Susceptibility of Cydalima perspectalis (Lepidoptera: Crambidae) larvae to some reduced-risk insecticides in laboratory bioassays

Fatemeh Moradi Afrapoli, Mahmoud Mohammadi Sharif, Hasan Barimani Varandi and Masoumeh Shayanmehr
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Fatemeh Moradi Afrapoli: Department of Plant Protection, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
Mahmoud Mohammadi Sharif: Department of Plant Protection, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
Hasan Barimani Varandi: Research Division of Natural Resources, Mazandaran Agricultural and Natural Resources Research and Education Center, AREEO, Sari, Iran
Masoumeh Shayanmehr: Department of Plant Protection, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

Journal of Forest Science, 2022, vol. 68, issue 7, 253-262

Abstract: Box tree moth (BTM) Cydalima perspectalis (Walker, 1859) is the most harmful pest of different boxwood species in Europe and Asia including Caspian boxwood Buxus hyrcana in the Hyrcanian forests of Iran. Accessible and effective eco-friendly insecticides are required for the pest control. Thus, susceptibility of 2nd and 4th instar larvae of BTM to commercial formulation of Bacillus thuringiensis (Bt), two plant extract formulations, Bio1® and Matrine®, and three insect growth regulator (IGR) insecticides, chlorfluazuron, chromafenozide and diflubenzuron were investigated in laboratory bioassay. Except for diflubenzuron, significant mortality of both instar larvae was observed. At the endpoint of the experiments (96 h), 75.2-90% of second and 80-85% of fourth instar larvae had already died, as a result of feeding on leaves treated with the highest concentration of the insecticides. Furthermore, based on Probit analysis, Matrine® exhibited the highest efficiency (lethal concentration LC50 = 2.87 μL.L-1) on 2nd instar larvae and followed by Bio1® (8.07 μL.L-1), chlorfluazuron (173.3 μL.L-1) and Bt (326.3 mg.L-1). The LC50 of Matrine® and Bt for 4th instar larvae were 1.75 μL.L-1 and 335.8 mg.L-1, respectively. Our study revealed that Matrine® and chromafenozide could be alternatively used against BTM in situations where there is a permission and need to use insecticides.

Keywords: box tree moth; Bacillus thuringiensis; botanical insecticide; chromafenozide; Buxus spp (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnljfs:v:68:y:2022:i:7:id:67-2022-jfs

DOI: 10.17221/67/2022-JFS

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