Toxicological screening of marine red algae Champia parvula (C. Agardh) against the dengue mosquito vector Aedes aegypti (Linn.) and its non-toxicity against three beneficial aquatic predators

• Main Authors: Parthiban Yogarajalakshmi, Thinnaur Venugopal Poonguzhali, Raja Ganesan, Sengodan Karthi, Sengottayan Senthil-Nathan, Patcharin Krutmuang, Narayanaswamy Radhakrishnan, Faruq Mohammad, Tae Jin Kim, Prabhakaran Vasantha-Srinivasan
• Format: Journal
• Published: 2020
• Subjects: Agricultural and Biological Sciences; Environmental Science
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85082706030&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/70048
• Institution: Chiang Mai University

© 2020 Elsevier B.V. Larval toxicity of ethanolic extract of C. parvula (Ex-Cp) was prominent in the second and the third instars at the maximum lethal dosage of 100 ppm with 98 and 97 % mortality rate respectively. The LC50 and LC90 was displayed at 43 ppm and 88 ppm dosage respectively. Correspondingly, the sub-lethal dosage (65 ppm) of Ex-Cp significantly alters the carboxylesterase (α and β), GST and CYP450 enzyme level in both III and IV instar larvae in dose-dependent manner. Similarly, the Ex-Cp displayed significant repellent activity (97 %) with a maximum level of protection time (210 min). Photomicrography assay of Ex-Cp (65 ppm) were toxic to dengue larvae as compared to control. The non-target toxicity of Ex-Cp against the beneficial mosquito predators displayed less toxicity at the maximum dosage of 600 ppm as compared to Temephos. Thus the present research delivers the target and non-target toxicity of red algae C. parvula against the dengue mosquito vector.