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Bright yellow spots on courgettes, broccoli and tomatoes


 
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westclaregrower
Rank attained: Hazel Tree
Rank attained: Hazel Tree


Joined: 07 Jun 2010
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PostPosted: Sun Jun 13, 2010 9:19 pm    Post subject: Bright yellow spots on courgettes, broccoli and tomatoes Reply with quote

Hi all,

I was in the garden tonight and I have noticed some bright yellow spots on the leaves of my courgettes, broccoli and tomatoes.

I think this happened to my courgettes last year too but I did nothing and still got a good crop.

Can anyone tell me what this is and why it might have happened? Are they lacking in anything or needing more watering?

Thanks

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michael brenock
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PostPosted: Mon Jun 14, 2010 9:09 am    Post subject: Reply with quote

a picture would aid in the diagnosis as there are a number of possible causes for yellow spots including pests diseases, minor element deficiencies, sun scold or shortage of water. if it is on every crop then it is more likely caused by temperature variations or water shortage.
michael brenock horticultural advisor (retired)
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westclaregrower
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PostPosted: Mon Jun 14, 2010 6:58 pm    Post subject: Photos of the offending yellow spots Reply with quote

Hi Michael,

I have attached some photos of my Broccoli, courgette's, Tomato and parsnip that have these spots appearing. It has only affected one of my tomatoes and on only 1 leaf on my parsnips
Any advice would be greatly appreciated as it would be a shame to have them go to waste at this stage.

Thanks WCG



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michael brenock
Rank attained: Chlorophyll for blood


Joined: 12 Aug 2008
Posts: 1275
Location: cork

PostPosted: Mon Jun 14, 2010 10:01 pm    Post subject: Reply with quote

the spots are not from any well known pest disease or deficiency. Normally I would ignore such signs as they are so small. However if they get bigger or more plentiful I would be more concerned. it just might be caused by drops of water acting as magnifying glasses and causing scorching. Always remember to look at the underside of the leaf but I think it is probably clear,there are few diseases that are common to all those crops apart from Botrytis and it is not Botrytis. it is not a toxicity /deficiency so almost by deduction it must be weather related. By the way this is never a safe reasoning for pest/disease recognition.
michael brenock horticultural advisor (retired)
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