LetgenPro|Multiplex Real Time PCR Kit 100 rxn (Fusarium spp/Phytophthora spp./Rhizoctonia solani)

Soil-borne diseases represent one of the most complex challenges in agricultural production, often occurring as a root rot complex in which multiple pathogens simultaneously infect root and vascular tissues. The Letgen Biotech Multiplex RT-qPCR assay is designed for the simultaneous detection and differentiation of three major soil-borne pathogens: Fusarium spp., Phytophthora spp., and Rhizoctonia solani. 

The epidemiology of this disease complex is driven by diverse environmental triggers and soil dynamics. Phytophthora spp. (oomycete pathogens) thrive in water-saturated soils, utilizing motile zoospores to spread rapidly through drainage and irrigation water. Conversely, Fusarium spp. and Rhizoctonia solani are true soil-borne fungi capable of long-term survival in soil through resilient structures such as chlamydospores and sclerotia, becoming highly aggressive under fluctuating temperature and moisture conditions. 

Fusarium spp.colonize the plant vascular system, obstructing xylem vessels and disrupting water transport. This leads to progressive chlorosis and wilting, typically advancing upward as the pathogen compromises the plant’s systemic vascular integrity. 

Phytophthora spp. are primary causal agents of root and crown rot. Their rapid dispersal often results in sudden plant collapse, especially in poorly drained areas where water molds can spread epidemically across entire fields. 

Rhizoctonia solani is responsible for damping-off and root decay, particularly during early growth stages. It targets tissues at the soil line, creating necrotic lesions that constrict the stem, physically weakening the plant and leading to severe stand losses. 

Because these pathogens frequently produce overlapping symptoms—such as stunting and root decay—visual diagnosis alone is often unreliable. Moreover, their distinct biological classes and survival strategies require different management approaches. The Multiplex assay enables the detection of pathogen-specific DNA in a single reaction, supporting accurate differential diagnosis and informed disease management decisions, including the selection of appropriate fungicide or oomycide strategies before infections reach economically damaging levels.