Onions

What is stephylactic burning? Recognizing and Treating Stephilitic Onion Burn

If you think that only onions suffer from Stemphylium Blight, think again: what is Stemphylium Blight? Stemphylium blight is a disease caused by the fungus Stemphylium vesicarium that attacks onions and many other vegetables, including asparagus and leeks. For more information on stemphylium blight on onions, read on.

What is stephylactic burning?

Not everyone knows or has heard of the Stemphylium leaf plague. What exactly is it? It’s a serious fungal disease that attacks onions and other crops.

It is quite easy to detect black onions in Stemphylium. The plants develop moist, yellowish lesions on the foliage. These lesions develop and change colour, becoming light brown in the centre, then dark brown or black as the spores of the pathogen develop. Look for yellow lesions on the

the side of the leaves facing the prevailing wind. They are more likely to occur in very wet and warm climates.

Stephilus onion blight first appears on the leaf tips and leaves, and the infection does not usually spread to the bulb scales. In addition to onions, this fungal disease attacks :

  • Asparagus
  • Leeks
  • Garlic
  • Sunflowers
  • Handle
  • European pear
  • Radish
  • Tomatoes

Prevention of onion blight with Stemphyliuim

You can make efforts to prevent Stemphyliuim Onion Burn by following these cultural steps :

Remove all plant debris at the end of the growing season. Thoroughly clean leaves and stems from all garden litter.

It also ensures that the rows of planted onions follow the direction of the prevailing wind. This limits the time the foliage is wet and promotes good air circulation between the plants.

For the same reasons, it is preferable to maintain a low plant density. The likelihood of having onions with stemphylium blight is much lower if a good distance between plants is maintained. Also ensure that the soil in which you plant the onions provides excellent drainage.

If onions with stemphylium blight have appeared in your garden, it is worth checking for blight resistant selections. In India, VL1 X Arka Kaylan produces high quality resistant bulbs. The Welsh onion ( Allium fistulosum ) is also resistant to Stemphylium leaf blight. Ask your garden centre or order the late blight resistant varieties online.

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