The curled leaves on your dwarf peach trees maybe a fungal disease called peach leaf curl. These are some organic methods you can try to keep your trees healthy:
Regularly inspect your trees for signs of pests or diseases. Early detection and intervention are key for organic pest control.
Apply dormant sprays with copper fungicide before buds begin to swell in early spring to prevent spores from germinating.
Prune branches to allow for better air flow within the tree to reduce moisture that can harbor fungal diseases.
Rake and remove fallen leaves to eliminate places where fungal spores can overwinter.
Ensure your dwarf peach trees have good drainage (they prefer slightly sandy soil).
Apply a 2inch layer of organic mulch like leaf mold or compost around the base (but not touching the trunk) to retain moisture, suppress weeds, and promote beneficial soil microbes.
Fertilize in late winter/early spring with a balanced organic fertilizer following package instructions. Every 3 years, add an organic source of potassium like greensand or kelp meal to aid fruit development.
Encourage ladybug populations as they are natural predators of aphids and other small insects.
Use neem oil spray to control various insects like aphids, mites, and scales. Be sure to follow application instructions carefully and avoid using it during hot weather or when pollinators are active.
When fruits are small, thin them to one peach every 6-8 inches. This allows better air circulation and prevents branches from breaking under the weight of too much fruit.
Consistency is key with organic gardening, so be patient and persistent with these recommendations.