Related Experiment Video
Updated: Sep 3, 2025
08:53
Tick Artificial Membrane Feeding for Ixodes scapularis
Published on: November 30, 2022
3.4K
Mechanical Acaricides Active against the Blacklegged Tick, Ixodes scapularis
Elise A Richardson1, Loganathan Ponnusamy1, R Michael Roe1
1Department of Entomology and Plant Pathology, North Carolina State University, 3230 Ligon Street, Raleigh, NC 27695, USA.
Insects
|July 27, 2022
Summary
Industrial minerals like Celite and Imergard show promise as non-toxic alternatives for controlling blacklegged ticks (Ixodes scapularis). These minerals effectively kill ticks, potentially offering a new strategy against Lyme disease transmission.
Area of Science:
- Environmental Science
- Entomology
- Toxicology
Background:
- Lyme disease incidence is increasing in the US and Canada, primarily transmitted by the blacklegged tick (Ixodes scapularis).
- Existing control methods rely on chemical acaricides, facing challenges due to tick resistance and public demand for safer alternatives.
Purpose of the Study:
- To evaluate the efficacy of industrial minerals, specifically volcanic glass (Imergard) and Celite, as mechanical insecticides against blacklegged ticks.
- To explore a non-toxic alternative to chemical pesticides for tick control and Lyme disease prevention.
Main Methods:
- Exposure of unfed Ixodes scapularis nymphs (6-10 and 50-70 days old) to Celite and Imergard via dipping.
- Determination of time to 50% mortality (LT50) under controlled temperature (30 °C) and relative humidity (50% and 70% RH) conditions.
- Scanning electron microscopy to analyze tick surface coverage and respiratory system interaction with the minerals.
Main Results:
- Celite demonstrated significant efficacy, with LT50 values of 66.8 min at 30 °C/50% RH for younger nymphs and 81.7 min for older nymphs.
- A shorter LT50 (43.8 min) was observed for Celite at a higher relative humidity (70%).
- Imergard showed comparable efficacy to Celite, with an LT50 of 70.4 min at 30 °C/50% RH.
Conclusions:
- Industrial minerals, including Celite and Imergard, act as effective mechanical insecticides against blacklegged ticks.
- These minerals provide a potential non-toxic alternative to chemical acaricides for managing tick populations and mitigating Lyme disease risk.
- Further research is warranted to optimize application methods and assess broader environmental impact.
