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Black rot on orchids is caused by Pythium and Phytophthora species. [1] Black rot targets a variety of orchids but Cattleya orchids are especially susceptible. [1] Pythium ultimum and Phytophthora cactorum are known to cause black rot in orchids. [1] Pythium ultimum is a pathogen that causes damping-off and root rot on plants. [2]
Crepe myrtles are for the most part trouble-free. But insects, cool nights, and too much shade can cause problems. If your tree didn't bloom or you've spotted mold, here's what you can do.
It is one of the most common viruses affecting cultivated orchids, perhaps second only to the Cymbidium mosaic virus. [1] It causes spots on leaves and colored streaks on flowers. [ 1 ] If a plant is also infected with the Cymbidium mosaic virus , it can lead to a condition called blossom brown necrotic streak.
Getty Images / Joe_Potato ... it's best to resist the urge to cut back a crepe myrtle in the fall as soon as the leaves have fallen. Because crepe myrtles bloom on new growth and don't begin ...
Sooty mold is commonly seen on the leaves of ornamental plants such as azaleas, gardenias, camellias, crepe myrtles, Mangifera and laurels. Karuka is affected by sooty mold caused by Meliola juttingii. [6] Plants located under pecan or hickory trees are particularly susceptible to sooty mold, because honeydew-secreting insects often inhabit ...
Given several weeks, a black sooty mold fungus will develop in the honeydew substrate. Outbreaks of crape myrtle bark scale are being seen across the Metroplex. To get rid of the sooty mold we ...
The crape myrtle is a fast growing tree that can be affected by mildew and aphids.
The black spots can become about 5 millimeters in diameter. [1] As the season continues, the tissue around the original spot may become necrotic. [4] In severe cases of the disease there is premature shedding of leaves, blight of young leaves and shoots, and complete defoliation early in the fall. [1] Fruits that are infected become crumpled. [1]