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Dried leaves from rocky mountain plants decrease infestation by stored-product beetles.

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Aromatic plant extracts, specifically Artemisia tridentata and Monarda fistulosa, effectively deterred Mexican bean weevil egg-laying. These natural compounds show potential for pest control in stored products.

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Area of Science:

  • Agricultural Science
  • Entomology
  • Natural Product Chemistry

Background:

  • Stored product pests like the Mexican bean weevil (Zabrotes subfasciatus) and rice weevil (Sitophilus oryzae) cause significant crop losses.
  • There is a need for natural, effective, and environmentally friendly pest control methods.
  • Plant-derived compounds, particularly terpenoids, are known for their insecticidal properties.

Purpose of the Study:

  • To evaluate the efficacy of two aromatic plant species, Artemisia tridentata and Monarda fistulosa, in inhibiting oviposition by Zabrotes subfasciatus and Sitophilus oryzae.
  • To investigate the role of plant volatiles and physical presence in insect deterrence.
  • To identify key volatile terpenoid compounds responsible for the observed effects.

Main Methods:

  • Leaves of Artemisia tridentata and Monarda fistulosa were processed using a patented method.
  • Inhibition of oviposition was tested against Zabrotes subfasciatus in beans and Sitophilus oryzae in wheat at various concentrations.
  • Gas chromatography-mass spectrometry (GC-MS) was used to analyze the volatile chemical composition of the plant materials.

Main Results:

  • Artemisia tridentata and Monarda fistulosa extracts significantly inhibited oviposition by Zabrotes subfasciatus at concentrations below 1% w/w.
  • Monarda fistulosa showed concentration-dependent activity against Sitophilus oryzae, but efficacy was below 50% even at 3% w/w.
  • Camphor, 1,8-cineole, and carvacrol were identified as major volatile terpenoids in the tested plant species.

Conclusions:

  • Aromatic plant extracts, particularly Artemisia tridentata and Monarda fistulosa, show promise as natural oviposition deterrents for the Mexican bean weevil.
  • Volatile compounds are likely the primary agents responsible for the insecticidal activity of these plants.
  • Further research into these plant-derived compounds could lead to novel, sustainable pest management strategies for stored grains and legumes.