With their shiny , evergreen leave-taking and large , dense growth habit , genus Photinia ( Photinia spp . ) are often used as hedge or screen plants . Garden favorite , ruby-red tip photinia ( Photinia × fraseri ) produce dramatic , bright red newfangled development . Photinias are notoriously susceptible to leaf spot disease , in particular in the southern U.S. , and may also fall prey to common diseases include fire blight and powdery mould . Proper care is vital in prevent disease .
Spotty Situation
Entomosporium leaf spot is a fungous disease that causes modest violent spots on leaves that bit by bit lucubrate to become maroon blotches . Heavily morbid leaves drop off , dampen the shrub . Entomosporium leaf smirch can kill the shrub over several years , particularly if compounded with other problem . To lessen the amount of fungus around the shrub , graze up and destruct dropped leaves and apply a smart , 2 - in layer of mulch . Avoid pruning during the growing time of year , as newfangled growth is particularly vulnerable . Prune in winter , when the bush is dormant .
Mildew Mayhem
Powdery mildew is a fungous disease that causes Mass of fuzzy white or grey spores to shape on plant foliage . The disease can be combated by applying 70 pct neem oil to the entire shrub . Thoroughly mix 2 tablespoons of oil in 1 gallon of pee and go for with a hand sprayer , evenly cake the leaves on the summit and undersides . Shake the sprayer back and forward to keep the table of contents miscellaneous . use every 10 to 14 days until the disease is go . Do not apply when bees are active around the plant . Protect yourself by wear long sleeves , pants and baseball glove , and stack away the oil out of stretch of child and pets .
Blight Blues
A bacterial disease , fervency blight primarily occurs during tender , wet weather condition . The disease causes stagnant while on subdivision , known as canker , that begin to ooze and leave watery stain and streaks . New shoots may also wilt and blacken . Treat canker sore by pruning and destroying infected branches . To avoid spreading the disease to healthy plant material , disinfect your pruning shears by dip them in a solution of 10 percent bleach and 90 per centum water in between cuts .
Cultural Considerations
To forbid diseases , leave your photinia with desirable grow conditions . flushed tip genus Photinia grows in U.S. Department of Agriculture works hardiness zones 7 through 9 , where it will grow in partial to full sunl . Though it can get in full shade , the bush is more susceptible to leaf billet disease in tincture . Plant in a well - debilitate soil that is moist , but not waterlogged or flooded . Thin out the shrub with a light pruning in winter to encourage air circulation , which helps forbid disease .
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