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Bioprotection against white rot of lettuce

White rot caused by Sclerotinia sp is a pathology affecting more than 400 species of lettuce, including annual vegetables and ornamental plants, causing heavy losses both in the field and post-harvest. White rot is caused by the following pathogens: Sclerotinia sclerotiorum and Sclerotinia minor, whose main differential is the size of sclerotia. Pathogens overwinter as sclerotia (resistance structure) in or on infected tissues, sclerotia that have fallen to the ground, or as mycelium on dead or living plants. In spring or early summer, the sclerotia germinate and produce slender stalks ending in a small disc-shaped apothecium or cup 5 to 15 millimetres in diameter, in which asci and ascospores are produced. They discharge large quantities of ascospores into the air over a period of 2 to 3 weeks. The ascospores are dispersed, and if they land on senescent plant parts, such as old flowers or crop debris, they germinate and cause infection. The sclerotia themselves can also germinate and produce mycelium which, on contact with the plant, causes infection.  Symptoms are soft rot in non-lignified tissues, especially in crown and leaves, as well as the appearance of white cottony mycelium, with numerous sclerotia, white at first and black later (1 cm in diameter) in the affected area and finally the death of the plant. The disease can develop post-harvest under conditions of high humidity (plastic packaging) causing a decrease in quality or depreciation of the crop. In lettuce cultivation, it is one of the most important diseases mainly due to the difficulty of removing sclerotia from the soil and the high survival of sclerotia.  The control of this disease is based on avoiding increasing the presence of the pathogen (sclerotia) in the soil by carrying out: crop rotations, solarisation and avoiding excess irrigation.  At TRICHODEX, we have been researching for years to reduce the damage caused by this disease and the result of this research is TRICHOBOT. A technology-based product combining complexed microelements with Bacillus fermentation, with a high response under conditions of high disease incidence.

In vitro radial growth test

In tests carried out by certified companies, in two different locations and with artificial inoculation of the pathogen, TRICHOBOT obtains efficacies of 48.7-64% with disease levels above 70%. With TRICHOBOT, you provide your crops with a clean and effective solution, while avoiding the appearance of resistance. References Boland G. J., Hall R. (1994). Index of plant hosts of Sclerotinia sclerotiorum. Can. J. Plant Pathol. 16 93–108. 10.1080/07060669409500766 [CrossRef] [Google Scholar] [Ref list]

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