With a few DIY techniques
Keep your garden clean. Pick up plant debris, remove dying stems or branches, weed the area regularly, and toss the debris in the garbage.
Fertilize just enough to keep your plants happy – too much fertilizer promotes weak growth which is susceptible to disease.
Wait to plant until the soil is warmed up. Planting to early will put extra stress on your plants and make them more susceptible to disease in the soil.
Use mulch to keep weeds at bay and harmful fungi in the soil away.
Inspect and remove infected stems and leaves. As soon as you notice signs of disease, carefully remove the leaf o stems and throw it away as soon as possible. By removing disease early on, you can help your plants to continue to grow healthily.