Kocuria

Kocuria (lat. Kocuria) is a genus of Gram-positive bacteria, some representatives of which, particularly Kocuria rhizophila, act as opportunistic plant pathogens. Although this genus is traditionally associated with soil microflora, in modern agronomy it is identified as a causative agent of bacteriosis in various crops, affecting primarily the vascular system and leaf tissues.

This pathogen is most commonly found on vegetable crops, including tomatoes, cucumbers, and certain cereals. The bacteria are capable of colonizing the rhizosphere, entering the plant through the root system or micro-injuries in the epidermis, which leads to systemic infection of the organism.

The main symptoms of infection include leaf chlorosis, the appearance of irregular necrotic spots with a yellow halo, and subsequent wilting of individual plant parts. Under heavy infestation, there is a slowdown in shoot growth, leaf blade deformation, and a general loss of turgor pressure during daylight hours.

The development of the disease occurs most actively under conditions of high soil and air humidity, as well as during sharp temperature fluctuations. Bacteria can survive for a long time in plant residues and topsoil, becoming active under favorable environmental factors, such as high temperatures and excessive irrigation.

The harm caused by Kocuria lies in the reduction of the plants' photosynthetic activity, which leads to a significant loss of fruit marketability and a decrease in overall yield. In severe cases, the death of vegetative organs may occur, causing direct economic damage to agricultural producers.

Protection measures include a comprehensive approach:

• Use of healthy, certified planting material.
• Adherence to crop rotation and spatial isolation of crops.
• Disinfection of soil and farming equipment before the planting season.
• Application of biofungicides based on Bacillus subtilis strains to inhibit pathogen growth.