Application

Spray tea tree fungicides on infected plants every three days to once each week to control mildews and other fungal infections. Spray in the morning, before the sun is high. Midday sunlight can cause oil-treated leaves to burn. Use the solution sparingly and avoid soaking the foliage with spray. Target only the problem areas. Do not use fungicides on new plants or transplanted seedlings. If leaves begin to wilt, reduce the amount of soap in your spray or dilute it with water. During periods of warm, dry weather, do not apply fungicide for plants, even if they are made from natural products, more than once each week.

Preventing Fungal Infections

Prevent reinfection or spreading the fungus to other plants by removing all infected material from your garden. Clean away fallen plant debris and prune diseased areas from your plants. Place these in a garbage bag or burn them. Do not compost diseased plant material. Some fungi spores can remain viable in the compost and will infect plants when applied to the soil. Water your plants regularly, but avoid overwatering. Most fungi prefer wet environments. Rich soil with enough nutrients to feed all of your plants also ensures a more vigorous garden. Healthy plants are better able to ward off fungal spores and survive infection.