 April

Blackspot severity

5

5

3-4

Sowing guide (based on agronomic suitability)

Too early to sow

Too early to sow

Too early to sow

Blackspot risk

High

High

Medium

Mannum

Rainfall to date: 21mm; days with significant stubble moisture: 16

Weekly forecast 9 April 16 April 23 April

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

Minlaton

Rainfall to date: 14mm; days with significant stubble moisture: 13

Weekly forecast 9 April 16 April 23 April

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

Rainfall to date: 23mm; days with significant stubble moisture: 16

Weekly forecast 9 April 16 April 23 April

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: 41mm; days with significant stubble moisture: 43

Weekly forecast 9 April 16 April 23 April

Blackspot severity

3-4

3-4

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

Rainfall to date: 20mm; days with significant stubble moisture: 15

Weekly forecast 9 April 16 April 23 April

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

Mypolonga

Rainfall to date: 19mm; days with significant stubble moisture: 10

Weekly forecast 9 April 16 April 23 April

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

Naracoorte

Rainfall to date: 31mm; days with significant stubble moisture: 34

Weekly forecast 9 April 16 April 23 April

Blackspot severity

5

5

3-4

Sowing guide (based on agronomic suitability)

Too early to sow

Too early to sow

Too early to sow

Blackspot risk

High

High

Medium

Palmer

Rainfall to date: 27mm; days with significant stubble moisture: 24

Weekly forecast 9 April 16 April 23 April

Blackspot severity

5

5

3-4

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: 26mm; days with significant stubble moisture: 15

Weekly forecast 9 April 16 April 23 April

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

Riverton

Rainfall to date: 34mm; days with significant stubble moisture: 27

Weekly forecast 9 April 16 April 23 April

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: 32mm; days with significant stubble moisture: 27

Weekly forecast 9 April 16 April 23 April

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

Tumby Bay

Rainfall to date: 16mm; days with significant stubble moisture: 8

Weekly forecast 9 April 16 April 23 April

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

Yeelanna

Rainfall to date: 28mm; days with significant stubble moisture: 16

Weekly forecast 9 April 16 April 23 April

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

Yorketown

Rainfall to date: 13mm; days with significant stubble moisture: 6

Weekly forecast 9 April 16 April 23 April

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

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: Thursday, 12 April 2018 - 2:49pm