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Bargar TA, Jiang Y. Adult Mosquito and Butterfly Exposure to Permethrin and Relative Risk Following ULV Sprays from a Truck-Mounted Sprayer. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2024; 86:25-36. [PMID: 38062179 PMCID: PMC10830668 DOI: 10.1007/s00244-023-01022-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 07/27/2023] [Indexed: 02/01/2024]
Abstract
Ground applications of adulticides via a specialized truck-mounted sprayer are one of the most common practices for control of flying adult mosquitoes. Aerosols released to drift through a targeted area persist in the air column to contact and kill flying mosquitoes, but may also drift into adjacent areas not targeted by the applications where it may affect nontarget insects such as imperiled butterflies. This study compared the risk of permethrin to adult mosquitoes and adult butterflies to assess the likelihood that the butterflies would be affected following such sprays. Permethrin toxicity values were determined for Aedes aegypti and Culex quinquefasciatus (LD50s of 81.1 and 166.3 ng/g dw, respectively) and then combined with published toxicity data in a species sensitivity distribution for comparison with published permethrin toxicity data for adult butterflies. The sensitivity distributions indicated adult butterflies and mosquitoes are similarly sensitive, meaning relative risk would be a function of exposure. Exposure of adult butterflies and adult mosquitoes to permethrin was measured following their exposure to ULV sprays in an open field. Average permethrin concentrations on adult mosquitoes (912-38,061 ng/g dw) were typically an order of magnitude greater than on adult butterflies (110-11,004 ng/g dw) following each spray, indicating lower risk for butterflies relative to mosquitoes. Despite lower estimated risk, 100% mortality of adult butterflies occurred following some of the sprays. Additional studies could help understand exposure and risk for butterflies in densely vegetated habitats typical near areas treated by ULV sprays.
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Affiliation(s)
- Timothy A Bargar
- U.S. Geological Survey, Wetland and Aquatic Research Center, 7920 NW 71st Street, Gainesville, FL, 32653, USA.
| | - Yongxing Jiang
- City of Gainesville Mosquito Control, 405 NW 39th Ave, Gainesville, FL, 32609, USA
- Indian River Mosquito Control District, 5655 41st Street, Vero Beach, FL, 32967, USA
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Luu-dam NA, Le CVC, Satyal P, Le TMH, Bui VH, Vo VH, Ngo GH, Bui TC, Nguyen HH, Setzer WN. Chemistry and Bioactivity of Croton Essential Oils: Literature Survey and Croton hirtus from Vietnam. Molecules 2023; 28:2361. [PMID: 36903605 PMCID: PMC10005233 DOI: 10.3390/molecules28052361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 02/28/2023] [Accepted: 02/28/2023] [Indexed: 03/08/2023] Open
Abstract
Using essential oils to control vectors, intermediate hosts, and disease-causing microorganisms is a promising approach. The genus Croton in the family Euphorbiaceae is a large genus, with many species containing large amounts of essential oils, however, essential oil studies are limited in terms of the number of Croton species investigated. In this work, the aerial parts of C. hirtus growing wild in Vietnam were collected and analyzed by gas chromatography/mass spectrometry (GC/MS). A total of 141 compounds were identified in C. hirtus essential oil, in which sesquiterpenoids dominated, comprising 95.4%, including the main components β-caryophyllene (32.8%), germacrene D (11.6%), β-elemene (9.1%), α-humulene (8.5%), and caryophyllene oxide (5.0%). The essential oil of C. hirtus showed very strong biological activities against the larvae of four mosquito species with 24 h LC50 values in the range of 15.38-78.27 μg/mL, against Physella acuta adults with a 48 h LC50 value of 10.09 μg/mL, and against ATCC microorganisms with MIC values in the range of 8-16 μg/mL. In order to provide a comparison with previous works, a literature survey on the chemical composition, mosquito larvicidal, molluscicidal, antiparasitic, and antimicrobial activities of essential oils of Croton species was conducted. Seventy-two references (seventy articles and one book) out of a total of two hundred and forty-four references related to the chemical composition and bioactivity of essential oils of Croton species were used for this paper. The essential oils of some Croton species were characterized by their phenylpropanoid compounds. The experimental results of this research and the survey of the literature showed that Croton essential oils have the potential to be used to control mosquito-borne and mollusk-borne diseases, as well as microbial infections. Research on unstudied Croton species is needed to search for species with high essential oil contents and excellent biological activities.
