grandella larvae, there were very large differences between treatments for both common rue (F= 26.
Larval mortality: In terms of larval mortality, there were no differences between treatments for the common rue extract (F= 1.
Developmental effects: For the common rue extract, developmental times for both 4th (F= 0.
Substances present in the common rue extract showed antifeedant activity against H.
Antifeedant effect by common rue extracts was also demonstrated for the Colorado potato beetle, Leptinotarsa decemlineata (Coleoptera: Coccinellidae) 4th instar larvae and adults (Hough-Goldstein 1990), and repellency was shown for the cat flea, Ctenocephalides canis (Siphonaptera: Pulicidae) (Cox 1980).