Effects of some commonly-used foliar fungicides on springtails (collembola) in winter cereals
Effects of some commonly-used foliar fungicides on springtails (collembola) in winter cereals
Carbendazim (a selective fungicide) and the broad-spectrum compounds propiconazole, pyrazophos and triadimenol were screened in the laboratory to assess their toxicity to Sminthurinus aureus and all caused significant increases in mortality, pyrazophos being the most toxic. White sand and plaster of Paris were unsuitable as substrates for Collembola in toxicological experiments. Suction (D-vac) sampling in winter barley in 1985 showed that pyrazophos applied to replicated plots of area c. 2.7 ha significantly reduced populations of five out of 11 species of surface-dwelling Collembola (Sminthurus viridis, Sminthurinus elegans, S. aureus, Jeannenotia stachi and Isotoma viridis). Reductions in populations were large when compared with the effects of the broad-spectrum insecticide dimethoate. Suction and pitfall trap sampling in winter wheat in 1986 showed that populations of seven out of 13 surface-dwelling Collembola species (S. viridis, S. elegans, Deuterosminthurus spp., J. stachi, Pseudosinella alba, Lepidocyrtus cyaneus and I. viridis) were significantly reduced by applications of carbendazim, propiconazole and triadimenol to replicated 10m x 10m barriered and unbarriered plots. Nearly all the significant effects were in unbarriered plots and few ere detected by pitfall-trapping. Temporal patterns in populations of Collembola in wheat were investigated in summer 1987. All species exhibited a diurnal peak in catches on several dates, in contrast to the results of some other studies. Plant-climbing species were identified by sweep net sampling. The efficiencies of different methods for sampling surface-dwelling Collembola were compared and the number of samples needed for accurate sampling determined. The relevance of a correction for spatial variability in pre-treatment insect counts is discussed. The limitations of this and other recent pesticide studies are considered and recommendations for improvements are proposed.
University of Southampton
Frampton, Geoffrey Kenneth
1989
Frampton, Geoffrey Kenneth
Frampton, Geoffrey Kenneth
(1989)
Effects of some commonly-used foliar fungicides on springtails (collembola) in winter cereals.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Carbendazim (a selective fungicide) and the broad-spectrum compounds propiconazole, pyrazophos and triadimenol were screened in the laboratory to assess their toxicity to Sminthurinus aureus and all caused significant increases in mortality, pyrazophos being the most toxic. White sand and plaster of Paris were unsuitable as substrates for Collembola in toxicological experiments. Suction (D-vac) sampling in winter barley in 1985 showed that pyrazophos applied to replicated plots of area c. 2.7 ha significantly reduced populations of five out of 11 species of surface-dwelling Collembola (Sminthurus viridis, Sminthurinus elegans, S. aureus, Jeannenotia stachi and Isotoma viridis). Reductions in populations were large when compared with the effects of the broad-spectrum insecticide dimethoate. Suction and pitfall trap sampling in winter wheat in 1986 showed that populations of seven out of 13 surface-dwelling Collembola species (S. viridis, S. elegans, Deuterosminthurus spp., J. stachi, Pseudosinella alba, Lepidocyrtus cyaneus and I. viridis) were significantly reduced by applications of carbendazim, propiconazole and triadimenol to replicated 10m x 10m barriered and unbarriered plots. Nearly all the significant effects were in unbarriered plots and few ere detected by pitfall-trapping. Temporal patterns in populations of Collembola in wheat were investigated in summer 1987. All species exhibited a diurnal peak in catches on several dates, in contrast to the results of some other studies. Plant-climbing species were identified by sweep net sampling. The efficiencies of different methods for sampling surface-dwelling Collembola were compared and the number of samples needed for accurate sampling determined. The relevance of a correction for spatial variability in pre-treatment insect counts is discussed. The limitations of this and other recent pesticide studies are considered and recommendations for improvements are proposed.
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Published date: 1989
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Local EPrints ID: 461603
URI: http://eprints.soton.ac.uk/id/eprint/461603
PURE UUID: 8a141408-0182-4eb3-a52f-8cdfa1710733
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Date deposited: 04 Jul 2022 18:50
Last modified: 04 Jul 2022 18:50
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Author:
Geoffrey Kenneth Frampton
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