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Cercospora Leaf Spot of Eggplant

Cercospora Leaf Spot of Eggplant

Cercospora melongenae

fungi

In a Nutshell

    Small, round, yellow and slightly sunken spots appear on the upper leaf sideSpots grow larger and merge, becoming brown and irregular with a yellow haloHeavy infection can lead to curly and unripe leaves followed by drop offHeavy infection leads to yield reduction

Hosts: %1$s

· Eggplant

Symptoms

The infection can occur at any growth stage and is visible on leaves, petioles and stems. Initial symptoms appear as small, round and slightly sunken spots on the upper side of the older, lower leaves. Over time, the spots grow larger, more irregular and surrounded by a yellow halo. Later on, the leaf spots are visible on both leaf surfaces. The older spots merge and take on different aspects, depending on their location on the leaf. They range from brown to steal-grey (on upper side) and light brown (lower side). If the infection is heavy, leaves become curly and can drop off. Even though the fungus does not infect the fruits directly, it can lead to reduced fruit growth because of the lower productivity of the plants.

Trigger

Cercospora melongenae is a plant-pathogenic fungus. The fungal spores can survive in plant debris and the soil for a minimum of 1 year. They are then carried in different ways onto the lower, older leaves. Most commonly they are spread by wind and water (rain and irrigation), but they can can be dispersed by infected tools and persons. It then moves up the stem to the younger foliage. Moisture and high relative humidity are favorable for the infection and development of the disease. It is thus more common during the rainy season (wet weather, continuous plant wetness).

Biological Control

Biological agents can help to control the infection. Bio-fungicides based on the bacteria Bacillus subtilis strain QST 713 can be used as foliar spray applications to compete with Cercospora melongenae. Plant extracts from Azadirachta indica (neem oil) may be helpful to control the infection, too.

Chemical Control

An integrated approach should always be considered to control the disease. If fungicides are needed, products containing chlorothalonil, mancozeb or octanoic acid in combination with copper salt can be used as foliar spray and soil applications.

Preventive Measures

    Plant resilient tolerant or resistant varietiesUse healthy or certified pathogen-free seed and plant materialMaintain increased space between plants to ensure good ventilation and avoid the spread of the diseaseEnsure sufficient fertilizationAvoid over-irrigation to reduce humidity and do not use of overhead sprinklersWater in the morning rather than in the eveningAvoid working when plants are wetAvoid excessive weed growthRemove or destroy infected plants and your waste by burning or plowing itCrop rotation with non-host crops is recommended for the given period