Potato Scab Control for Commercial Growers: Best Practices & Strategies

Potato scab is a soil-borne bacterial disease which causes Streptomyces scabies to affect potato quality and make them unsuitable for market sales. The commercial production of potatoes became difficult after a scab outbreak developed rough lesions on tubers that diminished their market worth while decreasing consumer interest. Hence potato scab control became important. In this article below, we will discuss what causes potato scab and how to prevent potato scab organically.

What causes potato scab?

Streptomyces scabies acts as the bacterial cause of potato scab by existing in the soil. The bacterium Streptomyces scabies thrives best in light alkaline soils (pH 5.5 upward) when the soil is dry and contains ample organic materials. The bacterium Streptomyces scabies penetrates potato tubers through their natural entry points or skin wounds to cause characteristic corky and rough lesions. The internal quality of potatoes remains unaffected by scab but its exterior appearance becomes unappealing which makes them undesirable for commercial and eating purposes. Tubers develop scab more easily when dry weather coincides with their formation period while improper crop rotation further enhances the outbreak potential.

Field Observations: Recognizing the Problem

During the middle of my potato harvest period, I observed tough and corky marks covering several of the tubers from above as common scab potato diseases. The common scab of potato symptoms included the skin discolorations resulting from trivial dirt scratches. The scab lesions grew more severe while the season continued which resulted in the disease infecting many of my potatoes.

The potato scab disease cycle includes the establishment first requiring Streptomyces scabies bacteria to survive in soil areas or infected plant remnants. Soil can maintain Streptomyces scabies bacteria during long periods when there is no potato cultivation. Bacteria start their growth cycle within potato-covered soil which has dry conditions and a slightly alkaline pH level higher than 5.5. Through skin openings such as lenticels and tiny skin wounds the potato tubers become infected by these bacteria. The bacteria establish a presence within the plant tissue which results in the formation of typical rough corky scars known as scabs. The bacteria that cause potato scabs survive in the soil during fallow seasons and infected tubers left behind to initiate future infections of new potato crop plantings.

Diagnosis: Identifying Potato Scab

After checking for the potato scab disease cycle, I checked the soil tests along with agricultural extension services and confirmed that common scab control in potatoes infected my crop as the main problem. The disease develops best in alkaline soils and grows stronger under dry circumstances that occur during the tuber development period. Scientists established Streptomyces scabies as the pathogen responsible for the infection and potato scab control.

Initial Control Measures: Traditional Practices and Their Limitations

I used various standard potato scab treatment techniques when trying to control this epidemic. Soil pH Adjustment started as the initial control step I implemented for common scab of potato treatment. My goal was to reduce the soil pH by adding sulfur since acidic conditions would make the environment unfavorable for the bacterial growth for potato scab disease cycle. I provided regular watering procedures during the tuber formation stage since constant moisture helps prevent scab from forming. The disease cycle was disrupted by growing oats and barley between potato crops. The scab proved difficult to overcome through these conventional methods because the treatment was not adequate.

Community Insights: Shared Experiences and Challenges

The research conducted through forums demonstrated that potato growers experienced comparable problems. Reddit users discussed both potato scab problems along with issues regarding the conditions of the soil and what causes potato scab. According to a user report potatoes thrive best in slightly acidic conditions so one must check soil pH levels to minimize scab risks for potato scab control​. Users stressed that proper drying of potatoes following cleaning becomes essential when scab exists because this practice of common scab control in potatoes blocks mold formation in storage. Various discussions showed that various producers were dealing with the extensive issue and required efficient solutions to address it.

How to Prevent Potato Scab organically with HarzShield Trichoderma Bio-Fungicide from Novobac

I chose HarzShield for common scab of potato treatment as the most suitable bio-fungicide after conducting thorough research and consultation because it contains Trichoderma harzianum strain T-22 from Novobac. Organisms within this biological potato scab control agent demonstrate two major capabilities which benefit soil health and protect plants from pathogens. I made the decision to use HarzShield in my cultivation procedures.

Implementation and Results: A Successful Turnaround

I experienced plant health enhancement together with scab reduction when I introduced HarzShield as a common scab control in potato treatment into the soil preparation process and the planting stage. The bio-fungal solution for common scab control in potatoes took residence in the root area which then dominated over damaging microorganisms and helped the plants obtain better access to nutrients and helped me in my potato scab treatment​. The quality of my potato harvest improved tremendously because my crops developed few scab lesions that made them ready for market.

Integrating Biological Practices with Cultural Practices

The success allowed me to create a multisystem management plan with several components for common scab of potato treatment. Targeting soil testing as a main procedure stands as the most important factor. Optimal planting environment results from checking pH value and nutrient content. Consistent Irrigation made things better for potato scab control. The provision of proper water amounts during crucial development phases works towards preventing scab infections. Crop Rotation is primary. The strategy continues to use rotations between non-host crops in order to break the pathogen reproductive cycle. Such an integrated method proved successful in managing potato scab while simultaneously enhancing both soil conditions and plant durability.

Conclusion: Embracing Sustainable Solutions

Our fight against enduring potato scab led us to recognize the crucial need for implementing sustainable disease potato scab control methods that result in market-quality produce. In the above article, we found out what causes potato scab and how to prevent potato scab organically. This transformation was made possible by the dependable and eco-friendly nature of HarzShield which Novobac produced. Growers who deal with similar challenges should implement HarzShield alongside proper cultural practices for successful sustainable crop production.

Reference: 

• Wang, Zhenshuo, et al. "A rhizosphere-derived consortium of Bacillus subtilis and Trichoderma harzianum suppresses common scab of potato and increases yield." Computational and structural biotechnology journal 17 (2019): 645-653.
• Al-Askar, A. A., et al. "Trichoderma harzianum WKY5 and its Gibberellic Acid Control of Rhizoctonia solani, Improve Sprouting, Growth and Productivity of Potato." Egyptian Journal of Biological Pest Control 26.4 (2016).