The Fungous Disease Caused by <i>Entomophthora grylli</i> Fres., and its Effects on Grasshopper Populations in Saskatchewan in 1963

Pickford, Russell; Riegert, P. W.

doi:10.4039/ent961158-9

Cited by 62 publications

(55 citation statements)

References 6 publications

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“…The shortage in spring rainfall, which usually happens in lowland areas, also contributes to the increase of the population densities of many Orthoptera species whereas drought conditions may negatively affect natural enemies of orthopterans in the field (Mattson and Haack 1987). Fungal outbreaks, for example, require high humidity for spore germination and infection (Pickford and Reigert 1964). However, in the present study some of the common species found in both stations had significantly higher populations in the mountain station.…”

Section: Discussionmentioning

confidence: 88%

Seasonal population fluctuation and spatial distribution of Orthoptera in two grassland areas of Attica – Greece

Antonatos

Εμμανουήλ

Fantinou

et al. 2014

Journal of Natural History

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The aim of this study was to investigate the seasonal population fluctuation of orthopteran assemblages and determine the spatial distribution of the most abundant species of Orthoptera among two habitats in Greece. A 2-year study was performed in a lowland area and in a mountain grassland area. The family of Acrididae represented almost 75% of the total orthopteran relative abundance in both sampling areas. Dociostaurus maroccanus and Chorthippus bornhalmi were found to be the most abundant species in the lowland and the mountain sampling stations, respectively. Most populated species were spatially aggregated in the lowland station, whereas the abundant species were found to be distributed either aggregately or randomly among sampling units in the mountain area. ShannonWiener index estimate was higher for the lowland in 2007 than for the mountain, whereas the opposite was found in 2008. The factors affecting the population dynamics of Orthoptera are discussed.

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Section: Discussionmentioning

confidence: 88%

Seasonal population fluctuation and spatial distribution of Orthoptera in two grassland areas of Attica – Greece

Antonatos

Εμμανουήλ

Fantinou

et al. 2014

Journal of Natural History

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“…For example, the dominant role of infection by Entomophaga grylli (Fres.) in the crash of the extensive outbreak of the clear-winged grasshopper, C. pellucida, in 1963, is well documented (Pickford & Riegert, 1964) and smaller epizootics have occurred since then. More recent observations on the activity of two pathotypes document the increase in the prevalence of infection that is observed following the arrival of above-average rainfall (e.g.…”

Section: Population Reductionsmentioning

confidence: 97%

Reduction of grasshopper populations following field application of the fungusBeauveria bassiana

Johnson¹,

Goettel²

1993

Biocontrol Science and Technology

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Conidia of the Hyphomycete fungus Beauveria bassiana (Bals.) were applied in an attempt to reduce field populations of grasshoppers, primarily the migratory grasshopper Melanoplus sanguinipes (Fabricius). Dry spores were applied with wheat bran carrier to three fallow fields at a rate of 2.0 × 10 13 spores ha -1 in 10 kg bait ha -1 . Examination of culture plates that had been placed in the field to capture spores and of bran carrier with scanning electron microscopy indicated that a substantial portion of the B. bassiana colony-forming units (spores and clumps of spores) did not adhere to the bran and were applied in the field as free particles. Grasshoppers collected from the treated plots at intervals after application were assayed for infection by B. bassiana. The observed rate of mycosis in the treated populations was 70% of those collected after 2 days, declining to 41% by 13 days and 5% by 19 days after application. Analysis of reductions in population density gave results in agreement with the infection data. Treated populations declined 60% and 33% by 9 and 15 days after application respectively. The reductions were significant on both post-treatment sampling dates (p < 0.05) and the three replicated fields gave comparable results. This is the first field demonstration of effectiveness of this fungus as a microbial control agent of grasshoppers.

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“…Many have wide host ranges, infect different ages and stages of their hosts (54,153), and are virulent. (97,135). Hosts with sucking as well as chewing mouthparts are susceptible (34).…”

Section: Fungimentioning

confidence: 99%

Ecological Considerations for the use of Entomopathogens in IPM

Fuxa¹

1987

Annu. Rev. Entomol.

140

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The Fungous Disease Caused by Entomophthora grylli Fres., and its Effects on Grasshopper Populations in Saskatchewan in 1963

Cited by 62 publications

References 6 publications

Seasonal population fluctuation and spatial distribution of Orthoptera in two grassland areas of Attica – Greece

Seasonal population fluctuation and spatial distribution of Orthoptera in two grassland areas of Attica – Greece

Reduction of grasshopper populations following field application of the fungusBeauveria bassiana

Ecological Considerations for the use of Entomopathogens in IPM

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