Author/Authors :
aouinty, b. université hassan ii de casablanca - faculté des sciences et techniques mohammedia - equipe microbiologie hygiène et molécules bioactives, lvmqb / etb, Casablanca, Morocco , aouinty, b. centre régionale des métiers d’education et de formation (crmef) - department des sciences de la vie et de la terre, Casablanca, Morocco , chennaoui, m. centre régionale des métiers d’education et de formation (crmef) - department des sciences de la vie et de la terre, Casablanca, Morocco , mahari, s. université hassan ii de casablanca - faculté des sciences et techniques mohammedia - equipe microbiologie hygiène et molécules bioactives, lvmqb / etb, Casablanca, Morocco , rihane, a. centre régionale des métiers d’education et de formation (crmef) - department des sciences de la vie et de la terre, Casablanca, Morocco , rihane, a. université hassan ii de casablanca - department de biologie, laboratoire d’ecologie et d’environnement-faculté des sciences, Casablanca, Morocco , mellouki, f. université hassan ii de casablanca - faculté des sciences et techniques mohammedia - equipe microbiologie hygiène et molécules bioactives, lvmqb / etb, Casablanca, Morocco
Abstract :
The present work is part of the control mosquito, it’s of interest to study the biocidal action of the aqueous extract of Ricinus communis L. leaves against mosquito larvae. The toxic action of this aqueous extract, tested as larvicide, was studied on the larvae of the L2 and L4 stages of the Culex pipens mosquito. Mortality kinetics and larval histopathology were studied. Larvae of Culex pipiens exposed of Ricinus communis aqueous extract showed significant histological changes. After one hour of exposure, the cells of the middle intestine are deeply affected, the toxic substances ingested have manifested their activity on the intestinal epithelium. Hypertrophy and lysis of epithelium intestinal cells are the main changes observed. The toxic action of the aqueous extract is also manifested on the musculature and the external teguments of larvae. After 3 hours of exposure, total tissue lysisis observed. At low concentration, the toxic action of aqueous extract has effectively manifested as a biocide, by absorption on the digestive tractandby external contact on the teguments and the musculature.
Keywords :
control , Culex pipiens , mortality , biocide , toxicity larvicide