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Affiliation(s)
- Ngoc Anh Luu-dam
- Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), No. 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100803, Vietnam
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, No. 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100803, Vietnam
| | - Canh Viet Cuong Le
- Mientrung Institute for Scientific Research, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), 321 Huynh Thuc Khang, Hue 530000, Thua Thien Hue, Vietnam
| | - Prabodh Satyal
- Aromatic Plant Research Center, 230 N 1200 E, Suite 100, Lehi, UT 84043, USA
| | - Thi Mai Hoa Le
- Faculty of Pharmacy, Vinh Medical University, 161 Nguyen Phong Sac, Vinh 461150, Vietnam
| | - Van Huong Bui
- Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), No. 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100803, Vietnam
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, No. 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100803, Vietnam
| | - Van Hoa Vo
- Department of Pharmacy, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam
| | - Gia Huy Ngo
- Department of Pharmacy, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang 5000, Vietnam
| | - Thi Chinh Bui
- Faculty of Biology, University of Education, Hue University, 34 Le Loi St., Hue 530000, Vietnam
| | - Huy Hung Nguyen
- Department of Pharmacy, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang 5000, Vietnam
| | - William N. Setzer
- Aromatic Plant Research Center, 230 N 1200 E, Suite 100, Lehi, UT 84043, USA
- Department of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USA
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Norris EJ, Bloomquist JR. Co-Toxicity Factor Analysis Reveals Numerous Plant Essential Oils Are Synergists of Natural Pyrethrins against Aedes aegypti Mosquitoes. INSECTS 2021; 12:154. [PMID: 33670293 PMCID: PMC7917600 DOI: 10.3390/insects12020154] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 02/03/2021] [Accepted: 02/07/2021] [Indexed: 11/17/2022]
Abstract
With insecticide-resistant mosquito populations becoming an ever-growing concern, new vector control technologies are needed. With the lack of new chemical classes of insecticides to control mosquito populations, the development of novel synergists may improve the performance of available insecticides. We screened a set of 20 plant essential oils alone and in combination with natural pyrethrins against Aedes aegypti (Orlando) female adult mosquitoes to assess their ability to synergize this natural insecticide. A co-toxicity factor analysis was used to identify whether plant oils modulated the toxicity of natural pyrethrins antagonistically, additively, or synergistically. Both knockdown at 1 h and mortality at 24 h were monitored. A majority of oils increased the toxicity of natural pyrethrins, either via an additive or synergistic profile. Many oils produced synergism at 2 µg/insect, whereas others were synergistic only at the higher dose of 10 µg/insect. Amyris, cardamom, cedarwood, and nutmeg East Indies (E.I.) oils were the most active oils for increasing the mortality of natural pyrethrins at 24 h with co-toxicity factors greater than 50 at either or both doses. A number of oils also synergized the 1 h knockdown of natural pyrethrins. Of these, fir needle oil and cypress oils were the most successful at improving the speed-of-action of natural pyrethrins at both doses, with co-toxicity factors of 130 and 62, respectively. To further assess the co-toxicity factor method, we applied selected plant essential oils with variable doses of natural pyrethrins to calculate synergism ratios. Only the oils that produced synergistic co-toxicity factors produced statistically significant synergism ratios. This analysis demonstrated that the degree of co-toxicity factor correlated well with the degree of synergism ratio observed (Pearson correlation coefficient r = 0.94 at 2 µg/insect; r = 0.64 at 10 µg/insect) and that the co-toxicity factor is a useful tool in screening for synergistic activity.
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Affiliation(s)
- Edmund J. Norris
- United States Department of Agriculture, Center for Medical, Agricultural, and Veterinary Entomology, Gainesville, FL 32610, USA
- Emerging Pathogens Institute, Entomology and Nematology Department, University of Florida, Gainesville, FL 32610, USA;
| | - Jeffrey R. Bloomquist
- Emerging Pathogens Institute, Entomology and Nematology Department, University of Florida, Gainesville, FL 32610, USA;
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