Evaluation Au Laboratoire De L'effet Larvicide Du Baume De Cajou Et De Trois Huiles Végétales À Base Des Plantes De Tephrosia Purpurea, Ricinus Communis Et Thevetia Neriifolia Pour Contrôler Les Populations De Plutella Xylostella L. 1758 (Lepidoptere, Pl
European Scientific Journal
This study aims to evaluate the larvicidal effect of three vegetable oils: Tephrosia purpurea, Ricinus communis, Thevetia neriifolia, and cashew balm in the management of Plutella xylostella L. 1758 (Lepidoptere, plutellidae) pest insects of cabbage in the laboratory. The efficacy of the extracts has been compared to that of a synthetic insecticide (Lambda cyalothrin) and that of a 32 botanical pesticide (Topbio). Larval tests were carried out on larvae of stages 2 and 3. Two experiments were
... experiments were set up in this study. In the first experiment, the products were tested on the L3 stage of P. xylostella, with the doses of 100%, 75%, 50%, 25% and 10% while in the second, the same products were tested on the L2 stage of the same insect with the doses of 50%, 25%, 10%, 5%, 3%, 2% and 1% compared to the reference control Lambda cyalothrin at the doses of 10%, 5%, 3 %, 2%, 1%, 0.5%. The mortalities were read 24 hours after exposure until the ninth day. The device used for biological tests is a completely randomized block. Abbott's formula has been used to correct mortality rates for treated insects. The variables measured are the mortality rate, the formation of pupae and the emergence of adults. These variables are subjected to an analysis of variance with the XLSTAT software version 2019. The LD 50 for eight days were determined according to the Cox regression method of determining the dose corresponding to a proportion. The results showed that vegetable oils and cashew balm are the promising species in the management of dose-dependent P. xylostella. For the first experiment, the mortality rates of L3 larvae of P. xylostella were not significantly different between the 25% application doses of Topbio and T. purpurea. Mortalities ranging from 100% were recorded with the doses of 100%, 75%, 50% and 25% of all the products used on the L2 and L3 stages. During the second experiment, 100% mortality was recorded at an application dose of 10% respectively for Topbio, T. purpurea, CNSL, and R. communis. No significant difference was recorded at the 5% threshold between the 10% doses of T. purpurea and 3% of the reference control Lambda cyalothrin. Witnesses recorded the highest rate of pupae and adults. These two parameters were a function of the dose. For all the products used, whatever the larval stage of P. xylostella, the effect / dose response was significant. Cashew balm and the three vegetable oils are positioned as an alternative to synthetic pesticides that can be used in market gardening.