Is This A Normal Fungus

Question

We have grown grapes successfully for years, but lost a lot to a fungal infection last year. On the advice of a local vineyard we sprayed with a copper fungicide at bud burst this year.Initially the bunches looked very healthy but have suddenly shrivelled and turned brown This has happened during the recent heatwave. Could the heat have affected them?. If not, can you suggest something else we can do please?

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Answer 1

It could be black rot, a fungal disease. Here is more:

https://extension.umd.edu/resource/grape-diseases

https://www.gardeningknowhow.com/edible/fruits/grapes/preventing-pierces-disease.htm