Field pea blackspot management guide for Western Australia - 13 June 2018

Page last updated: Thursday, 14 June 2018 - 1:34pm

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 11 June 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

Bencubbin

Last date used for prediction: 12 June 2018. Rainfall to date: 92.1mm
Days with significant stubble moisture: 28

12 June 19 June 26 June
9% spore released - blackspot risk high 21% spore released - blackspot risk high 36% spore released - blackspot risk medium
Do not sow Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Boyup Brook

Last date used for prediction: 12 June 2018. Rainfall to date: 186.6mm
Days with significant stubble moisture: 46

12 June 19 June 26 June
46% 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 Sow – do not sow dry

Cunderdin

Last date used for prediction: 12 June 2018. Rainfall to date: 99.7mm
Days with significant stubble moisture: 39

12 June 19 June 26 June
29% spore released - blackspot risk high 46% spore released - blackspot risk medium 62% spore released - blackspot risk low
Do not sow Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Dowerin

Last date used for prediction: 12 June 2018. Rainfall to date: 101.2mm
Days with significant stubble moisture: 35

12 June 19 June 26 June
21% spore released - blackspot risk high 36% spore released - blackspot risk medium 53% spore released - blackspot risk medium
Sow - do not sow dry Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Gairdner

Last date used for prediction: 12 June 2018. Rainfall to date: 71.6mm
Days with significant stubble moisture: 48

12 June 19 June 26 June
50% 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

Jacup

Last date used for prediction: 12 June 2018. Rainfall to date: 98.4mm
Days with significant stubble moisture: 57

12 June 19 June 26 June
70% 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 Sow – do not sow dry

Katanning

Last date used for prediction: 11 June 2018. Rainfall to date: 136mm
Days with significant stubble moisture: 48

11 June 18 June 25 June
50% 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 Do not sow – high yield loss for late sowing

Kojonup

Last date used for prediction: 12 June 2018. Rainfall to date: 175mm
Days with significant stubble moisture: 56

12 June 19 June 26 June
68% spore released - blackspot risk low 80% spore released - blackspot risk low 89% spore released - blackspot risk low
Sow – do not sow dry Sow – do not sow dry Do not sow – high yield loss for late sowing

Kondinin

Last date used for prediction: 12 June 2018. Rainfall to date: 118.9mm
Days with significant stubble moisture: 51

12 June 19 June 26 June
57% spore released - blackspot risk medium 72% spore released - blackspot risk low 83% spore released - blackspot risk low
Sow – do not sow dry Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Lake King

Last date used for prediction: 12 June 2018. Rainfall to date: 98.4mm
Days with significant stubble moisture: 56

12 June 19 June 26 June
68% spore released - blackspot risk low 80% spore released - blackspot risk low 89% spore released - blackspot risk low
Sow – do not sow dry Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Merredin

Last date used for prediction: 12 June 2018. Rainfall to date: 90.4mm
Days with significant stubble moisture: 37

12 June 19 June 26 June
25% spore released - blackspot risk high 41% spore released - blackspot risk medium 57% spore released - blackspot risk medium
Do not sow Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Mingenew

Last date used for prediction: 12 June 2018. Rainfall to date: 156.9mm
Days with significant stubble moisture: 35

12 June 19 June 26 June
21% spore released - blackspot risk high 36% spore released - blackspot risk medium 53% spore released - blackspot risk medium
Do not sow Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Moora

Last date used for prediction: 12 June 2018. Rainfall to date: 148.1mm
Days with significant stubble moisture: 42

12 June 19 June 26 June
36% spore released - blackspot risk medium 53% spore released - blackspot risk medium 68% spore released - blackspot risk low
Do not sow Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Mount Howick

Last date used for prediction: 11 June 2018. Rainfall to date: 155mm
Days with significant stubble moisture: 73

11 June 18 June 25 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 Do not sow – high yield loss for late sowing

Mt Barker

Last date used for prediction: 12 June 2018. Rainfall to date: 127.5mm
Days with significant stubble moisture: 70

12 June 19 June 26 June
89% spore released - blackspot risk low 95% spore released - blackspot risk low 98% spore released - blackspot risk low
Sow – do not sow dry Sow – do not sow dry Sow – do not sow dry

Mullewa

Last date used for prediction: 12 June 2018. Rainfall to date: 132.5mm
Days with significant stubble moisture: 37

12 June 19 June 26 June
25% spore released - blackspot risk high 41% spore released - blackspot risk medium 57% spore released - blackspot risk medium
Do not sow Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Newdegate

Last date used for prediction: 12 June 2018. Rainfall to date: 73.6mm
Days with significant stubble moisture: 51

12 June 19 June 26 June
57% spore released - blackspot risk medium 72% spore released - blackspot risk low 83% spore released - blackspot risk low
Sow – do not sow dry Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Northam

Last date used for prediction: 12 June 2018. Rainfall to date: 153.2mm
Days with significant stubble moisture: 36

12 June 19 June 26 June
23% spore released - blackspot risk high 38% spore released - blackspot risk medium 55% spore released - blackspot risk medium
Do not sow Do not sow Do not sow – high yield loss for late sowing

Pingrup

Last date used for prediction: 12 June 2018. Rainfall to date: 77.8mm
Days with significant stubble moisture: 44

12 June 19 June 26 June
41% spore released - blackspot risk medium 57% spore released - blackspot risk medium 72% spore released - blackspot risk low
Sow - do not sow dry Sow - do not sow dry Do not sow – high yield loss for late sowing

Salmon Gums

Last date used for prediction: 11 June 2018. Rainfall to date: 175mm
Days with significant stubble moisture: 60

11 June 18 June 25 June
75% spore released - blackspot risk low 86% spore released - blackspot risk low 93% spore released - blackspot risk low
Sow – do not sow dry Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Scaddan

Last date used for prediction: 11 June 2018. Rainfall to date: 218.2mm
Days with significant stubble moisture: 57

11 June 18 June 25 June
70% spore released - blackspot risk low 82% spore released - blackspot risk low 90% spore released - blackspot risk low
Sow – do not sow dry Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Tammin

Last date used for prediction: 12 June 2018. Rainfall to date: 87.8mm
Days with significant stubble moisture: 38

12 June 19 June 26 June
27% spore released - blackspot risk high 43% spore released - blackspot risk medium 59% spore released - blackspot risk medium
Do not sow Do not sow – high yield loss for late sowing Do not sow – high yield loss for late sowing

Toodyay

Last date used for prediction: 12 June 2018. Rainfall to date: 195.9mm
Days with significant stubble moisture: 40

12 June 19 June 26 June
31% spore released - blackspot risk medium 48% spore released - blackspot risk medium 64% spore released - blackspot risk low
Do not sow Sow – do not sow dry Do not sow – high yield loss for late sowing

Contact information

Jean Galloway
+61 (0)8 9690 2172

Author

Kawsar Salam

Funding bodies