Sometimes many trees get sick and die very quickly. I look at how death moves between different kinds of trees and how groups of different trees change how fast death moves. I try to figure out when many trees will die together, and the type of things we need to know in order to figure this out ahead of time. Then I try to figure out what to do to the trees over time using the least money so that death probably will not come, even if our ideas of how death moves might be wrong or off a bit.
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