The increasing demand for sustainable and environmentally friendly pest control methods has led to growing interest in the development of new plant-based pesticides. In this context, the objective of this study was to evaluate the efficacy of oils from Allium sativum , Annona muricata , Azadirachta indica , and the isolated compound d-limonene, as well as their combinations, in managing Tetranychus urticae . Bioassays were conducted on adults and eggs using 2% dilutions of the oils and the isolated compound, and exposure was achieved by direct spray and residual. The results showed that all oils individually exhibited significant efficacy against T . urticae in both exposure routes. All oils affected egg viability, reducing larval hatching rates. The combinations of oils resulted in higher adult mortality rates by spray exposure. Egg viability was reduced by up to 100% in the treatment combining A . sativum , A . muricata , and A . indica . The vegetable oils studied, particularly when combined, contribute to the development of more effective and environmentally safe strategies for managing T . urticae .
Piffer et al. (Wed,) studied this question.