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Murray B. Isman - One of the best experts on this subject based on the ideXlab platform.
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insecticidal and feeding deterrent activities of essential oils in the cabbage looper trichoplusia ni lepidoptera noctuidae
Journal of Applied Entomology, 2012Co-Authors: Z L Jiang, Yasmin Akhtar, X Zhang, Rod Bradbury, Murray B. IsmanAbstract:Ten essential oils were tested against the cabbage looper, Trichoplusia ni larvae for contact, residual and fumigant toxicities and feeding deterrent effects. Against third instar T. ni, Syzygium aromaticum (LD50 = 47.8 lg/ larva), Thymus vulgaris (LD50 = 52.0 lg/larva) (the two positive controls) and Cinnamomum glanduliferum (LD50 = 76.0 lg/larva) were the most toxic via topical application. Litsea pungens (LD50 = 87.1 lg/larva), Ilex purpurea (LD50 = 94.0 lg/larva), Cinnamomum cassia (LD50 = 101.5 lg/ larva) and Litsea cubeba (LD50 = 112.4 lg/larva) oils were equitoxic. Thymus vulgaris (LC50 = 4.8 mg/ml) and S. aromaticum (LC50 = 6.0 mg/ml) oils were the most toxic in residual bioassays. Cymbopogon citratus (LC50 = 7.7 mg/ml) and C. cassia (LC50 = 8.5 mg/ml) oils were equitoxic followed by Cymbopogon nardus (LC50 = 10.1 mg/ml) in this bioassay. The remaining five oils showed little or no residual effects. In a fumigation bioassay, L. cubeba (LC50 = 16.5 ll/l) and I. purpurea (LC50 = 22.2 ll/l) oils were the most toxic. Cinnamomum glanduliferum (LC50 = 29.7 ll/l) and Sabina vulgaris (LC50 = 31.2 ll/l) oils were equitoxic. Interestingly, S. aromaticum did not exhibit any fumigant toxicity. Cymbopogon citratus, C. nardus and C. cassia strongly deterred feeding by third instar T. ni (DC50s = 26.9, 33.8 and 39.6 lg/cm 2 , respectively) in a leaf disc choice bioassay. The different responses of T. ni larvae to the oils in different bioassays suggest that these essential oils exhibit different modes of action. Based on their comparable efficacy with essential oils already used as active ingredients in many commercial insecticides (i.e. clove oil and thyme oil), some of these essential oils may have potential as botanical insecticides against T. ni.
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evaluation of the toxicity of 17 essential oils against choristoneura rosaceana lepidoptera tortricidae and trichoplusia ni lepidoptera noctuidae
Pest Management Science, 2010Co-Authors: Cristina M Machial, Michael J. Smirle, Ikkei Shikano, Roderick Bradbury, Murray B. IsmanAbstract:BACKGROUND: The obliquebanded leafroller, Choristoneura rosaceana Harris, and the cabbage looper, Trichoplusia ni Hubner, are serious fruit and vegetable pests requiring multiple insecticide applications per year. To reduce non-target exposure to hazardous insecticides and to curb resistance development, alternative controls are required. Accordingly, a selection of 17 essential oils was screened against both lepidopteran pests, and the influence of azinphos-methyl resistance on essential oil toxicity to C. rosaceana was studied. RESULTS: Of the 17 essential oils screened, patchouli oil (Pogostemon cablin Benth.) and thyme oil (Thymus vulgaris L.) were selected for further testing against C. rosaceana, whereas patchouli oil, garlic oil (Allium sativum L.) and lemongrass oil (Cymopogon nardus L.) were selected for further testing against T. ni. LC50 and LD50 values confirmed that patchouli oil was the most toxic to C. rosaceana larvae, with LC50 = 2.8 µL mL−1 and LD50 = 8.0 µg insect−1. Garlic oil was the most toxic oil to T. ni larvae with LC50 = 3.3 µL mL−1 and LD50 = 22.7 µg insect−1, followed by patchouli oil and lemongrass oil. Azinphos-methyl-resistant leafrollers were 1.5-fold more tolerant to patchouli oil and 2.0-fold more tolerant to thyme oil. CONCLUSIONS: Based on these results, patchouli oil and other essential oils have sufficient efficacy to be considered as components of an essential oil-based insecticide that targets these lepidopteran pests. Copyright © 2010 Crown in the right of Canada. Published by John Wiley & Sons, Ltd
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Insecticidal activity of selected monoterpenoids and rosemary oil to Agriotes obscurus (Coleoptera: Elateridae).
