The leafspot of Photinia and Indian Hawthorn is in the PDF.

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The best practices for controlling the spread of this destructive disease include recommended fungicides and rates for both commercial and home landscapes.

In the rose family, leaf spot is a widespread and destructive disease.Red tip photinia and Indian hawthorn are damaged by the leaf spot.Other hosts include loquat, flowering and fruiting pear.There is firethorn (Pyracantha sp.).hawthorn, Juneberry, and amelanchier sp.The two plants are Cydonia olonga.

During the spring and fall, the leaf spot damages plants in home landscapes and nurseries.In the winter, there are disease outbreaks on Indian hawthorn.

There are small circular, bright red spots on the upper and lower surfaces of the leaves.There are large purple to maroon blotches on the leaves of photinia.There are bright red blotches on Indian hawthorn.

There are leaf spots that are sunken with ash brown to gray centers and a deep red to maroon margin.The spots on the pear are brown.

The spots on the leaves are large and irregular.There are tiny black specks in the center of each leaf spot.

There are spots on leaf petioles and tender shoots that are similar to those on the leaves.Light infections usually cause little more than cosmetic damage, while severe infections often result in early and heavy leaf drop.Plant sensitivity to environmental and cultural stresses is increased by disease-related defoliation.

There are spots on the leaves, young shoots, and fallen leaves that are important survival sites.From late winter through much of the growing season, the fruiting bodies release a lot of spores.They are spread by a combination of splashing water and wind.Symptoms will appear 10 to 14 days after an illness.

The combination of continuous plant growth, closely spacing plants, and overhead irrigation can cause year-round problems with the leaf spot.Home landscapes have more disease development.

The leaf spots on most hosts are caused by the spring growth flush on the younger leaves.During the summer months, mature leaves are resistant to infections and hot, dry weather slows the spread of disease.During warm, humid weather from late fall through early spring in Alabama, this disease may be active on Indian hawthorn.

Clean plant material can be collected from disease-free stock plants.Plants with no symptoms of the leaf spot can be purchased for a home landscape.New plants should not be near established plants.

The spread of disease can be slowed by spacing plants to improve air movement and speed up the drying out of the foliage.Overhead sprinklers are preferred to watering.Schedule overhead irrigation between 2 and 6 a.m. to reduce the amount of time the foliage is wet.If possible, collect and discard fallen leaves, which are an important source of fungus.

Red tip photinia is the most susceptible with P. serratifolia the least sensitive.The Cracklin Red red tip photinia is partially resistant to this disease.Some of the Indian hawthorns have shown partial resistance to this disease.Pinkie, Harpinger of Spring, Enchantress, Heather, White Enchantress, and Springtime are some of the cultivars of Indian hawthorn.The cultivars are so sensitive to the leaf spot that they may need preventive sprays in the winter to keep their health and beauty.

The leaf spot can be protected with fenicides.There is a complete listing of fungicides labeled for disease control in table 1.

The production of disease-free plants is dependent on whether or not the leaf spot is present.Unless the plants are nearby, routine fungicide applications are not needed on healthy plants.

Every 10 to 14 days from the bud break, apply the fungicides on photinia.During periods of mild, wet weather, pesticide applications may be resumed.The spray program should run from bud break through the first hard frost in late fall in the nursery.In the southernmost counties in Alabama, monthly fungicide applications are suggested if winter weather is warm and wet.

In the late fall or early winter, begin applications for Indian hawthorn.Through the spring, apply once or twice a month.

There is a need to control the leaf spot on partially defoliated plants.The beauty of badly diseased plants should be restored with weekly fungicide applications and severe pruning.Once the plants have produced a healthy leaf canopy, good sanitation and monthly preventive fungicide sprays should keep the disease at bay.

Pesticides should only be used in accordance with the directions on the label.Recommendations for pesticides depend on their registration with the Environmental Protection Agency.Pesticide recommendations are automatically canceled in the event of registration cancellation.Information on registration changes can be found at the county Extension offices.

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