Q.Red tip
Why did my red tip shrub die suddenly? It one of 4 in a row. The rest are fine.
Downtoearthdigs
Answered on March 11, 2017
Red Bud Photinia are prone to disease.
This sounds very much like Verticullum wilt.
Examine the leaves and stems of your shrubs and remove the dead plant material to lessen the exposure to your remaining plants.
Here are some links with more information.
https://www.gardeningknowhow.com/ornamental/shrubs/photinia/pruning-photinia-shrubs.htm
https://www.gardeningknowhow.com/ornamental/shrubs/photinia/photinia-leaf-spot.htm
https://www.gardeningknowhow.com/ornamental/shrubs/photinia/rejuvenating-red-tip-photinia.htm
https://www.clemson.edu/extension/horticulture/nursery/ipm/book_files/chapter_12
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