Effects of 1,4-benzoxazin-3-one derivatives from maize on survival and fecundity of Metopolophium dirhodum (Walker) on artificial diet

Effects of 2-beta -D-glucopyranosyloxy-4-hydroxy-7-methoxy-1,4-benzoxazin-3 -one (DIMBOA-Glc) and DIMBOA-Glc N-O-methylated (HDMBOA-Glc), two compounds present in high concentration in maize, were rested on the aphid Metopolop hium dirhodum reared on artificial diet. HDMBOA-Glc and DIMBOA-Glc decrease survival of adults with an LD50 of 1 mM and 5.6 mM, respectively, after 72 hr of feeding. These compounds also decrease the fecundity of the aphids a t concentrations of 2 mM and 1 mM, respectively. At concentrations of 2 mM HDMBOA-Glc and 8 mM DIMBOA-Glc in the diet, the average lifetime fecundity of 10 females is near zero. Offspring mortality on diet with 2 mM DIMBOA-Gl c is significantly higher than with the control diet. In contrast, HDMBOA-G lc has no effect on the survival of offspring. The possibility that these c ompounds protect Poaceae against aphids is discussed.