Tuber Soft Rot Control

Tuber soft rot, a significant challenge in tuberous crop cultivation, often arises from soil-borne pathogens.

To effectively address this, PRIMA Agro Tech has innovated a multi-strain microbial solution, incorporating Pseudomonas fluorescens, Bacillus velezensis, Streptomyces thermovulgaris, and Trichoderma harzianum. These strains combat the pathogens causing soft rot while stimulating tuber growth. This curbs the disease and promotes healthier, more productive crops, showcasing a commitment to sustainable and efficient agricultural practices.

About the Plant Disease

Tuber soft rot control and tuber growth stimulation are crucial in managing the health and productivity of tuberous crops. The soil, while being a primary source of nutrients and a growing medium for plants, also harbours various pathogens that can cause diseases in tubers.

Pathogen(s)

Several specific pathogens are known to cause tuber soft rot in various crops, particularly in tuberous plants like potatoes. These soil-borne pathogens typically enter the plant through wounds or natural openings and thrive under certain environmental conditions. The most common pathogens associated with tuber soft rot include:

Erwinia carotovora subsp. carotovora is a well-known cause of soft rot in potatoes and other tuberous and root crops. It produces enzymes that degrade the plant cell walls, leading to the rot’s characteristic soft, mushy texture.
Like Erwinia carotovora, Erwinia chrysanthemi (Dickeya chrysanthemi / Pectobacterium chrysanthemi) also causes soft rot in various plants, including tubers. It is particularly problematic in warmer climates.
Fusarium species, particularly Fusarium solani and Fusarium oxysporum, are fungi that can cause tuber rot. They are also responsible for various other plant diseases, including wilt and root rot.
Rhizoctonia solani fungal pathogen is known for causing black scurf on tubers, but it can also contribute to soft rot, especially when the tubers are weakened or damaged.
Sclerotinia sclerotiorum causes a disease known as white mould or sclerotinia rot, which can lead to soft rot in a wide range of plants, including tubers.
Phytophthora species, while often associated with late blight in potatoes, can also cause soft rot-like symptoms in tubers, especially under wet conditions.

Effective management of these pathogens involves a combination of cultural practices, such as crop rotation, proper irrigation management, and the use of resistant varieties, biological control methods and, in some cases, chemical treatments. Understanding the specific pathogens and their life cycles is crucial for developing targeted and effective control strategies.

Symptoms & Damage

The primary symptom of tuber soft rot is the appearance of wet, rotting areas on the tubers. These affected parts easily decay and secrete fluid when injured. This disease reduces the quality and marketability of the tubers and can significantly diminish the yield, as the infected tubers often become inedible or unusable.

Microbial Consortium

PRIMA Agro Tech has developed a multifaceted approach to address tuber soft rot and stimulate tuber growth, utilizing a combination of beneficial microorganisms. Together, these microbial agents provide a comprehensive solution for managing tuber soft rot and enhancing tuber growth, aligning with sustainable agricultural practices and improving overall crop yield and quality.

Pseudomonas fluorescens strain YL-SS3: This bacterium effectively suppresses soil-borne pathogens that cause tuber soft rot. It produces antifungal compounds and enhances the soil microbiome, creating an environment less conducive to pathogen proliferation.

Bacillus velezensis strain NRRL B-41580: Known for its plant growth-promoting properties, this strain also exhibits strong antifungal activities. It helps fortify the plant’s natural defence mechanisms, making the tubers more resilient to pathogenic attacks.

Streptomyces thermovulgaris strain 09924-c8Ka-50-3: This strain offers robust antifungal capabilities, significantly contributing to controlling tuber soft rot pathogens.

Trichoderma harzianum strain CBS101525: A renowned biocontrol agent, this strain promotes plant growth and health. It competes with harmful pathogens for space and nutrients, reducing their impact on tubers.

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