Im. Bayoun et al., TOXICITY OF SELECTED INSECTICIDES TO DIURAPHIS-NOXIA (HOMOPTERA, APHIDIDAE) AND ITS NATURAL ENEMIES, Journal of economic entomology, 88(5), 1995, pp. 1177-1185
Laboratory bioassays were done to identify insecticides with different
ial toxicity to Russian wheat aphid, Diuraphis noxia (Kurdjumov), and
associated parasites and predators. Fourteen insecticides were tested
against adults of 3 species of parasites and against 3rd instars of 4
species of coccinellids. The insects were exposed to insecticide resid
ues on inner surfaces of 20-ml glass vials. Ten insecticides were test
ed for contact and systemic toxicity against D. noxia adults. Among te
sted aphicides, acephate was the least toxic to both the parasites and
the predators and showed a relatively high systemic toxicity to D. no
xia. In contrast, malathion was highly toxic to both the parasites and
predators and showed low toxicity to D. noxia. The selective toxicity
of acephate to D. noxia suggests that this insecticide could be impor
tant for use in programs to manage D. noxia. The high selectivity of m
alathion against natural enemies suggests that this insecticide could
be valuable in insecticidal check studies for investigating natural en
emy efficacy.