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Damping off Print E-mail
Damping off can be the seed sowers biggest problem. This is a rapidly spreading disease, caused by a number of fungi; the attacks are very sudden and can have a devastating effect. Once infected, an entire seed tray full of seedlings can be destroyed in a matter of days.

The three main fungi that cause the disease are called Phytophthora, Pythium and Rhizoctonia, for those of you that are interested in such things.

The first sign that something is wrong is when patches of seedlings keel over and have visible damage at the bases of their stems. You may also see white fluffy fungal growth on the collapsed seedlings, or the stems of older seedlings may become distorted and wiry. The fungal spores are transmitted either by contaminated soil or by water splash. High temperatures, dense sowing, poor hygiene and waterlogged soils provide perfect conditions for this disease, but any combination of these factors can encourage it.

What can be done to prevent damping off .

Always use fresh seed compost and clean pots and trays. Make sure that any used pots are washed out thoroughly before use. Don’t use collected rainwater on the seedlings, as this may harbour harmful fungal spores. Rainwater or waret from a well will be the best water to use when the plants are established but at the start use tap water instead.  This is not ideal though as the pH can change daily, depending what the water companies put in it!

Always sow seed thinly and evenly in the seed tray, and make sure the compost is not kept waterlogged. Water initially using a copper based fungicide, which can be applied now and again as the seedlings mature. Chestnut comopund is also effective.

Wise words
There is a saying that I quite like about seed sowing; it really refers to growing plants outdoors but the quote tells me not to be too disappointed if I loose a few seedlings, as there is always something trying to get them!

“Sow seed generously; one for the rook, one for the crow, one to die and one to grow”
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