TOXICOLOGICAL AND BIOLOGICAL EFFECTS OF CERTAIN PLANT EXTRACTS ON LARVAL STAGE OF BLACK CUTWORM UNDER LABORATORY CONDITIONS

Sallam, Doaa R.; El-Kholy, Ramadan M.A.

doi:10.21608/ejdr.2025.358494.1198

TOXICOLOGICAL AND BIOLOGICAL EFFECTS OF CERTAIN PLANT EXTRACTS ON LARVAL STAGE OF BLACK CUTWORM UNDER LABORATORY CONDITIONS

Document Type : Original Article

Authors

¹ Entomology Unit, Department of Plant Protection, Desert Research Center, Cairo, Egypt

² Department of Plant Protection, Faculty of Agriculture, Cairo, Al-Azhar University, Egypt

10.21608/ejdr.2025.358494.1198

Abstract

The black cutworm (BCW), Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae) is distributed in many countries of the world and cause great losses on most vegetables and field crops. Under laboratory conditions, the toxicity of plant extracts (Camphor, Sea ambrosia and the Thorn apple) and pyriproxyfen as insect growth regulators (IGR) were investigated on the larval stage of black cutworm Agrotis ipsilon. The new 3^rd larval instar were treated with different concentrations (ppm) of the tested materials. Results clearly indicated that the pyriproxyfen (LC₅₀ value was 275.40 ppm) was the most effective than other plant extracts (PEs). The LC₅₀ values were 3850.36, 4230.15 and 4375,22 ppm for Damsissa, Camphor and Datoora leaf extracts, respectively. Treatments reduced food consumption, feeding ratio and larval weight, whereas increased larval duration and larval mortality %. The most effective compound was pyriproxyfen followed by Damsissa, Datoora and the least were Cafoor leaf extracts, respectively. The joint action of PEs at LC₂₅ with pyriproxyfen at LC₂₅ values showed that the mixture with Damsissa leaf extract was potentiation, followed by the mixture with Datoora and the mixture with Cafoor leaf extract (additive action). The corresponding rates of Co-toxicity factor were 39.51, 27.87 and 17.65% of the mixture with Damsissa, Datoora and Cafoor leaf extracts, respectively. This study concluded that the plant extracts and pyriproxyfen have insecticidal activity against Agrotis ipsilon larvae and the mixture of previous plant extracts with pyriproxyfen has a good result on larvae, especially with Damsissa leaf extracts and is possibly used as an alternative to conventional chemical insecticides.

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