Lecanicillium tenuipes

Lecanicillium tenuipes is an entomopathogenic fungus renowned in agricultural science for its ability to regulate populations of harmful insects. Rather than attacking plants, this fungus targets a wide range of invertebrate pests, making it a valuable tool in integrated pest management (IPM) strategies for both greenhouse and field crops.

The host range of Lecanicillium tenuipes is broad, commonly affecting pests such as whiteflies, aphids, thrips, and various spider mites. It is particularly effective on high-value horticultural crops, including greenhouse tomatoes, cucumbers, peppers, and various ornamental greenhouse plants that are prone to heavy infestations of these specific pests.

The infection process begins when fungal spores adhere to the insect's cuticle. After germination, the fungus penetrates the exoskeleton and invades the hemocoel. Visible symptoms include the insect's decreased mobility, cessation of feeding, and eventually, the emergence of a white or yellowish mycelial mat covering the deceased insect's body.

Environmental conditions are crucial for the spread and virulence of this fungus. High relative humidity, typically exceeding 80%, combined with moderate temperatures ranging from +20°C to +28°C, are optimal for spore germination and colonization. In arid conditions, the effectiveness of the fungus decreases significantly, limiting its natural spread.

Control measures primarily involve the application of bioinsecticides formulated with Lecanicillium tenuipes. Preventive strategies include regular monitoring of insect populations and the manipulation of humidity within protected structures to facilitate fungal activity. Using this biocontrol agent allows farmers to manage outbreaks without the heavy reliance on synthetic pesticides.