Pyridalyl, a novel insecticide: potency and insecticidal selectivity

Area of Science:

• Agricultural Entomology
• Insect Toxicology
• Chemical Ecology

Background:

• Pyridalyl represents a new class of insecticides with an unclassified mode of action.
• Understanding its selectivity is crucial for sustainable pest control strategies.

Purpose of the Study:

• To evaluate the insecticidal efficacy of pyridalyl against key agricultural pests.
• To assess the toxicity of pyridalyl to non-target organisms, including pollinators and predators.
• To determine the cytotoxicity of pyridalyl on insect and mammalian cell lines.

Main Methods:

• Laboratory bioassays using leaf-dipping and direct spray methods for insecticidal activity.
• Toxicity assessments on insect predator (Orius stringicollis) and pollinator (Bombus terrestris) via body-dipping and direct spray.
• Cytotoxicity evaluation using the trypan-blue exclusion method on Sf9 (insect) and CHO-K1 (mammalian) cell lines.

Main Results:

• Pyridalyl demonstrated high efficacy against all developmental stages of Spodoptera litura.
• Toxicity to Frankliniella occidentalis was comparable to or greater than acrinathrin.
• No acute toxicity was observed in Orius stringicollis or Bombus terrestris, with no impact on bee nests.
• Pyridalyl exhibited high toxicity to insect cells but negligible toxicity to mammalian cells.

Conclusions:

• Pyridalyl displays significant insecticidal activity and high selectivity, sparing beneficial insects and exhibiting minimal mammalian cytotoxicity.
• Its selective profile suggests potential for use in Integrated Pest Management (IPM) programs, particularly in greenhouse cultivation.