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Cedar Quince Rust Info / Symptoms:

Cedar-apple rust, cedar-hawthorn rust, and cedar-quince rust are closely related rust diseases that require two hosts to complete their life cycle. All three rusts can infect most varieties of eastern red cedar as well as many other junipers and an alternate host. Cedar-quince rust has the broadest host range and can affect many genera in the rose family including apple, crabapple, pears, quince, hawthorn, serviceberry, mountain-ash, flowering quince, cotoneaster, chokeberry, and photinia.

Each plant will respond differently to the disease, but generally they will have some type of rust color on their leaves, needles, or fruit. Trees like crabapple and serviceberry can have rust-colored spikes on their fruit if infected. If you notice any of these symptoms on your tree or shrub, send us a photo or bring in a sample for proper diagnosis.

Control Methods:

Bonide Infuse™ Systemic Disease Control is the fungicide that we recommend using for the treatment of Cedar Quince Rust. This product can be used on trees that you do not intend to eat the fruit from. If you are looking for an organic method, or if you intend to harvest the fruit on an affected tree, please use Bonide Copper Fungicide. See chart below for timing and frequency recommendations. 

Application #1 Application #2
Buds break & leaves are approximately 1/3 their mature size 7-10 days after initial application
Application #3 Application #4
7-10 days after second application 7-10 days after third application

Cedar Quince Rust on a Hawthorn from Missouri Botanical Garden