Study of different formulations based on Crataeva religiosa Forst as bioinsecticide against Plutella xylostella L. (Lepidoptera: Plutellidae) main cabbage pest

Abstract

Despite these advances, P. xylostella has maintained its status as a major cabbage pest, Brassica oleracea. Biopesticides have been shown to be effective against the moth and environmentally friendly. The objective is to test, in real environment the effect of an aqueous treatment with Crataeva religiosa on cabbage moth and on the weight of apples compared to different formulations and doses on plots located in the Niayes area. A block device with six treatments (aqueous extract of dry leaves at different concentrations C1, C2 and C3, aqueous extract of fresh leaves (FF) and soap extracts (S) and Crataeva extracts mixed with soap (SC = soap + Crataeva) and two controls are used due to one repeat per treatment. Results showed that untreated plots were more infested with P. xylostella larvae (P <0.001) and positively correlated with the number of affected leaves (r = 0.26, P <0.001), therefore indirectly related to the weight of the apples. The efficacy of treatment on the larval population of Plutella was more noticeable with the fresh leaf formulation followed by soap extract plus Crataeva. As for the dry leaves formulation, there was no significant difference compared to controls and no dose effect was noted.