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Shrub Rugosa Rose buds turning yellow, failing to open and rotting.

What is going on here? These are two separate bud clusters.

The first is the buds that have been turning yellow and just not opening. The second is a cluster of buds that I thought looked healthy, and are now opening and look rotten inside.

Zone 6A, only issue I've seen on these plants are Japanese beetles and mites, but I took care of the mites a month ago with a series of soap/pepper sprays.

It has been very, very dry here, and I have not over-watered them.

The first flush of blooms was beautiful, but there are yellow clusters like this everywhere (I have about 12 of these bushes).

Any ideas?

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