Harvard LTER Schoolyard Program

Hemlock Woolly Adelgid (SY002)

The data file contains the following variables:

1. School = school code
2. Teacher = teacher's last name
3. Date = date of observation (YYYY-MM-DD)
4. Julian = Julian day
5. TreeID = tree number
6. Health = tree crown health. 0 = healthy - all green. 1 = some bare branches. 2 = unhealthy - half or more bare branches. 3 = dead - no green needles.
7. Wool = presence of woolly adelgid. 0 = absent. 1 = present.
8. Eggs = average number of egg sacks per branch
9. Growth = average new growth at branch tips in centimeters