Indian Hawthorns being evergreen will normally lose some of their older leaves at times but not as much as I believe you have seen. If no spotting of leaves is noticed I'm assuming the leaf damage and dropping is due to the freezing weather. I uploaded a picture of this spotting below for you to see. Let me know if any spotting of leaves is noticed and possibly upload a picture if any is seen. Any spotting or blotches on the leaves could be also other signs of fungal diseases that can cause leaf drop. This is seen as round small red or brown spots on the leaves both on the upper and lower surfaces. This disease is most obvious following periods of frequent rainfall in fall and spring. A common disease of Indian Hawthorn is Entomosporium leaf spot. While looking closely at what leaves may be left inspect them for any odd discoloration or spotting. In spring as new growth appears make sure your plant is well watered, moist not wet, as this will help it recover from winter injury. Make your cuts in healthy or green wood just behind the damaged area. If much of the plant appears to be living you can prune away any branches that are dead after any chance of freezing weather is expected. If it looks brown, dry, and brittle, that area is dead and should be pruned away. If the layer below the bark is green or a moist-looking white it is still living and should sprout new growth in the spring. To determine if a branch is dead, scratch away a small bit of the bark with your fingernail or a knife. Its hard to tell how much damage has occured until spring when hopefully new growth will appear. Their leaves can brown an drop being damaged with this freezing weather. Temperatures below 10 degrees can harm these plants. Hi Joyce-Indian Hawthorn is susceptible to damage due to cold temperatures expecially the freezing winds many have had this winter.
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A nursery professional can also help you with an available fungicide as there are several good products available. Hopefully your Indian Hawthorn shrubs will leaf out again in the spring with little or no damage. Always be safe and read the product information label and use as directed. Before spraying any plant for disease, it is a good idea to always take a sample of the affected leaves to your local quality, professional nursery, not the big box stores, or County Extention Service for a conclusive diagnosis. The fungicide should always be sprayed on both upper and lower sides of the leaves. Using Neem oil and Home made recipes will also help to control fungal diseases. There are several products that contain this chemical such as Bonide Fung-onil and Daconi Ultrex. Spray the affected shrubs with a broad spectrum fungicide such as chlorothalonil. If the shrubs are growing into each other or too close to the house you may want to prune back some again to increase air flow around them.Īny mulch or other plants that are up against the trunks should be pulled away or any mulch that is more than a few inches thick can be reduced so not as much moisture is being held around the plant's base. If shrubs are thick or very dense you can prune or thin out some of the branches in the middle of the plant to increase air circulation throughout the plant. Prune lower branches so there is a 6 to 8 inch space between any foliage and the ground. These leaves may have been infected also and can be blown into other plants spreading the disease. Clean up any leaves that have dropped on the ground.
These affected leaves should be removed and discarded. These spots will darken and get larger with time.
The spotting on the leaves may be brown or a reddish color and may have a yellowish ring around them. There are a few things that should be done to keep the fungal disease from spreading. These shrubs should always be watered at the bottom when at all possible. Plants that are watered from above are also more suseptible as sprinklers may wet them with no chance of drying early in the day. Older plants that have grown dense foliage or have grown together are more suseptible also as there is very little air circulation around the plant to dry any moisture. Plants subjected to periods of moist humid conditions can be affected with fungal diseases. If you see spotting of the leaves on some this is most likely a fungal disease such as Entomosorium which is normally found on species of raphiolepis. You can then prune back any dead limbs or replace the plant if it is dead or doesn't recover to your expectations. As I said you can check to see if the limbs are still green or wait till spring and see what growth may appear. I'm thinking the ones on the hill may have been exposed more so to the harsh cold weather with freezing winds.
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