Abstract: The investigation on the growth of Pseudomonas sp.and the dynamics of its fatty acids under various culture conditions indicated that the optimum temperature for its growth was 30 ℃,and the best carbon source was starch.13 kinds of fatty acids were detected,among which,c16:1(n₇),c15:0, c16:0,c17:0,c18:1(n₆),c18:1(n₉),9,10cpc17:0 and iso9,10cpc17:0 were the major ones.When cultured at 30 ℃,the relative content of unsaturated fatty acids decreased significantly.Carbon source in the media was the crucial factor affecting the contents of odd- and cyclopropane fatty acids.Cluster analysis revealed that temperature had a more obvious effect than carbon source.

Key words: Beauveria bassiana, Emulsifiable conidia suspensions, Myzus persicae, Field trial, Aphid control