Thanks to the Landreth Seed Co. for the following info:
This is a ‘heads-up’. It is not meant to alarm or frighten. The intent is to educate and inform.
During the 2012 gardening season, blight is going to be a problem. Early season, mid season and late season blight are going to be a problem for tomatoes and potatoes and possibly eggplants. The moisture that inundated the United States east coast with Hurricane Irene and tropical storm Lee and the extraordinarily mild winter have combined to create an unusually comfortable environment for the proliferation of blight spores.
Blight is a fungus transmitted by spores which can lay dormant in soil and be carried by the wind as much as 50 miles in a day. Under ideal conditions spores can germinate in ½ hour. The last great outbreak was in 2009, but 2012 may also be a record year.
For those of you who intend to grow tomato, potato or eggplant plants, you MUST take precautions early even if you are organic gardeners. Landreth suggests that you use copper fungicide, a fungicide approved for organic farming. Use the powder form of copper fungicide. Copper fungicide is sold at most garden centers. Dust the soil where you are going to plant your tomatoes, potatoes and eggplants and till the dust into the soil. On the day you plant your seedlings, dust the seedlings, and repeat this dusting every two weeks, for two more dustings.