Cherry Bacterial Canker Control Guide for Healthier Fruit Trees and Higher Yields

Bacterial canker is one of most destructive diseases in cherry orchards in numerous fruit-growing areas. Growth scab disease usually results in a sudden loss of a limb's vigor, gum oozing on trunks and a lack of vigor in trees following wet and cool weather. As with cherry bacterial canker, this disease is aggressive and is more likely to occur in stressed orchards, and if untreated, can damage fruit quality, productivity and tree life.

When assessing lesions and gum exudation on trees, many orchard managers ask questions about the cause of the lesions such as: are canker sores caused by bacteria or can bacteria cause canker sores? In fruit crops, for instance, the appearance of cankers caused by bacteria may be similar to that caused by fungi, and may lead to weakness around the wounds and to disturbance of the circulation of food within the crop. Identification of bacterial canker well before its appearance is essential to profitable orchards and tree well-being.

Modern growers are now moving towards integrated and biological practices for increased bacterial canker control and more consistency of use of chemical cherry tree bacterial canker treatment​. In the coming sections, we will discuss how to treat bacterial canker.

Insight into the etiology of bacterial canker of cherry

Pathogenic species of Pseudomonas syringae group are the most frequent cause of bacterial canker. Infected wood, dormant buds, pruning wounds and orchard debris are sources for survival of these bacteria. The bacteria are spread to healthy tissues with the assistance of rain splash and wind during wet weather.

Infection resembles that of cherry bacterial canker in stone fruit orchards due to both disease being associated with cool, moist weather, and both diseases infecting weakened trees. Pathogens enter the injured area or through natural openings and attack the bark tissues, causing interference with the flow of water through the branches.

Generally, bacterial canker life cycle further increases during late fall, winter and early spring with high moisture levels. Nutrient deficient trees, trees exposed to frosts, poorly drained trees and over-pruned trees tend to be more susceptible to infection.

A grower's knowledge of disease pressure at an early stage will aid in better directing orchard activities in order to minimize losses in the future.

Recognizing Bacterial Canker Symptoms in the Orchard

It is important to identify the symptoms of bacterial canker early as symptoms may be observed inside the plant prior to any external damage is detected. Dark, sunken lesions in branches, twigs and trunks are among the first signs and symptoms.

With later stages of infection, an excessive quantity of amber-colored gum may be secreted, twigs can snap off at the point of infection and starting from the tips branches may die. Fully one scaffold limb may deteriorate quickly, particularly with severe cases.

These symptoms are often mistaken as due to environmental stress or pruning damage when they first appear. Infection with bacteria, however, causes easily recognized cankers which are associated with gummy exudates and cracked bark. Disease patterns of peach bacterial canker outbreaks are similar in the stone fruit orchards.

This continuous monitoring enables orchard managers to detect infections before extensive damage comes to the canopies, during the periods of wet weather.

How the Bacterial Canker Life Cycle Spreads in Orchards?

How to treat bacterial canker? Bacterial canker life cycle starts with the presence of bacteria in the infected plant tissues through dormant season. Bacterial dispersal between trees can occur due to rainfall, irrigation splashed water, tools used for pruning, insects, and strong winds.

Bacteria grow quickly in the cool, wet environments, and enter through pruning wounds, frost cracks, leaf scars and natural openings of the wood that are exposed. Youth is the age at which the bark tissues are more tender and susceptible of penetration, making young trees very susceptible.

Disease is exacerbated by stress conditions including over irrigation, nutrient deficiency and imbalance, compacted soil and winter injury. Long-term programs for the control of bacterial canker ought to include orchard sanitation and preventive care for that reason.

Knowledge of disease movement pattern support growers to decide on the right orchard management decisions and practices in terms of orchard hygiene, orchard pruning and biological disease management practices.

Traditional Bacterial Canker Control Methods and Their Limitations

Traditional chemical programs and copper sprays heavily relied on for many years to control bacterial canker. The results of these cherry tree bacterial canker treatment​ are occasionally beneficial in the short, not in the long-term, when disease pressure is high.

Overlap of chemical applications may cause phytotoxicity issues, particularly sensitive growth periods. Further, with the increased use of chemicals, orchard managers are starting to worry about the possible development of chemistry resistance and environmental impact.

Soil cherry tree bacterial canker treatment​, pruning management, stress reduction and biological disease suppression are key components of integrated disease management practices many growers are now using to cure bacterial canker problems in fruit trees. Appropriate pruning time, too little nitrogen fertilization, increased flow and reduced tree stress are all factors of reducing the disease severity.

Use of Bacillus velezensis for Management of Biological Diseases

Biological solutions have become more commonplace to control bacterial canker in orchard production systems today. A beneficial fungus that can suppress the detrimental pathogens and make plant more resilient is also one of the most useful microorganism which is used in biological disease management, namely Bacillus velezensis.

Bacillus velezensis is unlike most traditional chemicals because it colonizes the surface of plants and asserts itself against disease-causing organisms in an aggressive manner. Also aids better root activity and stress resistance plant defense responses.

Nowadays, many cherry tree canker growers are considering the integration of BMS (biological microbial solutions) in their orchard production systems as an alternative to safer treatment of bacterial canker. Biological methods not only help control disease, but can also help create a more sustainable orchard and achieve a balance of microorganisms.

A Biological Solution for Orchard Protection

Bactonus has proven to be a valuable biological aid to orchardists seeking sustainable strategies for controlling cherry tree bacterial canker and to enhance disease management. The product contains highly effective strains of Bacillus velezensis which facilitate the natural competition between microorganisms and disease complexes on surfaces of plants.

Bactonus can be used preventatively, strengthening defence system of plants and enhancing leaf/bark defence when disease conditions are favourable. In most orchards, biological applications are used to aid in the efforts of the biological control program.

Bio-products are more effective than chemical sprays repeated applications at maintaining beneficial microorganisms and overall healthy orchard ecosystem. This is gaining greater importance to the grower that is interested in lower chemical use and maximizing the output over an extended period of time.

Biological treatments are also gaining popularity among gardeners who seek less-toxic solutions to issues concerning the sustainable use of the environment. Bactonus is a biological bactericide that is used to help in the control of bacterial plant diseases naturally.

The beneficial microbes found in Bactonus includes the Bacillus velezensis useful in inhibiting the harmful microbes that cause diseases such as bacterial canker on the cherry trees. These useful microorganisms complement the pathogens and generate natural products which suppress the growth of the bacteria.

Biological remedies will enhance cherry bacterial canker control efforts when added with adequate pruning, sanitation, and tree care measures. Natural microbial products combined with preventive gardening activities make the ecosystem much more balanced as this enables bacteria to treat bacterial canker long-term and assist the gardeners to control how to treat bacterial canker on cherry trees​.

How to treat bacterial canker Successfully?

Other protection measures such as balanced nutrition programs, appropriate canopy air flow and preventative microbial applications compound the trees overall resiliency to infection. Some orchardists are achieving longer-term success with their efforts to know how to cure bacterial canker on fruit tree with the use of natural products Bactonus and sanitation practices.

Integrated biological systems continue to be an evolving management tool, and may be one of the more practical methods for chronic bacterial canker control and improving cherry production.

Reference:

• Kim, Seulbi, et al. "Biological control of the shot-hole disease in flowering cherry tree using antimicrobial compounds produced by Bacillus velezensis 8–2." Chemical and Biological Technologies in Agriculture 11.1 (2024): 87.
• Han, Viet-Cuong, et al. "Identification, characterization, and efficacy evaluation of Bacillus velezensis for shot-hole disease biocontrol in flowering cherry." The plant pathology journal 38.2 (2022): 115.