The invention pertains to processes to produce dry biomass of pyripyropene producer or-ganisms, processes to obtain pyripyropenes from such dry biomass, as well as to process-es to produce compounds of Formula III and/or Formula IV and/or Formula V from the pyri-pyropenes obtained from the dry biomass. The invention does further pertain to the dry bi-omass itself, as well as processes using said dry biomass to obtain pyripyropenes for the production of compounds of Formula III and/or Formula IV and/or Formula V, including pro-cesses using said dry biomass to obtain pyripyropenes or compounds of Formula III and/or Formula IV and/or Formula V in order to produce pest control compositions, in particular insecticides, comprising such compounds.本發明係關於製造吡里哌若平(pyripyropene)產生者生物體之乾生質的方法、自該乾生質獲得吡里哌若平的方法,及關於自該乾生質所得之吡里哌若平製造式III及/或式IV及/或式V之化合物的方法。本發明實際上進一步關於乾生質本身、及使用該乾生質以獲得用於製造式III及/或式IV及/或式V之化合物之吡里哌若平的方法,包括使用該乾生質以獲得吡里哌若平或式III及/或式IV及/或式V之化合物來製造包含該等化合物之害蟲控制組合物(特別是殺昆蟲劑)的方法。