Figure 6.

Effects of β-Tyrosine on Insect Growth.

(A) M. persicae reproduction on tobacco leaves taking up solutions containing 0, 20, 100, 500, 1000, or 4000 μM β-tyrosine or 4000 μM tyrosine (control) via the petioles. Aphid reproduction and actual concentration of β-tyrosine in the leaves on which aphids were feeding were measured. Mean ± se of n = 5, *P < 0.01, t test relative to 0 μM β-tyrosine.

(B) Black cutworm larval weight after 4 and 8 d on artificial diet containing 0, 100, 1000, or 10,000 μM β-tyrosine. Mean ± se of n = 6.

(C) Sugarcane borer larval weight after 6 and 12 d on artificial diet containing 0, 100, 1000, or 10,000 μM β-tyrosine. Mean ± se of n = 6, *P < 0.01, t test relative to 0 μM control.