Each experiment was replicated six times for each
volatile at each concentration. Differences in color and
age of the plant material caused differences in the level
of damaged area between the experimental series. To
equalize these differences we included an untreated
control plot in each experimental series using material
from a single plant. After 24 h thrips were removed from
the leaf discs. The number of dead, i.e. not moving when
picked up with a fine brush, and live individuals were
determined indicating adult survival. The percentage of
silver damage area on the leaf discs was measured with
an image analysis system that consisted of a binocular