The most common method of treating leaf curl is to spray sulfur or copper after leaf drop in the fall and again in the spring.
Leaf curl starts appearing in early spring on stone fruit trees. Spray a mixture of apple cider vinegar and water in winter and early spring when buds appear, then every couple of weeks. This will help with brown rot, black spot and leaf curl, to name a few.
Yes, once it starts, the problem is likely to happen every year but it's not worth getting worried about. Simply do as instructed - pick off and pick up all disease leaves, bin (never compost them) them, feed and water the tree well soon as you see it happen, and the tree will recover beautifully.
Leaf curl disease shows up in spring, does the damage, and then disappears (until next spring). If your trees were infected last spring, they should have completely recovered by mid to late summer. They usually grow lots of healthy new leaves (like the photo below).
fungicide in fall. To control Peach Leaf Curl, treat Peach and Nectarine trees with a fungicide in the fall after leaves have dropped. In the past, the disease could be successfully treated with either lime-sulfur fungicide or a fixed copper fungicide with a copper compound containing at least 50 percent copper.
Organic Control Methods for Leaf Curl
Spray at bud-swell with copper hydroxide or copper oxychloride and ensure thorough coverage over all branches. Timing is critical to prevent the fungus entering the plant when new leaves are vulnerable.
Leaf curl can usually be controlled satisfactorily by a spray of a suitable registered fungicide at any stage of dormancy. Most effective control is achieved by spraying when the buds are swelling but before they have opened. It's not possible to control the fungus once it's entered the leaf.
Prevent Leaf Curling
Another sign of magnesium deficiency, this problem can also be tackled with the help of Epsom Salt. Mix two table spoons in a gallon of water and spray your curled foliage with the solution until the leaves look perfect again.
Use ACV for fertilising your plants
Simply mix water with your apple cider vinegar and pour it into a sprayer or watering can. Spray this solution at the base of the plant, avoiding watering the leaves as this can often lead to wilting.
The safest, effective fungicides available for backyard trees are copper soap (copper octanoate) or copper ammonium, a fixed copper fungicide.
Leaf Curl, prevention is the only way to deal with it that I know of. I start spraying my trees with Neem oil / Bonide Copper Fungicide mixture when dormant 3 times last spray when the buds start swelling but are still gray colored. Blossom Blight is a problem too, this spray takes care of that too.
Over-watering.
Overdoing your watering can have a similar effect to underwatering. You may also find your plants produce an excess of foliage but few tomatoes. Leaves might yellow and wither, or they could curl.
Curl cream:2 table spoons of butter,2 table spoons of beeswax,2 table spoons of cocunat oil,1 table spoon of aloe vera gel and one table spoon of almond oil and olive oil. (I refrigerate it for 10 minutes and then used it again blended all the products together).
Sugar spray essentially accomplishes the same styling goal as salt spray. The seemingly tiny swap from salt to sugar makes all of the difference in the world. Just like salty ocean water, salt spray is great at creating texture in part because it's slightly drying.
Best Treatment for Leaf Curl
Where Leaf Curl has been severe in the previous year, trees can also be sprayed with Yates Liquid Copper Fungicide in autumn when the leaves drop, plus at the first sign of bud swell and again one week later.
Plants often recover on their own from leaf curl caused by transplant shock within a couple of weeks.
Pour 2 cups of vegetable oil and ½ cup of dishwashing liquid into a jar, mix it well then add 1 tbsp of concentrate to 1 litre of water. Spray to cover the top and bottom of the foliage.
Nutrient deficiency: Citrus trees need a balanced diet too! Lack of essential nutrients, especially zinc and magnesium, can result in leaf curl. Overwatering or underwatering: Finding the right balance is key. Both overwatering and underwatering can cause stress to your citrus tree, leading to leaf curl.
It is recommended to treat the trees just after most of leaves have fallen, usually late November or December.
Low Humidity
Many common houseplants require high humidity to thrive. Dry indoor air can starve them of this humidity, causing the leaf edges to curl or brown. Boost humidity levels by misting your plants regularly or using a humidifier.