Blueberry Leaf Rust (BRL) is a fungal disease which affects the leaves of many varieties of blueberries. BRL causes yellowing and wilting of the affected area. It may cause death or damage to some plants if not treated promptly with fungicide.
The most common symptoms are wilted and discolored leaves, followed by loss of fruit production. Leaves turn yellow and eventually fall off completely. Fruit will often drop from the tree before it can be picked.
Some plants may survive, but they will suffer severe damage and die.
Symptoms of BRL include:
Yellowing and/or wilting of leaves, stems, fruits, etc., especially at the tips where infection occurs.
Fruit dropping from the tree before it can be picked.
Leaves falling off completely.
Sooty mold growth on the infected plant. Sooty mold is a fungus that produces white powdery deposits called “soot”. These soot particles accumulate in the tissues of the plant causing them to become dry and shriveled, cracking and rotting.
Drooping of leaves. The whole plant may even droop due to fungal infection.
Blighted and brown spots on the leaves, often with a yellow halo around them.
The fungus that causes this disease overwinters in infected twigs and seeds. It is spread by splashing water or rain. The spores develop in spring, summer, and fall on all above-ground plant parts including dead plant matter.
The most common way to spread the disease is through infected planting material or tools. The fungus can also be spread from plant to plant or tree to tree by raindrops.
Blight is a fungal disease which affects plants and trees, causing them to wilt, become discolored, shrivel up, and eventually die. It is caused by a fungus known as “dieback” which thrives in wet, humid conditions.
The primary symptoms of Blight are wilting and discoloration of the leaves, stems, fruits, etc. Leaf wilting starts at the tip and moves towards the base of the plant. The entire leaf may wilt or just parts of it.
The leaf edges or tips may turn brown or black and the rest of the leaf may appear yellow. Eventually, whole branches may wilt and die. In extreme cases, the whole plant may die.
Sources & references used in this article:
A bacterial leaf spot of highbush blueberry hardwood cuttings caused by Pseudomonas andropogonis. by DY Kobayashi, AW Stretch, PV Oudemans – Plant disease, 1995 – cabdirect.org
Identification and biological characteristics of round leaf spot on blueberry caused by Pestalotiopsis photiniae. by CQ Chen, B Zhang, L Yang, J Gao – Journal of Northeast Forestry …, 2011 – cabdirect.org
Applications of survival analysis in botanical epidemiology by H Scherm, PS Ojiambo – Phytopathology, 2004 – Am Phytopath Society
Disease management in organic rabbiteye blueberries by H Scherm, G Krewer – International journal of fruit science, 2008 – Taylor & Francis
Transcriptome Analysis of Poplar during Leaf Spot Infection with Sphaerulina spp. by AJ Foster, G Pelletier, P Tanguay, A Seguin – PLoS One, 2015 – journals.plos.org
Georgia plant disease loss estimates by A Martinez – The University of Georgia Cooperative Extension …, 2007 – secure.caes.uga.edu