Emamectin, a novel insecticide for controlling field crop pests

Area of Science:

• Agricultural Entomology
• Pest Management
• Insecticide Efficacy

Background:

• Emamectin is a macrocyclic lactone insecticide.
• It is recognized for its low toxicity to non-target organisms and the environment.
• Emamectin is a key component in integrated pest management programs for field crops.

Purpose of the Study:

• Evaluate the efficacy of emamectin against key agricultural pests.
• Compare emamectin's effectiveness on different pest species and life stages.
• Determine the residual activity of emamectin under field and laboratory conditions.

Main Methods:

• Field trials using spray concentrations of emamectin (e.g., 25 mg AI litre-1) on cotton.
• Laboratory and field assessments of emamectin against western flower thrips.
• Evaluating emamectin's activity on whiteflies and leafminers under laboratory conditions.

Main Results:

• Over 90% suppression of cotton bollworm (Helicoverpa armigera) larvae for 28 days.
• Effective control of Egyptian cotton leafworm (Spodoptera littoralis) for 3 days.
• Emamectin showed over 10-fold greater activity than abamectin against adult western flower thrips (Frankliniella occidentalis), with suppression up to 11 days for adults and 20 days for larvae.
• Considerable activity against whitefly (Bemisia tabaci) and leafminer (Liriomyza huidobrensis) in laboratory settings.

Conclusions:

• Emamectin is a potent insecticide for controlling major field crop pests, including Helicoverpa armigera and Frankliniella occidentalis.
• Its residual activity varies by pest species, with longer efficacy against H. armigera larvae.
• Further field research is needed to confirm emamectin's efficacy on Bemisia tabaci and Liriomyza huidobrensis.