Abstract
Heated greenhouses are a favorable environment for the development of pests. To reduce the excessive use of chemical pesticides against Bemisia tabaci in greenhouses in southern Tunisia, the improvement of biological control methods is necessary such as entomopathogenic fungi EPF. Microbiological control through the use of EPF is one of the means of control that preserves the environment. The pathogenicity of a commercial formulation based on Lecanicillium muscarium was tested on eggs and young and old larvae of B. tabaci in a geothermal cucumber greenhouse. The effect of L. muscarium was compared to two chemical pesticides based on Acetamiprid and Thiamethoxam and an untreated control. This fungus caused high reduction rates of eggs and larvae comparable to those caused by chemical pesticides. In the last week of monitoring, this fungus causes a reduction in eggs, second-stage larvae and fourth-stage larvae of B. tabaci respectively of 81.81%, 84.52% and 67.63%. As a result, L. muscarium can be used against B. tabaci in a geothermal greenhouse.
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