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Side effects of insecticides on larvae of the aphid specific predator Episyrphus balteatus (Degeer) (Dipt. Syrphidae) in the laboratory


  • Jansen , J.P. (1998). Side effects of insecticides on larvae of the aphid specific predator Episyrphus balteatus (Degeer) (Dipt. Syrphidae) in the laboratory. Med. Fac. Landbouwwet. Univ. Gent, 63: (2b), 585-592.
Type Journal Article
Year 1998
Title Side effects of insecticides on larvae of the aphid specific predator Episyrphus balteatus (Degeer) (Dipt. Syrphidae) in the laboratory
Journal Med. Fac. Landbouwwet. Univ. Gent
Label jansen 1998 tap 504
Recnumber 146
Volume 63
Issue 2b
Pages 585-592
Endnote Keywords insecticides|predators|assessment|bifenthrin|cyfluthrin|cypermethrin|deltamethrin|lambda-cyhalothrin|esfenvalerate|fluvalinate|growth stages|insecticide residues|integrated pest management|laboratory tests|mortality|pest management|pirimicarb|phosalone|py
Abstract The effects of 9 insecticides on larvae of Episyrphus balteatus were investigated in the laboratory. The compounds examined were all registered to control cereal aphids in summer. They were tested at concentrations equivalent to the maximum field rate recommended for use in Belgium. Two- to 3-day-old E. balteatus larvae were exposed until pupation to insecticide residues freshly applied to glass Petri dishes. The reproductive performance of the adults obtained from these larvae was later evaluated in a fertility test. Results were related to a water-treated control and the reduction in beneficial capacity was calculated for each compound, in order to classify them according to the scheme approved by the IOBC Working Group "Pesticides and Beneficial Organisms". Cyfluthrin, cypermethrin, phosalone and pirimicarb caused 100% larval mortality. Only two larvae reached the pupal growth stage with deltamethrin and the adults failed to emerge. A corrected mortality of 78.1% and a mean production of 52.7 eggs/female were obtained with lambda -cyhalothrin but the eggs did not hatch. The reduction in beneficial capacity of these six compounds was equal to 100% and they were rated 'harmful' (category 4) for larvae of E. balteatus. Bifenthrin, esfenvalerate and fluvalinate gave much lower mortality rates. Nevertheless, the first two pyrethroids reduced the fertility of females and were classified as 'slightly harmful' (category 2). The reproductive performance of adults was not affected by fluvalinate (category 1). From these results it was concluded that fluvalinate had no effect on the aphid-specific predator E. balteatus and is suitable for use in integrated pest management of aphids in cereals. Bifenthrin and esfenvalerate also had little effect in the laboratory tests. It is pointed out that these tests can be considered as a worst case study, and it seems likely that the impact of these compounds on E. balteatus larvae in the field will be limited. Cyfluthrin, cypermethrin, deltamethrin, lambda -cyhalothrin, phosalone and pirimicarb were toxic in the laboratory and must be tested in semi-field or field situations for an adequate assessment of their side effects on hoverflies.
Notes Cited Reference Count: 25 ref.Conference paper, Journal articleEnglish
File TAP_504_-_Med__Fac__Landbouww__Univ__Gent,_632b,_585-592_(1998).pdf
Authors Jansen , J.P.