Wax Removal and Diamondback Moth Performance in Collards Cultivars
| Autor: | Nilson Rodrigues-Silva, Silva Ga, Marcelo Coutinho Picanço, R. M. Pereira, E. A. Queiroz, T. C. Souza, D. O. Ferreira, Gerson Adriano Silva |
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| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
Oviposition Brassica Moths 01 natural sciences Insect Control Epicuticular wax Lepidoptera genitalia Botany Animals Cultivar Herbivory Wax Diamondback moth biology Plutella biology.organism_classification Plant Leaves 010602 entomology Horticulture Plutellidae Insect Science visual_art Larva Waxes visual_art.visual_art_medium Brassica oleracea Female 010606 plant biology & botany |
| Zdroj: | Neotropical entomology. 46(5) |
| ISSN: | 1678-8052 |
| Popis: | The diamondback moth Plutella xylostella (Linnaeus, 1758) (Lepidoptera: Plutellidae) is an herbivorous specialist on Brassicaceae species. Brassicas spp. plants developed a range of defenses (chemical, physical, and morphological) to prevent herbivores attack. In this study, we reported the antixenotic and antibiotic effects of outermost layer of two species of epicuticular wax of Brassicaceae, Brassica oleracea L. var. “Santo Antonio,” and Hybrid Kope F1 100MX, on larvae and adult of P. xylostella. In the choice experiment, P. xylostella adults showed an oviposition preference for collard cultivars Santo Antonio (control) and Hybrid Kope F1 100MX with wax removal. In the no-choice experiment, oviposition was 6.4 times higher in the Hybrid Kope F1 100MX with wax removal than without wax removal. There were significant differences among larvae feeding on leaf disks of Hybrid Kope F1 100MX in the treatments with (65.3 mg) and without wax removal (23.5 mg). The net reproduction rate (R 0 ), and intrinsic (rm) and finite rates of increase (λ) of P. xylostella in the cv. Santo Antonio were bigger in the treatment without wax removal (R 0 = 50.4, rm = 0.23 and λ = 1.26) than treatment with wax removal (R 0 = 28.5, rm = 0.20 and λ = 1.22). However, only the R 0 value was affected by mechanical wax removal in the Hybrid Kope F1 100MX (with wax removal R 0 = 43.3 and without wax removal R 0 = 30.8). In conclusion, the results indicate that collard’s wax is important to accessibility and development of P. xylostella, and its removal changes the resistance of collard’s varieties to P. xylostella. |
| Databáze: | OpenAIRE |
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