Terpenoid concentration (ng/mg dw) in leaves of Bt and non-Bt cotton as affected by prior infestation with Heliothis virescens in a glasshouse experiment.

Terpenoid concentration (mean ± SE; n = 10) was measured in the youngest fully developed leaf of each Bt and non-Bt cotton plant that was uninfested or infested with H. virescens (3rd instar) for 7 days. HGQ: hemigossypolone; G: gossypol; H1/H4: heliocide 1 and 4; H2/H3: heliocide 2 and 3.Means in a row followed by different letters are significantly different (P≤0.05; Tukey HSD test).Terpenoid concentration (ng/mg dw) in leaves of Bt and non-Bt cotton as affected by prior infestation with Heliothis virescens in a glasshouse experiment.