E.+HawksworthDMTRatingExample.pdf

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Malheur National Forest-Fuels Reduction BPA
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1240BE23Q0016
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HAWKSWORTH

DWARF MISTLETOE RATING SYSTEM

(1977)

DWARF MISTLETOE SEVERITY RATING INSTRUCTIONS

Step 1: Divide live crown into thirds.

Step 2: Rate each third separately. Each third should be given a rating of 0, 1, or 2, as described below:

(0) No visible infections.

(1) Light infection (½ or less of the total number of branches in the crown third are infected).

(2) Heavy infection (more than ½ of total number of branches in the crown third are infected)

Step 3: Finally, add ratings of thirds to obtain rating for total tree. In the example below, the dwarf mistletoe rating is 3 (top (0) + middle (1) + bottom (2)).

Figure 1: Sample: tree divided into thirds

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