The pathogen is defined as a biological agent that causes disease. The number and types of pathogens that affect garden plants, can instill a constant fear. They include almost all of the biological spectrum. Their action may be temporary as in the case of biting insects, or permanent, as in viral infection. The human body is a favorable environment for the functioning and reproduction of pathogenic organisms, which include viruses, bacteria, protozoa pathogens, and others. Most of them can not survive for long outside the human body, but it is a short period of time is sufficient for entering them into the body of a new host .