Journal of economic entomology, 2005Co-Authors: Ranil Waliwitiya, Murray B. Isman, Robert S. Vernon, Andrew RisemanAbstract:Acute toxicities of three naturally occurring monoterpenoid essential oil constituents and the essential oil of rosemary were tested against late instars of Agriotes obscurus (L.) (Coleoptera: Elateridae). Both contact and volatile toxicities of thymol, citronellal, eugenol, and rosemary oil were determined. Also, phytotoxicity of these compounds was evaluated on corn germination and seedling development. Thymol had the greatest contact toxicity (LD50 = 196.0 microg/larva), whereas citronellal and eugenol were less toxic (LD50 = 404.9 and 516.5 microg/larva, respectively). Rosemary oil did not show any significant contact toxicity, even at 1,600 microg/larva. In terms of volatile toxicity, citronellal was the most toxic to wireworm larvae (LC50 = 6.3 microg/cm3) followed by rosemary oil (LC50 = 15.9 microg/cm3), thymol (LC50 = 17.1 microg/cm3), and eugenol (LC50 = 20.9 microg/cm3). Thymol, eugenol, and citronellal significantly inhibited corn seed germination and development, whereas rosemary oil had only minimal phytotoxic effects.
Cristina M Machial - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the toxicity of 17 essential oils against choristoneura rosaceana lepidoptera tortricidae and trichoplusia ni lepidoptera noctuidae
Pest Management Science, 2010Co-Authors: Cristina M Machial, Michael J. Smirle, Ikkei Shikano, Roderick Bradbury, Murray B. IsmanAbstract:BACKGROUND: The obliquebanded leafroller, Choristoneura rosaceana Harris, and the cabbage looper, Trichoplusia ni Hubner, are serious fruit and vegetable pests requiring multiple insecticide applications per year. To reduce non-target exposure to hazardous insecticides and to curb resistance development, alternative controls are required. Accordingly, a selection of 17 essential oils was screened against both lepidopteran pests, and the influence of azinphos-methyl resistance on essential oil toxicity to C. rosaceana was studied. RESULTS: Of the 17 essential oils screened, patchouli oil (Pogostemon cablin Benth.) and thyme oil (Thymus vulgaris L.) were selected for further testing against C. rosaceana, whereas patchouli oil, garlic oil (Allium sativum L.) and lemongrass oil (Cymopogon nardus L.) were selected for further testing against T. ni. LC50 and LD50 values confirmed that patchouli oil was the most toxic to C. rosaceana larvae, with LC50 = 2.8 µL mL−1 and LD50 = 8.0 µg insect−1. Garlic oil was the most toxic oil to T. ni larvae with LC50 = 3.3 µL mL−1 and LD50 = 22.7 µg insect−1, followed by patchouli oil and lemongrass oil. Azinphos-methyl-resistant leafrollers were 1.5-fold more tolerant to patchouli oil and 2.0-fold more tolerant to thyme oil. CONCLUSIONS: Based on these results, patchouli oil and other essential oils have sufficient efficacy to be considered as components of an essential oil-based insecticide that targets these lepidopteran pests. Copyright © 2010 Crown in the right of Canada. Published by John Wiley & Sons, Ltd
Charles H King - One of the best experts on this subject based on the ideXlab platform.
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molluscicidal effectiveness of luo wei a novel plant derived molluscicide against oncomelania hupensis biomphalaria alexandrina and bulinus truncatus
Infectious Diseases of Poverty, 2019Co-Authors: Shan Lv, Xibao Huang, Nengmin Zhang, Fathia Gawish, Mohamed R Habib, Mohamed A Elemam, Charles H King, Kun YangAbstract:Control of snail intermediate hosts has been proved to be a fast and efficient approach for interrupting the transmission of schistosomiasis. Some plant extracts have shown obvious molluscicidal activity, and a new compound Luo-Wei, also named tea-seed distilled saponin (TDS), was developed based on the saponins extracted from Camellia oleifera seeds. We aimed to test the molluscicidal activity of 4% TDS against the intermediate host snails in China and Egypt, and evaluate its environmental safety to non-target organisms. In the laboratory, Oncomelania hupensis, Biomphalaria alexandrina and Bulinus truncatus were exposed to 4% TDS, and the median lethal concentration (LC50) was estimated at 24, 48 and 72 h. In the field, snail mortalities were assessed 1, 2, 3 and 7 d post-immersion with 2.5 g/m3 4% TDS and 1, 3, 7 and 15 d post-spraying with 5 g/m2 4% TDS. In addition, the acute toxicity of 4% TDS to Japanese quail (Coturnix japonica), zebrafish (Brachydanio rerio) and freshwater shrimp (Macrobrachium nipponense) was assessed by estimations of LC50 or median lethal dose (LD50). In the laboratory, the LC50 values of 4% TDS for O. hupensis were 0.701, 0.371 and 0.33 mg/L at 24, 48 and 72 h, respectively, and 4% TDS showed a 1.975 mg/L 24 h LC50 against B. alexandrina, and a 1.396 mg/L 24 h LC50 against B. truncatus. Across all study regions, the pooled mortalities of O. hupensis were 72, 86, 94 and 98% at 1, 2, 3 and 7 d, following field immersion of 4% TDS at a dose of 2.5 g/m3, and were 69, 77, 85 and 88% at 1, 3, 7 and 15 d, following field spraying at 5 g/m2, respectively. 4% TDS had moderate toxicity to Japanese quail (7 d LD50 > 60 mg/kg) and to shrimp (96 h LC50 = 6.28 mg/L; 95% CI: 3.53–11.2 mg/L), whereas its toxicity to zebrafish was high (96 h LC50 = 0.15 mg/L; 95% CI: 0.14–0.17 mg/L). 4% TDS is active against O. hupensis, B. alexandrina and B. truncatus under laboratory and field conditions, and it may be a candidate molluscicide of plant origin.
