Pacific Northwest Plant Disease Management Handbook

Resistance

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Latest revision: 
March 2024
Resistance

The crab-apple trees in the foreground have scab but the tree on the left has much more foliage since it is a resistant type. (The sycamores in the background have lost many leaves due to anthracnose).

Jay W. Pscheidt, 2010.

The sum of the qualities of the host and causal agent that retard the activities of the causal agent.

Pscheidt, J.W., and Ocamb, C.M. (Senior Eds.). 2024 Pacific Northwest Plant Disease Management Handbook.
© Oregon State University.

Use pesticides safely!

  • Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
  • Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
  • Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

Trade-name products and services are mentioned as illustrations only. This does not mean that the participating Extension Services endorse these products and services or that they intend to discriminate against products and services not mentioned.

H - Home garden packaging commonly available.     O - Acceptable in organic production.