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Tomato blight prevention

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Question from Clive Giddens


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Hi, I have tried to grow tomato's for 2 years now but to no success, I seem to have had blight, is it best to spray a fungicide as a prevention if so at what stage? any other help would be great. some plants in green house, some out side, cherry variety.

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  • Replies: 1
  • Posted: Fri. 8th May 2009 23:01

Preventing blight

Reply from Kathy C

Hi, Clive,
Though we can't control the weather (blight likes cool, damp, wet, weather, this is what I have been told works well in preventing blight:
- Apply a mulch under the plants to prevent water from splashing up on the leaves (water encourages the fungus to grow).
- Water in the early morning - not overnight as this creates a very humid environment aroung the plant and water will be on the leaves longer rather than 'burning off' in the morning sun.
- Make sure there is enough space between the plants.
- Avoid working around the plants when they are wet.
- Remove and destroy any diseased branches as soon as you see them.
- Avoid planting tomatoes where tomatoes, peppers, potatoes or aubergines were planted the year before.
- Choose disease resistant varieties - heirloom types tend to be more prone to blight than newer cultivars.
- Weed, weed, weed!
- Thoroughly clean away dead plants and debris in autumn - this is VERY important since some blights overwinter in plant residue and are soil-borne.
- Feed as regularly as recommended by whichever fertiliser you choose to use - a healthy plant will be better able to fight disease.
Many experts say not to bother with fungicides because once you see the symptoms/signs, it is too late. However, you can use it as soon as you see the first sign of blight. It can't hurt and just might keep it at bay. I have heard that using black landscape fabric has been very effective at preventing blight but I haven't used it myself.
Hope this is of some help. Please let me know how you get on.
Kathy C.

  • Posted: Wed. 13th May 2009 04:47