Effection of Ocneridia volxemi Bolivar (Pamphaginae, Orthoptera) hoppers and adults by Beauveria bassiana (Deuteromycotina, hyphomycetes) conidia in an oil formulation.

Ocneridia volxemi Bolivar (Pamphaginae, Orthoptera) is one of the important insects pest in the heigh plains of north east of Algeria. Larval and adult stages caused severe damage to the leaves of cereals and an other various crops. Laboratory studies were conducted to the determine the potential of the fungus Beauveria bassiana for the control of the pest of larval and adults. Positive results were obtaved when larvae and adults were sprayed with different concentration of fungus conidia (D1: 2 x 10(6) conidia/ml, D2: 5 x 10(5) conidia/ml, D3: 8 x 10(4) conidia/ml, D4: 10(2) conidia/ml). Concentration at D1 and D2 in an oil formulation showed respectively 100% and 90 % larval mortality at the first day of treatment and 100%-9% adults mortality at the five day of treatement. The results revealed that the rates of infection and mortality were significantly related to the concentration of conidia in the corresponding samples. Beauveria bassiana can be considerd as a promising biocontrol agents of Ocneridia volxemi may be an other locuts, but field experimentation is necessary to subtantiate these finding.