Michael J. Smirle - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the toxicity of 17 essential oils against choristoneura rosaceana lepidoptera tortricidae and trichoplusia ni lepidoptera noctuidae
Pest Management Science, 2010Co-Authors: Cristina M Machial, Michael J. Smirle, Ikkei Shikano, Roderick Bradbury, Murray B. IsmanAbstract:BACKGROUND: The obliquebanded leafroller, Choristoneura rosaceana Harris, and the cabbage looper, Trichoplusia ni Hubner, are serious fruit and vegetable pests requiring multiple insecticide applications per year. To reduce non-target exposure to hazardous insecticides and to curb resistance development, alternative controls are required. Accordingly, a selection of 17 essential oils was screened against both lepidopteran pests, and the influence of azinphos-methyl resistance on essential oil toxicity to C. rosaceana was studied. RESULTS: Of the 17 essential oils screened, patchouli oil (Pogostemon cablin Benth.) and thyme oil (Thymus vulgaris L.) were selected for further testing against C. rosaceana, whereas patchouli oil, garlic oil (Allium sativum L.) and lemongrass oil (Cymopogon nardus L.) were selected for further testing against T. ni. LC50 and LD50 values confirmed that patchouli oil was the most toxic to C. rosaceana larvae, with LC50 = 2.8 µL mL−1 and LD50 = 8.0 µg insect−1. Garlic oil was the most toxic oil to T. ni larvae with LC50 = 3.3 µL mL−1 and LD50 = 22.7 µg insect−1, followed by patchouli oil and lemongrass oil. Azinphos-methyl-resistant leafrollers were 1.5-fold more tolerant to patchouli oil and 2.0-fold more tolerant to thyme oil. CONCLUSIONS: Based on these results, patchouli oil and other essential oils have sufficient efficacy to be considered as components of an essential oil-based insecticide that targets these lepidopteran pests. Copyright © 2010 Crown in the right of Canada. Published by John Wiley & Sons, Ltd
Ikkei Shikano - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the toxicity of 17 essential oils against choristoneura rosaceana lepidoptera tortricidae and trichoplusia ni lepidoptera noctuidae
Pest Management Science, 2010Co-Authors: Cristina M Machial, Michael J. Smirle, Ikkei Shikano, Roderick Bradbury, Murray B. IsmanAbstract:BACKGROUND: The obliquebanded leafroller, Choristoneura rosaceana Harris, and the cabbage looper, Trichoplusia ni Hubner, are serious fruit and vegetable pests requiring multiple insecticide applications per year. To reduce non-target exposure to hazardous insecticides and to curb resistance development, alternative controls are required. Accordingly, a selection of 17 essential oils was screened against both lepidopteran pests, and the influence of azinphos-methyl resistance on essential oil toxicity to C. rosaceana was studied. RESULTS: Of the 17 essential oils screened, patchouli oil (Pogostemon cablin Benth.) and thyme oil (Thymus vulgaris L.) were selected for further testing against C. rosaceana, whereas patchouli oil, garlic oil (Allium sativum L.) and lemongrass oil (Cymopogon nardus L.) were selected for further testing against T. ni. LC50 and LD50 values confirmed that patchouli oil was the most toxic to C. rosaceana larvae, with LC50 = 2.8 µL mL−1 and LD50 = 8.0 µg insect−1. Garlic oil was the most toxic oil to T. ni larvae with LC50 = 3.3 µL mL−1 and LD50 = 22.7 µg insect−1, followed by patchouli oil and lemongrass oil. Azinphos-methyl-resistant leafrollers were 1.5-fold more tolerant to patchouli oil and 2.0-fold more tolerant to thyme oil. CONCLUSIONS: Based on these results, patchouli oil and other essential oils have sufficient efficacy to be considered as components of an essential oil-based insecticide that targets these lepidopteran pests. Copyright © 2010 Crown in the right of Canada. Published by John Wiley & Sons, Ltd