DIMBOA GLUCOSIDE, A WHEAT CHEMICAL DEFENSE, AFFECTS HOST ACCEPTANCE AND SUITABILITY OF SITOBION-AVENAE TO THE CEREAL APHID PARASITOID APHIDIUS-RHOPALOSIPHI
E. Fuentescontreras et Hm. Niemeyer, DIMBOA GLUCOSIDE, A WHEAT CHEMICAL DEFENSE, AFFECTS HOST ACCEPTANCE AND SUITABILITY OF SITOBION-AVENAE TO THE CEREAL APHID PARASITOID APHIDIUS-RHOPALOSIPHI, Journal of chemical ecology, 24(2), 1998, pp. 371-381
The influence of hydroxamic acids (Hx), plant secondary metabolites as
sociated with aphid resistance in wheat, on the host acceptance and su
itability of the aphid Sitobion avenae to the cereal aphid parasitoid
Aphidius rhopalosiphi was evaluated. Aphids showed a reduction in mean
relative growth rate and in body size in the wheat cultivar with high
er Hx level. Reduction in aphid size was related to a decreased succes
s in avoiding parasitoid oviposition. A minor increase in A. rhopalosi
phi developmental time was observed in aphids feeding on the higher Hx
cultivar. Experiments with different concentrations of DIMBOA glucosi
de, the main Hx in wheat, in artificial diets showed an increase in pa
rasitoid developmental time at the highest concentration, with no chan
ge in other performance variables. The evidence is discussed in relati
on to the compatible utilization of host-plant resistance and biologic
al control in integrated pest management.