Knock-out Roses half dead...Why and what can I do for it?
I live in St Charles, MO. We've had knock-out roses planted for 6 years. Last year we started having problems with Japanese Beetles and lost one and some of the others have had problems. But this particular Knock-out hasn't had a huge problem with them this year. Half of the shrub is dying. The other half is still thriving, although I'm seeing a few yellow leaves with brown spots and a few leaves with chew marks. What's going on?
Knock out roses generally are hardy, but over the past several winters, some have shown dieback. Your rose may simply be showing delayed winter injury. If half of the plant is thriving, it may grow and fill in fully. The description of the damage that you provide doesn't sound like any particular disease problem.
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