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Hayes CC, Schal C. Repellency of N,N-diethyl-3-methylbenzamide (DEET) during host-seeking behavior of bed bugs (Hemiptera: Cimicidae) in binary choice olfactometer assays. JOURNAL OF MEDICAL ENTOMOLOGY 2024; 61:1016-1025. [PMID: 38839102 DOI: 10.1093/jme/tjae073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 05/08/2024] [Accepted: 05/17/2024] [Indexed: 06/07/2024]
Abstract
The bed bug (Cimex lectularius L.) is one of the most prolific and burdensome indoor pests, and suppression of bed bug populations is a global priority. Understanding bed bug behavior is important to the development of new tactics for their control. Major gaps exist in our understanding of how host cues, insecticide resistance, and exposure modality impact the repellency of formulated products to bed bugs. Here, we validate the use of a binary choice olfactometer for assessing bed bug repellency behaviors using N,N-diethyl-3-methylbenzamide (DEET) in a dose-dependent manner, while considering the role of host-associated stimuli (with vs. without CO2), exposure modality (olfactory vs. olfactory and contact), and resistance status (susceptible vs. resistant) on repellency. We observed that host-seeking insecticide-susceptible bed bugs were repelled only when olfactorily exposed to high concentrations of DEET. However, exposure to DEET by contact repelled insecticide-susceptible bed bugs at 100-fold lower dose of DEET. Further, we demonstrate for the first time that insecticide-resistant bed bugs were significantly more responsive to DEET than susceptible bed bugs. We conclude that the 2-choice olfactometer is an effective tool for assessing the behavioral responses of bed bugs to spatial and contact repellents.
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Affiliation(s)
- Christopher C Hayes
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Coby Schal
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
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Aak A, Hage M, Rukke BA. Biological control of Cimex lectularius with Beauveria bassiana: Effects of substrate, dosage, application strategy, and bed bug physiology. PEST MANAGEMENT SCIENCE 2023; 79:4599-4606. [PMID: 37432134 DOI: 10.1002/ps.7659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 07/06/2023] [Accepted: 07/11/2023] [Indexed: 07/12/2023]
Abstract
BACKGROUND Cimex lectularius L. (bed bug) (Hemiptera: Cimicidae) is a serious indoor pest worldwide, and this nuisance needs to be controlled using different methods in integrated pest management (IPM). Beauveria bassiana (Bals.-Criv.) Vuill. (Hypocreales: Cordycipitaceae) kills bed bugs, and insect pathogenic fungi may be utilized to control bed bugs in IPM. To increase knowledge of this methodology, forced exposure experiments were conducted with different formulations, doses, and substrates, using bed bugs in variable physiological states. RESULTS Both oil- and water-formulated fungal products showed significant improvement when conidial concentrations were raised in five steps from 0.02 to 2.0%. At low concentrations (0.02% in water) effects from substrate and application strategy were observed. Application on soft substrates (cotton and polyester) yielded significantly higher bed bug mortality rates than on harder substrates (paper, wood, and linoleum) with a final mortality of 35-63% against 8-10%. Multiple applications over time also improved B. bassiana's ability to kill bed bugs, and at low concentrations only a triple application on cotton showed 100% final mortality. Bed bug age and reproductive status significantly affected survival. Older and reproducing individuals showed higher mortality compared to newly emerged adults. Differences in feeding status also yielded differences in mortality timing, but only minor differences in final mortality rates. Egg production and hatching success were significantly reduced by some treatments. CONCLUSION B. bassiana appears to be an asset in the fight against bed bugs. Substrate, dosage, application strategy, and bed bug physiology are important factors to consider for optimal efficacy and safe indoor control with insect pathogenic fungi. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Anders Aak
- Department of Pest Control, Norwegian Institute of Public Health, Oslo, Norway
| | - Morten Hage
- Department of Pest Control, Norwegian Institute of Public Health, Oslo, Norway
| | - Bjørn Arne Rukke
- Department of Pest Control, Norwegian Institute of Public Health, Oslo, Norway
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Gordon JM, Santangelo RG, González-Morales MA, Menechella M, Schal C, DeVries ZC. Spatial distribution of histamine in bed bug-infested homes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 880:163180. [PMID: 37001661 PMCID: PMC10219852 DOI: 10.1016/j.scitotenv.2023.163180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 03/26/2023] [Accepted: 03/26/2023] [Indexed: 04/14/2023]
Abstract
Histamine is a component of the bed bug aggregation pheromone. It was recently identified as an environmental contaminant in homes with active bed bug infestations, posing a potential health risk to humans via skin contact or inhalation. It remains unclear how histamine is distributed in homes and if histamine can become airborne. In the present study, histamine levels in household dust were quantified from multiple locations within bed bug infested and uninfested apartments. Bed bug population levels were quantified using both traps and visual counts. The amount of histamine detected varied significantly with respect to sampling location, with the highest concentration of histamine quantified from bedding material. Infestation severity did not have a significant effect on histamine quantified at any location. Our results indicate that the bedroom should be the primary focus of histamine mitigation efforts, although histamine can be found throughout the home. Histamine quantified from homes without active bed bug infestations suggests that histamine from previous infestations can persist following pest eradication. These findings highlight the importance of histamine as a potential insect allergen and will be important for the development of targeted mitigation strategies of bed bug histamine.
