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Systemin (Sys) foliar applications on S. littoralis larvae. (A) Mean weight (± S.E., standard error) of S. littoralis larvae feeding on control and treated leaves. (B) Survival rate of experimental S. littoralis larvae. Asterisks denote statistically significant differences (one-way Analysis of Variance, ANOVA: **** p < 0.00001). A group of 32 larvae was used for each experimental condition and the experiment was repeated twice.
