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Today at the Nature Company we discuss Orchid leaf problems. Professional Tips on solving your Orchids leaf spot problems , Orchid diseases and fungus. We show you how to identify the fungus that is attacking your Orchid. and look at the ways to treat and prevent these orchid leaf problems. Symptoms of Black Rot. Symptoms: The infections usually starts on the leaves, new leads or roots, though all plant parts are susceptible. The disease spreads rapidly and will kill the plant unless treated promptly. Leaf symptoms first appear on the underside as small, irregular, watery, brown spots which rapidly become purplish brown or purplish black. The spots may have a yellowish advancing margin. The lesions enlarge with age and may ooze water if pressed. Old lesions sometimes become dry and black, often allowing other diseases to attack the plant. The disease may spread rapidly to the rhizome and roots, particularly when the temperature and humidity levels are high. Symptoms of Fusarium. Symptoms: Fusarium blocks the flow of moisture through the plant’s vascular system plugging the phloem. Infected leaves are yellow, thin, shriveled, wrinkled or wilted and eventually die. The diagnostic symptom in the plant is a circle or band of purple or pinkish-purple discoloration on the outer layers of the rhizome evident when the rhizome is cut. If the disease is extensive, the entire rhizome may turn purple, and the discoloration may extend to the pseudobulbs. The pathogen is spread through improper hygiene, generally as a result of using nonsterile cutting tools, which transfers the fungus from plant to plant. Severely infected plants may die in 3-9 weeks, while mildly infected plants gradually decline over a year or so. Symptoms of Guignardia Leaf Spot. Symptoms: The first signs of Guignardia infection are tiny, dark purple, elongate lesions on either leaf surface. These lesions run parallel to the veins and elongate into purple streaks or diamond shaped areas. Spots often merge to form large irregular lesions that may affect a large part of the leaf. With age, the center of the lesion turns tan. Raised, black sporing bodies develop in the affected area. Affects mostly Ascocentrum and Vandas and their hybrids and may indicate insufficient light. This blight is also known as Phyllosticta; the names apply to two different sexual stages of the same fungus . Symptoms of Phyllosticta Leaf Spot Symptoms: Spotting from Phyllosticta may start anywhere on the leaf or pseudobulb. The lesions are tiny, yellow and slightly sunken. As they enlarge, they become round to oval and more sunken, especially if the infection is on the leaves. With age, they turn tan to dark brown and develop a slightly raised, red to purple black margin. Eventually, tiny black, raised spore structures develop in the center of the spots. Individual spots are about ¼ in across. Severely infected leaves may drop prematurely. Its presence may indicate insufficient light. This blight is also known as Guignardia; the names apply to two different sexual stages of the same fungus. Symptoms of Cercospora Leaf Spot Symptoms: Infection shows first as a yellow spot on the underside of the leaf. Soon after infection occurs, the yellow green area may be noted on the top surface of the leaf. The spots continue to enlarge in a circular or irregular pattern and may eventually cover the entire leaf. With age, the spots become slightly sunken and necrotic and change to purple-brown or purple-black. The advancing margin remains yellow. Heavily infected leaves usually fall from the plant prematurely, especially in the infection started near the base of the leaf. As the spots enlarge in irregular patterns, they become sunken and turn purplish brown to purplish black. The top surface of the leaf first becomes chlorotic and finally necrotic. Please subscribe and follow us on Facebook@thenaturecompany #orchid #orchidcare #thenaturecompany List Of Fungicides Support Channel Use The Affiliate Link Below Amazon Store link or Buy me Coffee ; Amazon Affiliate Link for Orchid related Products Subscribe To Our Travel and Personal Channel @edandpeter
