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UC Master Gardener Program of Contra Costa County
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3.3. Pest Triangle

Vegetable Gardening - Handbook for Beginners
Chapter 3.3.

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Pest Triangle

Disease, insects, and weed seeds are always present in garden locations. All these infectious triangle components must be present in order for one of these pests to become established. 

Diseases 

The likelihood of disease is less if the plants are resistant varieties, in the wrong life stage, or spaced far enough apart for good air circulation. 

Insects

The likelihood of pests will be less if the plants are healthy, slow-growing, and spaced far enough apart for good air circulation. 

Weeds 

The likelihood of weeds germinating is less with a 3”-4” layer of organic mulch.


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