Need an expert opinion! Cucumber / Tomato Plants
Last post 12-06-2012 9:27 AM by headfullofbees. 6 replies.
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09/06/2012 05:15 PM
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- presquevu
- London
- 09 Jun 2012
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1
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Hi there,
New member and completely new gardener here! Hope you don't mind a quick question?
I have been growing some cucumber and tomato plants one of those little
polythene grow houses. It's placed in quite a sunny spot in the garden
(when there is sun that is!).
Recently I have noticed some of the plants have developed yellowish patches,
I've added some pics below.
Is this anything to be worried about? I have around forty plants and am a bit
concerned this might be some sort of fungus / virus that could spread.
Any help would be taken most gratefully!
http://dl.dropbox.com/u/1414416/plants/photo-1.JPG
http://dl.dropbox.com/u/1414416/plants/photo-2.JPG
http://dl.dropbox.com/u/1414416/plants/photo.JPG
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10/06/2012 07:47 AM
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- madmuncher
- Nottinghamshire
- 20 Mar 2010
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140
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Umm...  ..ok...have a look underneath the 'mottled' leaves. Now you will need good eye sight as you are going to be looking for very minute things..but can you see anything crawling underneath the leaves..like tidy specks of 'dust'? It just looks to me like like you would have red spider mite damage on the leaves. If you can see some 'creepy crawlies'...I would recommend washing the leaves under luke warm water for several times over next week or so before you plant them into permanent positions and after that keep spray bottle of water with drop of washing up liquid nearby and give them a squirt every now and then. Red spider mites will kill you plants if not kept in check...but if you manage to keep their numbers low your plants may not look picture perfect but will still grow and crop well. Red sprider mites don't like humidity but thrive in dry and warm environment. BUT...as the weather has been..anything and everything is possible..even the sunlight or lack of it can have funny effects to the leaves.
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10/06/2012 08:09 AM
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I can't see the photos, but often yellowing on tomato and cucumber plants is due to magnesium deficiency. Try a handful of horticultural epsom salts per watering can, and give each plant about a pint (500ml).
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10/06/2012 08:55 AM
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- madmuncher
- Nottinghamshire
- 20 Mar 2010
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140
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10/06/2012 08:57 AM
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- madmuncher
- Nottinghamshire
- 20 Mar 2010
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140
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I copied and pasted one your photos to everybody to see... I doesn't look like deficiency to me.
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10/06/2012 01:31 PM
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Hello another newbie here, just found this on a Q&A site, wonder if one of these could help you? My tomato plants are really far behind this year but picking up now. 1) Plants are too dry.
2) Plants are too wet.
3) Foliar leaf damage from a bacteria or virus, especially if the yellowing of the leaves is accompanied by small dark spots (probably bacterial speck) or larger brown spots with concentric circles (probably early blight).
4) A more serious disease like verticillium wilt or fusarium wilt.
5) Nutritional deficiency, with the likely culprit being a lack of one of the following: nitrogen, iron, zinc, potassium, or calcium.
6) Aphids or spider mites.
7) Root-knot nematodes. Only a issue if you are growing them in sandy soil though.
8) Tobacco mosaic virus.
9) Being too close to--and especially if grown directly underneath--a black walnut tree or trees.
Hope one of them suits your circumstances! :)
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12/06/2012 09:27 AM
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Madmuncher is right, imv. it doesn't look like magnesium deficiency. I'd still be tempted to treat the plants in two ways: 1) Dilute liquid soap spray to BOTH sides of the leaves to deter infestation. 2) Treatment with seaweed extract to rule out malnourishment. Doesn't look like TMV or Fusarium/Verticillium, but if it is a virus, you'll lose the plants anyway.
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