Online Phenology Models and Degree-day Calculator
single weedweed groupweed closeup
downy brome
weed model of Dan Ball etal 2004 publication (pdf)

Output from weed degree-day/phenology model program:
	Heat Units and predictions of key events from daily weather data
==============================MODEL INPUTS================================ Model species/general links: downy brome Type: weed Model source/other links: Dan Ball etal 2004 publication (pdf) Calculation method: simp avg/grow Lower threshold: 32 degrees Fahrenheit Setting upper threshold to: 130 F (default) Directions for starting/BIOFIX: calendar date Starting/BIOFIX date: 1 1 No ending date, set to: default date 12 31 Model validation status: validated - see publication Region of known use: inland Pacific NW ==============================EVENTS TABLE================================ 1. 1440 cumulative GDD after Jan 1 panicle (seedhead) emergence 2. 1800 cumulative GDD after Jan 1 beginning of seed production 3. 2430 cumulative GDD after Jan 1 physiological maturity ==============================MODEL OUTPUT================================ Weather station: 1000 none selected mn day max min precip DD32 CUMDD32 event -- --- ----- ----- ------ ---- ------- -------