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Tomato blight is a disease caused by a fungus-like organism which spreads rapidly in the foliage and fruit of tomatoes - typically in wet weather, causing them to collapse and decay.
In particular, it is a serious disease outdoor tomatoes, but not as common on tomatoes grown in greenhouses.
Blight is specific to tomatoes and potatoes, and some ornamental relatives of these two crops are also susceptible. Cases have been recorded on some ornamental Solanum species as well as bedding Petunias.
Symptoms of Tomato Blight
How to Control Tomato Blight
Perhaps the biggest problem with blight on tomatoes is with its cousin the humble potato. With the majority of potato varieties being highly susceptible to this virulent fungus, the late summer air is full of pathonogenic spores just waiting for a suitable host plant to infect. It's Unfortunate that the closely related tomato plant more than readily fits the bill.
This can be a particular problem with tomatoes, especially when grown outside in the more temperate regions of the country. With the late cropping of most true outdoor varieties – and even later cropping if glasshouse varieties are grown outside – the ripening fruit will often coincide with the seasonal incidence of ‘Late Blight’. If the late summer season is particularly hot and humid, your tomato crops will probably stand little hope of survival and your years worth of work can end up as another pile being burned at the local incinerator.
As a safety net, when wet weather is forecast from June onwards, begin applications of protectant sprays as a matter of course.
Blight Resistant Tomato Varieties
This particular variety was bred in the USA by Dr. Jim Baggett at Oregon State University. In recent tests ‘Legend’ had shown impressive blight tolerance, and in particular during trials in a ‘garden’ situation. It produces large, glossy red fruits with an expected crop of up to 6lbs per plant. The fruit have a slightly flatter shape compared to the norm and come almost completely seedless. Fortunately for most gardeners, best results are produced when the plants were grown outdoors but they are also perfectly fine for growing under glass. They have an excellent flavour and should be sown 6-8 weeks before expected lasts frosts - in the United Kingdom this will be any time from March onwards.
TOMATO ‘FERLINE’ F1 Hybrid
Not only has this new variety shown excellent tolerance to ‘Late Blight’, it has also proven itself to be highly resistant against both fusarium wilt and verticillium wilt. As with the new ‘Legend’ cultivar, ‘Ferline’ has also tested extremely well in garden trials. It produces heavy crops – up to 5lbs per plant – of flavoursome, deep red fruits. Although it does well sown outdoors ‘Ferline’ is also suitable for growing under glass.
TOMATO ‘FANTASIO’ F1 Hybrid
This is a deliciously flavoured variety that has also trialled well in the garden situation against ‘Late Blight’ infection. In fact it has also shown good resistance to Tobacco Mosaic Virus, Verticilium wilt, Fusarium Wilts, and nematodes too. Tomato ‘Fantastico will bear you a good crop of round fruits, with each plant producing up to around 6lbs of tomatoes.
For related articles click onto:
Blight Resistant Tomatoes
Common Insect Pests on Tomatoes
Common Tomato Pests and Diseases
Flea Beetles on Tomato Plants
Grey Mould on Tomatoes
How to Collect and Prepare Tomato Seeds for Propagation
How to Control Blackfly on Tomato Plants
How to Control Greenhouse Whitefly on Tomato Plants
How to Control Leaf Miner on Tomato Plants
How to Control Mosaic Virus on Tomato Plants
How to Grow Basil from Seed
How to Grow Basil from Seed Indoors
How to Grow Tomatoes?
How to Grow Tomatoes from Seed
How to Grow Greenhouse Tomato Plants from Seed
How to Grow Tomatoes - Growbags or Soil?
Organic Control of Grey Mould on Tomato Plants
Recipe for Tangy Tomato Soup
Red Spider Mite on Tomatoes Plants
Salad Crops for Late Summer/Autumn Planting
The 'Garden of Eaden' Seed Shop
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Photo care of http://www.gardenersworld.com/how-to/problem-solving/tomato-blight/ and http://www.thegardenersalmanac.co.uk/Data/Tomato%20problems/Tomato%20problems.htm and http://www.allotmentgardening.org.uk/potato-and-tomato-blight/