White rot in lettuce (Sclerotinia sp. On lettuce)

One of the most important economic fungal diseases of lettuce is white rot.
Sclerotinia sp. overwinters in the form of sclerotium at soil.Sclerotia can keep it going for a long time in the soil and favorable conditions to achieve infection.
The pathogen attacks all parts of the plant, but mostly in lettuce leaves.
After realizing the infection and on favorable terms, around the infected tissue and body form white fungi.
The final stage is the formation of sclerotia, which are small black bodies (in the form of grain), representing potential biological material to achieve the primary infection.
Conditions for the exercise of infection
High soil moisture, high relative humidity and low temperatures are ideal conditions for the realization of the primary infection.
The percentage of infected plants (primary infection) depends on the presence of inoculum at the soil (sclerotia).
The exercise of secondary infection depends on external conditions.
Infection of Sclerotinia sp. often occurs in the formation of head lettuce.
Symptoms caused by the pathogen Sclerotinia sp.
During infection the leaves start to rot quickly, the lower part of plant water rot occurs.
The root system remains healthy, but with the rapid progress of the development of the disease, the plant “break up” and rot quickly covers the whole clove.
Inside the cocksfoot appear sclerotia sign that the pathogen “successfully accomplished the mission.”
Measures against white rot in lettuce
Regular airing is perhaps the most important requirement for the prevention of infection by Sclerotinia sp.
In conditions of intensive production to get quality product, monitoring weather conditions and based on that preparation program to feed and care is of great importance and are among the preventive measures to combat the diseases of plants.
Crop rotation is also of great importance because the planting of plants resistant to the fungus gradually reduced infectious material (sclerotia) in soil.
Drain and irrigation of the culture by its need is important preventative measure.
Removal of infected plants (and thus sclerotia) out of the building, which would prevent a potential primary infection.
The right to feed, especially intake of nitrogen fertilizer has a major role in strengthening immune system of crop. High doses of nitrogen in adverse weather conditions (cloudy, high relative humidity, low temperature) will lead to plant with less infection by Sclerotinia sp.
Proper use and rotation of these chemically active substances, as well as the establishment of proper proportion to other agro-technical operations significantly reduce the spread of the pathogen in the protected area.
However, our recommendation is to go to a professional – Advisory Team HORTICENTAR