Effect of 6-methoxybenzoxazolin-2-one (MBOA) on the reproduction rate of the grain aphid (Sitobion avenae F.).
Partial host-plant resistance could make a substantial contribution to reducing the damage caused by economically important grain aphids and, therefore, to reduced insecticide use. Naturally occurring hydroxamic acids, in particular 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), have been shown to be involved in the resistance of cereals to insects. DIMBOA is unstable in aqueous solutions and has been reported to decompose to 6-methoxybenzoxazolin-2-one (MBOA). MBOA was tested on grain aphids living on artificial diet incorporated with MBOA. From 0 to 0.1 mM, the intrinsic rate of increase (rm) increased. From 0.1 to 0.3 it decreased by 73%. The rm was calculated to be 0 at 1.0 mM. Consequently, even low concentrations of MBOA may reduce the aphid multiplication to a level below the economic damage threshold. Therefore, it is possible to breed wheat varieties with a sufficiently high content of DIMBOA to decrease grain aphid populations.
Department of Integrated Pest Management, Danish Institute of Agricultural Sciences, Research Centre Flakkebjerg, DK-4200 Slagelse, Denmark.
Lars M
LM
Hansen
D000818:Animals; D001042:Aphids / Q000254:growth & development*; D048588:Benzoxazines; D001583:Benzoxazoles / Q000008:administration & dosage*; D001947:Breeding; D004032:Diet; D002523:Edible Grain; D007306:Insecticides; D010078:Oxazines / Q000032:analysis; D014908:Triticum / Q000737:chemistry / Q000254:growth & development
D048588:Benzoxazines; D001583:Benzoxazoles; D007306:Insecticides; D010078:Oxazines; C031896:6-methoxybenzoxazolinone; C050733:2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one