As with many fungal diseases, one of the best strategies is prevention. Fertilise regularly and water well, but ensure your tree is never sitting in water or is overly damp. Read more about how to prevent this disease and ways to treat it. Gummosis of apricots results from prior damage or injury to trees within the orchard. Directly after pruning infected trees, all tools used should be … The leaves are ovate and has a finely serrated margin, the flowers are white or pink, and the fruit is a fleshy yellow-orange drupe. In many cases, a gum-like residue begins to be produced. Though the name may imply its presence solely in apricot trees, other trees (such as peach trees) may also be affected. Among the first signs of apricot fungal gummosis is the presence of “blister-like” lesions on branches and portions on the trunk of the tree. The wound can be from splitting during a rapid growth phase, physical damage from whipper snipper, mower or other accidental damage, or from boring type of insects. As mentioned, citrus trees with Rio Grande gummosis form blisters on the bark of trunks and branches. Then they are spread during periods of wet and humid weather. Aliette). Fungal spores continue to grow and reproduce. This will prevent your tree from producing growth that could be damaged by cold in the fall. and 12% of large wounds Growers should never prune trees when the plants are wet. When pruning you should always disinfect your secateurs frequently during the process. If there is, then you have a boring insect causing the damage. These delicious fruit crops, which include apricots, peaches, and nectarines, are grown for fresh eating, canning, and even dehydrating. Apricots are prolific early bearers and a heavy load of fruit on young sappy branches can lead to splitting, especially in the branch crutches. Avoid planting apricot trees near any other tree with canker. Significantly less infection takes place when trees are pruned immediately after spore dispersal declines (early winter) than when trees are pruned in autumn or spring, but nevertheless 3% of small wounds (< 1.3 cm. Splitting allows the bacteria an entry point – and is to be avoided whenever possible. While damage caused by apricot gummosis can be reduced by the use of fungicides, this practice is generally not recommended, as it is not cost effective. It usually happens for one of these reasons: If so, it may be infected with the fungus Leucostoma that causes apricot gummosis and cankers. While the disease will still progress in plants which have been well cared for, trees will be less susceptible to other possible pathogens or insects which may attack weakened plants. Apricot trees blossom with white and pink flowers in the spring, which give way to tasty fruit. You can thin the fruit, cut the branches shorter, prop up the branches or tie up the branches with broad soft ties. This disease has become almost endemic in apricot trees across Melbourne. If crown damage is less than 25 % of the circumference, you have a chance of saving the tree: If viable foliage remains on the tree, treat foliarly with a systemic fungicide (e.g. What are the symptoms of Rio Grande gummosis of citrus? Only prune when the weather is dry. How to Treat Fruit Tree Borers. Trees are at their most susceptible as they are coming out of dormancy – do not prune over this time. Make sure it has good drainage and optimal pH. A small spray bottle of methylated spirits will do the job. The fungus enters the tree through these injuries. If you want to know how to treat gummosis, remove the darkened area of bark from the tree, plus a strip of the healthy bark until the wound is surrounded by a margin of healthy bark. Carroll E. Younce, USDA Agricultural Research Service,, What Is Gummosis: Tips On Gummosis Prevention And Treatment, Peach Gummosis Fungus Info – Treating Peaches With Fungal Gummosis, Rio Grande Gummosis Info: Learn About Citrus Rio Grande Gummosis Disease, Prickly Kale Leaves – Does Kale Have Thorns, Corn Husk Wreath Ideas: How To Make A Corn Husk Wreath, DIY Air Plant Wreaths: Wreath Making With Air Plants, How To Transplant Bergenia: Dividing And Moving Bergenia Plants, Bugs In The Garden: The Most Common Garden Pests To Look Out For, Indigo Plant Varieties: Learn About Different Indigo Plants, Everblooming Gardenias: Growing A Grafted Everblooming Gardenia, Thanksgiving Tradition: Turning Homegrown Pumpkins Into Pie, Growing Thanksgiving Dinner – Must Have Turkey Side Dishes, Interesting Uses For Pecans: What To Do With Pecans, The Bountiful Garden: Bringing The Garden To Thanksgiving. Plant trees in well-drained soil as the canker thrives in moisture. You should consider fertilizing with nitrogen in the late winter or early spring. Prevention and Treatment There are management practices you can follow to lower the risk of gummosis: Be careful when using lawn and garden equipment to avoid tree tissue injury, which can harbor fungal spores. I noticed my apricot tree, despite bearing a good crop last year, had hardened globules of amber-like sap on various branches, with some die-back.. Sign up for our newsletter. You should always prune apricots in the warmer months (NOT in winter). Since the primary causal agent of apricot, peach, and plum gummosis attacks weakened trees, do your best to keep yours healthy with optimal mulching, watering, and nutrition. Gummosis is a bacterial infection, so while spraying with a fungicide might make you feel proactive, but it is unlikely to solve your problem. The use of proper pruning techniques is essential. Is a small size tree, with a large and dense crown. This fungus only infects stressed trees and enters through wounds, so you may be able to avoid it entirely. Facts on Fungus of an Apricot Tree. Citrus Rio Grande gummosis is a fungal disease caused in part by the pathogen Diplodia natalensis along with several other fungi. Additionally, cut branches and plant debris should be removed immediately. Sign up to get all the latest gardening tips! While uncommon in the home orchard, large scale operations may inadvertently cause damage during the harvest process or by various farm machinery. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Directly after pruning infected trees, all tools used should be sanitized before using them elsewhere in the orchard.

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