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Black Knot

Black knot is visible as soft greenish knots or elongated swellings which form on the twigs and branches. The knots develop into black, corky, cylindrical galls that range from about 1/2 to 1 1/2 inches in diameter and may be more than 12 inches long. Branches beyond the galls are often stunted or dead.

Black knot is caused by a fungus that multiplies during wet spring weather. The visual symptoms are often seen 6 to 12 months after initial infection.

Recommended Control Steps

To control black knot, prune out an destroy infected twigs and branches in the fall and winter. Be sure to cut at least 4 inches below the visible signs of the knot. After each twig branch cut, be sure to sanitize your pruning tool in a mixture of 1 part bleach and 6 parts water as this helps to reduce the spread of the fungus. Large knots or cankers on main branches or the trunk should be cut out to a depth of at least 1/2 inch beyond the infection. In the spring spray the tree with either Captan Fungicide for Fruit & Ornamental Trees or the Fruit Tree, Vegetable & Ornamental Fungicide. Two or three more sprays at intervals of 7 to 10 days are required during the spring season.

Since an affected tree is under immense stress, it is also important to give the tree a good fertilizing. For general tree maintenance, proper fertilization and to improve the overall health of the tree, applying a TreeHelp Annual Care Kit is recommended. These kits contain appropriate fertilizer, mycorrhizal fungi and biostimulant, promoting root development and long-term vitality.

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TreeHelp Annual Care Kit

SKU: TRKIT-ACA BRAND: TreeHelp
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$33.95
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TreeHelp Annual Care KitTreeHelp Annual Care KitTreeHelp Annual Care KitTreeHelp Annual Care KitTreeHelp Annual Care KitTreeHelp Annual Care KitTreeHelp Annual Care Kit

TreeHelp developed easy-to-use Annual Care Kits to help homeowners maintain healthy and vibrant trees.

TreeHelp Annual Care Kits provide health supplements that are specific and appropriate to the type of tree that you care for. The supplements are designed to promote root-development which will have a lasting effect on the long-term health of your trees. Root development is vital for a tree because it gives the tree a reserve of strength and vitality that will help it survive through periods of drought, nutrient deficiency, insect infestation or disease. Too many fertilizers and other soil additives on the market focus on immediate impact - like "candy for trees". Our soil treatments, on the other hand, provide nutrients and organic elements that will help your tree today and for many years to come.

Some of our more popular kits include:

Palm
Contains 5 Complete Fertilizer spikes with high amounts of Manganese, Magnesium and Potassium, crucial to palm tree health.

Citrus
Contains specialized citrus fertilizer spikes loaded with micronutrients to improve tree health and fruit production

Birch
Birch trees are vulnerable to devastating insects such as Bronze Birch Borer. ?ÿThe Birch Kit is designed to promote stronger growth that helps make your tree less susceptible.

Customized kits are also available for over 90 other types of trees.

Having the right composition of minerals and organic material is extremely important in maintaining tree health. As a result, all of our kits are "custom-built" with specially selected components to suit a particular tree type. For example, the mycorrhizal fungi that benefits an oak tree will have no effect on a maple. And the fertilizer recommended for use on a pine would not be ideal for an elm. With our custom care kits, you can be certain you are applying the right treatments to your trees.

Step 1: Mycorrhizal Fungi

Mycorrhizal fungi is a relatively new soil treatment for trees. Co-existing with trees and plants in nature for hundreds of millions of years, these beneficial fungi provide a "safety net" for the tree in times of stress. By colonizing the roots and extending themselves further into the soil, the fungi enable the tree to take in more nutrients and moisture. The result is a healthier, more robust tree better capable of withstanding the many stressful conditions that exist in an urban environment and to better metabolize nutrients.

Because trees are often transplanted into non-native soils, and because urban soils have often been damaged by pollution and compaction, it is essential to re-introduce mycorrhizal fungi to the soil. Our custom care kits match the correct type of mycorrhizal fungi with specific types of trees.

Step 2: Fertilizer

Fertilizer will always be an important component of a comprehensive tree care program. But it must be done properly. Nutrient balances are difficult to achieve and improper fertilization can have drastically poor effects on trees. All too often, trees are fertilized with Nitrogen-rich, quick-release fertilizers. Not only does this have the potential of 'burning' the soil around the roots, it can also promote structurally weak growth that can attract insects and disease. Our fertilizers, on the other hand, slowly release a carefully measured balance of nutrients into the soil for a constant feeding that provides more long-lasting benefit to your tree.

The fertilizers that are included in our custom care kits have been specially selected to provide maximum benefit to a particular type of tree. The formulations are often very different from species to species and target different biological structures. The result will be a healthier, more vital tree.

Step 3: Biostimulant

TreeHelp Bistimulant is a dry, water-soluble green-up powder that is watered on tree roots as a root drench. BioSurge provides benefits to all types of trees, shrubs, and other garden plants. It is designed to increase the microbial activity in the soil around the root zone and encourage root and lateral bud development, improve the efficiency of a plant’s respiratory and photosynthetic systems and delay the aging process in plant tissue. The unique composition of ingredients includes beneficial bacteria, as well as humic acids extracts, soluble sea kelp, yucca plant extracts, amino acids and vitamins.