Lack of sunlight, poorly draining soil and excessive watering all contribute to root rot. Brown Rot – This is the most serious version. Black root rot is a serious disease caused by Thielaviopsis basicola, a soil-borne fungus that thrives in wet, warm soil that has a temperature between 55 and 65 degrees Fahrenheit. Miller holds a diploma in social services from Clarke College in Belleville, Ontario. Root rot – Both armillaria and phytophthora can cause citrus root rot. Citrus root weevils sometimes attack feeder roots and encourage the progression of decline. The trees show varying symptoms from these different diseases. This splitting often leads to decay and then insect infestation. It causes your tree to decay, dry out, and crumble into pieces. The soil should be completely saturated, but not flooded, and nearly dry before you water it again. Symptoms of black root rot include stunted new leaves and branch die back. You must you cultural practices along with treatment methods, or healing will be short lived. Phytophthora fungi can also cause root rot, along with the usual symptoms. Orange tree image by Evgeny Berdjansky from Fotolia.com. Phytophthora fungi live as spores in the soil, and moist conditions provide an opportunity for it to thrive. Orange trees should be watered every few days during the first couple of weeks after planting. Black root rot is a serious disease caused by Thielaviopsis basicola, a soil-borne fungus that thrives in wet, warm soil that has a temperature between 55 and 65 degrees Fahrenheit. If your tree or shrub is suffering from just Phytophthora root rot and not the other kinds of diseases it causes (collar and crown rot), there is some chance that it can recover.This can happen if conditions become unfavorable to the pathogen, such as becoming warmer … Ensure your orange tree has well-drained soil and cut back on watering to prevent further damage. © Copyright 2020 Hearst Communications, Inc. Potted orange trees absolutely must be put in a container with a hole in the bottom to allow water to drain properly. Above ground, look for wilting of leaves and a thin canopy for the former and yellowing leaves for the latter. If the fruits on your orange tree are splitting, there is not much you can do to fix the problem. Photo by Edward L. Barnard, Florida Department of Agriculture and Consumer Services, Bugwood.org via CC 3.0.Cropped. In each case, look at the roots for signs of rot and disease. 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