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TY - JOUR AU - Costa-Arbulú, César AU - Gianoli, Ernesto AU - Gonzáles, Wilfredo L. AU - Niemeyer, Hermann M. PY - 2001 DA - 2001/02/01 TI - Feeding by the Aphid Sipha flava Produces a Reddish Spot on Leaves of Sorghum halepense: an Induced Defense JO - Journal of Chemical Ecology SP - 273 EP - 283 VL - 27 IS - 2 AB - Feeding by the aphid Sipha flava produces a reddish spot on mature leaves of Sorghum halepense. The present work is aimed at determining whether this plant response entails induced resistance against the aphid. Old and young leaves showed the same response to aphid feeding (reddish coloration). Water-stressed plants displayed a similar reddish coloration to aphid-infested plants. This was verified by evaluation of absorbance peaks of the respective leaf extracts. Aphid fecundity was reduced on previously infested (and hence reddish colored) leaves. However, aphid fecundity was not affected on water stressed plants. Furthermore, aphid survival was not different on artificial diets containing increasing concentrations of the reddish pigment. It is concluded that the reddish spot is correlated with, but is not itself responsible for, the observed induced resistance of S. halepense against S. flava. SN - 1573-1561 UR - https://doi.org/10.1023/A:1005676321251 DO - 10.1023/A:1005676321251 ID - Costa-Arbulú2001 ER -