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Solenopsis invicta  Buren (Hymenoptera: Formicidae; red imported fire ant) is an invasive species in several parts of the world. A major contributor to the spread of  S. invicta  is infested shipping containers. The vapor of allyl isothiocyanate (AITC), a naturally occurring organosulfur compound, is highly toxic to  S. invicta ; however, AITC is highly volatile. Microencapsulation of AITC in polyethylene (PE) resin slows the release of AITC, making it a potentially useful material for preventing  S. invicta  infestations. Here, we examined the efficacy of AITC microencapsulated in PE (mAITC) as a repellent against  S. invicta  infestation of cardboard boxes, a common containerized cargo. Using baited cardboard boxes, we found that the number of  S. invicta  individuals entering boxes containing an mAITC sheet was significantly less than that entering boxes without an mAITC sheet. When a PE cover, which is often used to protect carboard boxes during shipping, was used, vapor concentrations of AITC inside the boxes were increased and the number of  S. invicta  individuals entering the boxes was reduced almost to zero. These findings indicate that mAITC sheeting, especially in combination with a PE cover, is a promising material for the protection of containerized cardboard-box cargo against  S. invicta  infestation.

applied entomology and zoology

Effectiveness of allyl isothiocyanate microencapsulated in polyethylene as a repellent against Solenopsis invicta (Hymenoptera: Formicidae) infestation of corrugated cardboard boxes in field experiment