Posted: 08/01/2014 at 21:48
Clueless - Think I may have watched the programme. The spray was used on hosta's in the garden to repel slugs and snails, not to prevent damping off.
Haven't got a spray recipe but vermisculite helps prevent damping off, a thin layer on sowed seeds allows light in for germination but will help prevent the stems from getting to wet/moist when they germinate by absorbing excessive moisture which it then releases as the compost dries. Watering from underneath also helps to prevent damping off, and you'll know when to stop watering because when vermisculte becomes saturated it changes colour and will be darker.
When potting up new seedlings you don't need to cover all the compost in the pot just ensure vermisculite is around the stem.
Garlic spray however is ever so effective for detering slugs and snails if started early, in March, before the little critters start appearing