Green et al. 1990 Systematic approach to diagnosing plant damage.
Excellent beginning reference to determine what might be damaging plants. Includes great comparisons between fungus/bacteria, and various insect pests. Not specific to plant genera, this is a big picture reference to help narrow down what is causing plant damage observed. ORNAMENTALS NORTHWEST ARCHIVES. 1990. Vol.13, Issue 6. Pages ii-24.
Green 1990 Systematic approach to diagnosing plant damage.pdf
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