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Hansen's Plant Pest Library is an invaluable resource for Missouri homeowners who want to learn more about pests and diseases that can affect their trees.


Mycoplasmas are parasites that infect plants and animals. In plants, mycoplasma infection moves throughout the tree’s vascular system. Infection can be slow to see, leading to a gradual decline in tree health and even death in the span of a few months to a few years.

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