Cougarblight Fire Blight Risk Model

edge graphic Cougarblight Fire Blight
Risk Model (Version 2001) Tim Smith, WSU Extension

Four Day Degree Hour Total Thresholds

Potential Pathogen Presence Estimated by Fire Blight History(Below)
LOW RISK
MARGINAL RISK
HIGH RISK IF FLOWERS PRESENT
EXTREME RISK IF FLOWERS PRESENT

No fire blight in the area during the past two seasons.
0 - 400
400 - 500
500 - 800
800+

Blight present in the region, but not near your orchard, last year.
0 - 350
350 - 400
400 - 650
650+

Blight in your or neighboring orchard last year.
0 - 150
150 - 300
300 - 500
500+

Active Blight strikes or cankers are presently in your or neighboring orchard.
0 - 100
100 - 200
200 - 350
350+

Potential Pathogen Presence Estimated by Fire Blight History(Below)	LOW RISK	MARGINAL RISK	HIGH RISK IF FLOWERS PRESENT	EXTREME RISK IF FLOWERS PRESENT
No fire blight in the area during the past two seasons.	0 - 400	400 - 500	500 - 800	800+
Blight present in the region, but not near your orchard, last year.	0 - 350	350 - 400	400 - 650	650+
Blight in your or neighboring orchard last year.	0 - 150	150 - 300	300 - 500	500+
Active Blight strikes or cankers are presently in your or neighboring orchard.	0 - 100	100 - 200	200 - 350	350+