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Affiliation(s)
- Johnalyn M Gordon
- Department of Entomology, University of Kentucky, Lexington, KY, USA.
| | - Richard G Santangelo
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Maria A González-Morales
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA; Defense Centers for Public Health-Aberdeen, Entomology Science Division, Pesticide Use and Resistance Monitoring Branch, Aberdeen Proving Ground, MD 21010, USA
| | - Mark Menechella
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Coby Schal
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Zachary C DeVries
- Department of Entomology, University of Kentucky, Lexington, KY, USA
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Akbar R, Khan IA, Alajmi RA, Ali A, Faheem B, Usman A, Ahmed AM, El-Shazly M, Farid A, Giesy JP, Aboul-Soud MAM. Evaluation of Insecticidal Potentials of Five Plant Extracts against the Stored Grain Pest, Callosobruchus maculatus (Coleoptera: Bruchidae). INSECTS 2022; 13:1047. [PMID: 36421950 PMCID: PMC9696586 DOI: 10.3390/insects13111047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 11/08/2022] [Accepted: 11/08/2022] [Indexed: 06/16/2023]
Abstract
Plant based insecticides are considered among the most economic and ecofriendly chemicals for the protection of plants and stored grains. The cowpea weevil (Callosbruchus maculatus) causes more than 90% damage to sored grains in three to six months. The current study investigates insecticidal potentials of five selected botanicals: Melia azedarach, Nicotiana rustica, Azadirachta indica, Nicotiana tabacum and Thuja orientalis. They are explored at six different concentrations (0.5, 1.0, 1.5, 2.0, 2.5 and 3.0%) against C. maculatus and compared to effects of distilled water which is used as a control. Toxicities of 3%(V/V) extracts of N. tabacum, N. rustica, A. indica and T. orientalis against C. maculatus were 100%, 86.11%, 80.56% and 72.22%, respectively. Maximum mortality was caused by N. tabacum and N. rustica (100%), followed by A. indica (82%), whereas minimum mortality was observed in T. orientalis (64%) at 2.5%. Several phytochemicals, alkaloids, saponins, diterphenes, phytosterol, flavonoids and phenols were identified in N. tabacum and N. rustica, while few were present in A. indica. Phytosterol was present in greatest abundance. Saponins were only detected in aqueous extracts of N. rustica and N. tabacum. Taken together, these results indicate the utility of N. tabacum, N. rustica and A. indica as potential botanicals to control pest beetle and cowpea weevil.
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Affiliation(s)
- Rasheed Akbar
- Department of Entomology, Faculty of Basic and Applied Sciences, The University of Haripur, Haripur 22062, Pakistan
| | - Imtiaz Ali Khan
- Department of Entomology, The University of Agriculture, Peshawar 25130, Pakistan
| | - Reem A. Alajmi
- Department of Zoology, College of Science King Saud University, Riyadh 11451, Saudi Arabia
| | - Ashraf Ali
- Department of Chemistry, Faculty of Natural Sciences, University of Haripur, Haripur 22062, Pakistan
| | - Brekhna Faheem
- Department of Zoology, Abdul Wali Khan University, Mardan 23200, Pakistan
| | - Amjad Usman
- Department of Entomology, The University of Agriculture, Peshawar 25130, Pakistan
| | - Ashraf M. Ahmed
- Department of Zoology, College of Science King Saud University, Riyadh 11451, Saudi Arabia
| | - Mohamed El-Shazly
- Pharmacognosy Department, Faculty of Pharmacy, Ain-Shams University, Organization of African Unity Street, Abassia, Cairo 11566, Egypt
- Pharmaceutical Biology Department, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo 12613, Egypt
| | - Abid Farid
- Department of Entomology, Faculty of Basic and Applied Sciences, The University of Haripur, Haripur 22062, Pakistan
| | - John P. Giesy
- Toxicology Centre, University of Saskatchewan, Saskatoon, SK S7N 5B3, Canada
- Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada
- Department of Integrative Biology, Michigan State University, East Lansing, MI 48824, USA
- Department of Environmental Sciences, Baylor University, Waco, TX 76706, USA
| | - Mourad A. M. Aboul-Soud
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh 11433, Saudi Arabia
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