Entomoplasmoses

Entomoplasmoses are plant diseases caused by members of the family Entomoplasmataceae, which belong to the class Mollicutes. These microorganisms are unique because they lack a cell wall, allowing them to exist as parasites within both plant phloem tissues and the bodies of various insect vectors, effectively bridging the biological gap between plants and insects.

These pathogens affect a wide variety of agricultural crops, ranging from vegetables to fruit trees. The infection cycle relies heavily on sap-sucking insects such as leafhoppers and aphids. Once an insect feeds on an infected plant, it acquires the pathogen, which then multiplies within the vector, ensuring that subsequent feeding activities spread the disease to healthy plants.

Clinical signs of the disease are characterized by systemic symptoms such as leaf yellowing (chlorosis), stunting, proliferation of axillary buds, and reduced fruit development. Infected plants often show stunted growth or malformation, which interferes with their physiological development and reduces the overall economic value of the harvest significantly.

Development and spread of the disease are highly dependent on environmental conditions that favor vector activity. Warm and dry periods usually lead to higher populations of insect vectors, resulting in rapid transmission of the pathogen. Field margins and weedy areas often serve as primary infection sources, harboring the pathogen throughout the off-season.

Effective control measures focus on integrated pest management (IPM) to minimize the impact of the disease. Key strategies include:

• Rigorous weeding to eliminate reservoir plants.
• Targeted insecticide applications to control insect vector populations.
• Utilization of certified, disease-free planting material.
• Implementing crop rotation to break the cycle of infection within specific fields.