There's been many times I nearly quit - so here's hoping the garden continues to teach me things that I can pass along to you!
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The Black Knot becomes active during warm, wet weather. "Ascospores" are forcibly released from the ascostromata of the fungus. On this sample, it had rained a lot overnight with strong winds. You can see the knot has white masses. Beginning a new life cycle on the blackened gall. Those white spots contain the acospores. These spores are spread by air currents and rain splashing.