A. Givovich et Hm. Niemeyer, COMPARISON OF THE EFFECT OF HYDROXAMIC ACIDS FROM WHEAT ON 5 SPECIES OF CEREAL APHIDS, Entomologia experimentalis et applicata, 74(2), 1995, pp. 115-119
Feeding behaviour of five species of cereal aphids in wheat seedlings
differing in hydroxamic acid (Hx) levels, was monitored via electrical
penetration graphs (EPG). Aphid species could be grouped as sensitive
to the feeding deterrent effect of Hx in the seedlings (Rhopalosiphum
padi, Schizaphis graminum, Sitobion avenae, and Metopolophium dirhodu
m) or insensitive to them (Rhopalosiphum maidis). However, when feedin
g behaviour was studied in artificial diets containing Hx, all species
were equally sensitive to Hx. The behaviour of R. maidis was further
compared with that of R. padi through detailed EPG analysis. It was fo
und that the insensitivity of R. maidis to Hx in seedlings may be due
to a feeding strategy avoiding contact with the compounds by decreasin
g the number of cellular punctures in live tissues other than sieve el
ements during its way to the phloem.