How rainfall, relative humidity and temperature influence volatile emissions from apple trees in situ

Volatile emissions from apple trees as analysed by TD-GC-MS increased with water deficit stress, i.e. lacking rainfall. Compound-specific relationships were found regarding correlation of release with temperature and RH, e.g. limonene, β-caryophyllene and (E, E)-α-farnesene were negatively correlated with these climatic parameters.