Multiplex PCR is a powerful technique for viral detection that allows the simultaneous amplification of multiple DNA or RNA targets in a single reaction. Multiplex PCR, which simultaneously amplifies more than one locus in the same reaction, is an important clinical and research laboratory screening tool. This method is particularly valuable in plant virology as it enables the detection of several viruses or viral strains within the same sample, saving time and resources compared to performing individual PCR assays. By using multiple sets of primers specific to different viral sequences, multiplex PCR provides a comprehensive view of the viral population, which is crucial for diagnosing mixed infections and managing complex viral outbreaks. Additionally, this technique enhances diagnostic efficiency and accuracy, facilitates rapid screening of large numbers of samples, and helps in the development of more effective control measures and resistant plant varieties. The relative concentrations of the primers at the various loci, the concentration of the PCR buffer, the cycle temperatures, and the balance between the magnesium chloride and deoxynucleotide concentrations are all critical for a successful multiplex PCR experiment. Because the reaction has a greater number of primers, appropriate primer design is the key to the success of multiplex PCR reaction. Multiplex PCR is a key technique for the simultaneous detection for co-infection of viruses in one plant.