This pathogen favors acidic soil conditions (http://www.ncbi.nlm.nih.gov/pubmed/15077673), therefore any fertilizers that make the substrate more alkaline will suppress the pathogen's virulence and maintain conditions where the plants are more likely to defend themselves. Since many water soluble fertilizers are acidic, they can lower the pH of the substrate and allow fungi like S. sclerotium to thrive. Adding limestone to the soil/substrate can help, otherwise find water soluble fertilizers that contribute to alkalinity.

Hi mr joseph

I have special thanks in advance for your pay attention with me.

 But the most  soil of Iran are alkaline and this disease is saw in alkaline soil.

but the most soil of Iran are clay and i think high humidity is important factor 

You can use Trichoderma throught drip irrigation to control the pathogen

In that case, making raised beds (even higher than normal) may give you the drainage/drying advantage that will help stop the pathogen from spreading. You may also add charcoal or expanded clay beads to provide more air-filled pore space to the clay soil. I do not want to suggest chemical control until everything else is attempted. Best of luck with your research!

Dear ELA

Take attention with following points:

1. Irrigate in the morning so that

plant foliage and the soil surface dry quickly.

Or irrigate with subsurface drip systems so the soil surface is drier.

2. Avoid excessive nitrogen fertilization, which encourages

production of dense foliage,

3. Pottasium level are adequate

4. Deep plowing soils to bury sclerotia below the root zone.

5. Foliar fungicides include triazole, benzimidazole, dicarboximide, and strobilurin products.

 Vegetable Diseases A Colour Handbook, (2007)

Dr  Abou Tabl

I appreciate that.

Sclerotinia survive in soil as sclerotia which are very hardy. Pre-planting soil solarization can reduce the sclerotial bank within a week or two.