Abstract
This study investigated the acaricidal and insecticidal effect of local lupin (Lupinus albus L. Fabaceae) seed extract against Tetranychus urticae Koch (Acari: Tetranychidae), Callosobruchus maculatus F. (Coleoptera: Chrysomelidae), Plodia interpunctella (Hubner) (Lepidoptera: Pyralidae) and metabolite content of seeds. In tests for T. urticae leaf-disk bioassay was employed. Contrarily, two μL of the L. albus extract were topically applied using a micro-applicator on C. maculatus and P. interpunctella. In the assays of T. urticae and P. interpunctella, the concentrations of 0.78, 1.56, 3.12, 6.25, 12.5, 25% (w/w) of the plant extracts were used. Furthermore, the concentrations of 0.625, 1.25, 2.50, 5, 10% (w/w) were applied to C. maculatus. Mortality data was collected 24, 48 and 72 hours after application. In the results, L. albus extract was found to be quite effective to C. maculatus adults with LD50 of 7.26, 1.21 and 0.55% after 24, 48 and 72 hours, respectively. Moreover, lupin extract was effective to T. urticae adults with LC50 values of 4.03, 3.15 and 2.73% for the same durations. L. albus extract was showed low insecticidal effect against the larvae of P. interpunctella. In seeds metabolite content were detected, which contained 686.99 mg GAE / 100 mg total phenol, 22.06 mg QE / 100 mg total flavonoid, DPPH 26.04 mg TE / 100 g having antioxidant activity. The bitter taste of stem and seeds of the plant is due to their metabolite content which has a toxic effect. In conclusion, results indicated that lupin seed has a high secondary metabolites content and also its extract had the high toxic effect against T. urticae and C. maculatus.
Highlights
Pests have a negative effect on the growth of culture plants grown in greenhouses and fields, resulting in the loss of stored products
Potential risks posed by synthetic chemical pesticides for mammals, consumer concerns regarding insecticide residues, and increased resistance of pest populations against insecticides, have encouraged researchers to discover new approaches for pest management
The aim of this study was to determine of metabolite content of lupin seed and evaluating the insecticidal and acaricidal activities of its extracts against C. maculatus, T.urticae and Plodia interpunctella
Summary
Pests have a negative effect on the growth of culture plants grown in greenhouses and fields, resulting in the loss of stored products. Tetranychus urticae Koch (Acarina: Tetranychidae) is a major polyphagous pest that damages many agricultural crops both in the field and in greenhouses. Synthetic chemical pesticides have been used widely in pest management. Potential risks posed by synthetic chemical pesticides for mammals, consumer concerns regarding insecticide residues, and increased resistance of pest populations against insecticides, have encouraged researchers to discover new approaches for pest management. The approach of using plants for insecticide production has been brought up by different researchers (Gökçe et al 2007; Erdoğan et al 2012; Elma 2014; Ali et al 2017). Given the destructive nature of synthetic chemical insecticides, it is critical to develop safe and environment friendly resources for better and safer pest management
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