The Free Press, Mankato, MN

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October 2, 2013

Extension column: Rust fungi infect fall blooming perennials

(Continued)

Dense beds should be thinned and overgrown plants divided. Water with drip irrigation or use sprinklers early on a sunny day so leaves dry quickly. Mulch the soil with wood chips or other organic matter to keep soil moisture from evaporating and increasing humidity in the plant canopy. Plants with a history of infection can be scouted regularly throughout the summer. As rust infection develops on a few leaves, theses leaves can be pinched off and buried to reduce spread of the pathogen.

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