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What is causing the stems of my alliums to blacken and collapse?

P10

P10 Posts: 2

May 2021 in Problem solving

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BobTheGardener Posts: 11,385

May 2021

Have a look for signs of Allium Leaf Miner. The damage they cause can let in fungal infections, which is what that looks like to me.
https://www.gardenfocused.co.uk/fruitarticles/pest-disease/allium-leaf-miner.php

A trowel in the hand is worth a thousand lost under a bush.
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P10 Posts: 2

May 2021

Thank you

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