Fig. 4.

Responses of alate Macrosiphum euphorbiae females to potato volatile organic compounds (VOCs) in the four-arm olfactometer (one treated arm vs. three control arms). a Time spent = Mean time spent in arm ±SE. b Entries = Mean number of entries in arm ± SE. 48 h = Potato VOCs collected 24–48 hr after collections commenced, 96 hr = Potato VOCs collected 72–96 hr after collections commenced. Ten replicates were done for each assay. Asterisks indicate statistically significant differences (P < 0.05, t-tests)