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Flight behaviour of the aphid parasitoid Aphidius ervi towards tomato plants treated with Sys, Scp, and untreated (control) on intact leaves (A) or in hydroponics (B). Values indicate the percentage of females showing oriented flights and landings on source. Each assay was conducted using at least 100 females tested against 9 plants. Different letters indicate significant differences (G-test, p < 0.05).
