Question
I have an 8x8 raised bed which I've neglected for the past couple of years. I'd like to take the proper steps to prepare for next year. I have a plan for adding amendments to the soil after turning it but first I need to dispose of some of the diseased plants. I know that some diseases/fungi can overwinter but is that only if the diseased plant is left in the garden throughout the winter? I thought I'd remembered reading somewhere that spores can settle on the soil that can overwinter even after the plant has been removed. Is this the case? If so, is there an organic fungicide or some other step I can take to prevent them from overwintering? It is seemingly too late in the season to utilize a method in which I could capatalize on the heat of the sun. I live in SouthWestern PA. Thank you!!!

Answer
Christy, even though it is late in the season, the best alternative is to spray the area with a copper or sulfur fungicide, and then cover the entire area with 3 mil black plastic for the winter. We will still get enough sun over the next 2-3 months to solarize the soil. The combination of the fungicide and solarization of the soil will kill the spores.

Otherwise, you are planning all the right things by amending the soil in the spring with organic matter and disposing of the dead plants. By adding compost and other organic materials, you will improve the nutrient levels of the soil, balance the Ph levels, and attract earthworms and other beneficial insects next year that should result in a healthy and bountiful garden.

Good luck ,and have a great weekend.

Regards,

Mike