Action de quelques agents (huile essentielle et microbiologique) de lutte biologique sur cochenille blanche Parlatoria blanchardi Targ ; du palmier dattier.

Abstract

Our survey includes the application of a treatment by the slant of three biopesticides; an essential oil extracted of the lemon tree (Citrus), by the method of the hydrodistilation, and microbiological other; by the use of two bacterial species: Bacillus thuringiensis and Bacillus subtilis. The analysis of the results of the tests reveals certain efficiency. The use of essential oil provoked a rate of mortalities vary 59,18% to 23,25% according to the doses of applications (1ml, 0,5ml, 0,4ml, 0,2ml, 0,1ml), in a relatively short time lapse (06 hour), by report, to the treatments by Bacillus thuringiensis and Bacillus subtilis, that one supposes, that they are established to have more efficiency of action, nevertheless, with more of time to express their effect (24h to 48h), their death rates vary between 79,45% to 51,51% and 67,69% to 34,09%, respectively. All time, the importance of the auxiliary no negligible species, of which, it is necessary to take them in consideration.