Comparative Pesticide Effects on
Entomophthora
and the Phytopathogen

Alternaria solani
2

Soper, Richard S.; Holbrook, F. R.; Gordon, Corinne C.

doi:10.1093/ee/3.3.560

Cited by 17 publications

(6 citation statements)

References 0 publications

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“…Laboratory investigations have consistently demonstrated that agricultural fungicides diminish in vitro growth, germination of conidia, and infection of arthropods by pathogenic fungi (Hall & Dunn, 1959;Soper et al, 1974;Delorme & Fritz, 1978;Zimmermann, 1978;Zimmermann & Baselow, 1980;Carruthers, 1982). However, there have been few field experiments that have tested the effect of fungicides on entomogenous fungi, and the results of such experiments are contradictory.…”

Section: Discussionmentioning

confidence: 99%

Role of the entomogenous fungus, Neozygites floridana, in population declines of the twospotted spider mite, Tetranychus urticae, on field corn

Smitley

Kennedy

Brooks

1986

Entomologia Exp Applicata

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In field plots in which populations of predaceous species were suppressed using carbaryl, populations of the twospotted spider mite, Tetranychus urticae Koch, on field corn declined in association with aerial dispersal of the mites or with epizootics of the entomogenous fungus, Neozygites floridana Weiser & Muma. The relative importance of these two factors varied from year to year depending on environmental conditions. When moist weather conditions induced epizootics of N. floridana before corn plants became heavily infested with mites, the pathogen appeared to be the major factor causing mite population declines. When dry weather conditions allowed mite populations to expand unchecked until corn plants became entirely infested, mite aerial dispersal was the major factor associated with mite population declines. In every field in which there was an epizootic of N. floridana, routine applications of the fungicide maneb delayed epizootics and reduced or delayed the impact of the pathogen on mite populations. The total number of Neozygites-infected mites produced in maneb-treated plots throughout the test period was significantly greater than that in untreated plots when epizootics were initiated during periods of mite population growth. Fewer total infected mites were produced in maneb-treated plots compared to untreated plots when epizootics were initiated during periods of mite population decline.

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Section: Discussionmentioning

confidence: 99%

Role of the entomogenous fungus, Neozygites floridana, in population declines of the twospotted spider mite, Tetranychus urticae, on field corn

Smitley

Kennedy

Brooks

1986

Entomologia Exp Applicata

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“…Aucune r~gle ne permet d'extrapoler les r6sultats obtenus aux autres esp~ces d'Entomophthorales. D6j~t plusieurs auteurs ont constat6 une disparit6 dans l'action de fongicides et &insecticides sur la croissance myc61ienne de diverses esp6ces du genre Entomophthora (HALL & DUNN, 1959;SOPER et al, 1974). I1 s'av~re doric indispensable d'&udier syst6matiquement les effets de tousles fongicides, susceptibles de pr6senter un danger sur les principales souches responsables des mycoses Entomophthorales.…”

Section: Resultsunclassified

Action de quelques fongicides sur la croissance mycélienne de trois espèces d'Entomophthorales

Fritz¹

1976

Entomophaga

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“…Hall (I 981 ) observed a difference in susceptibility of 2 strains of Verticillium lecanii (Zimmermann) Viegas (Deuterornycetes) to malathion. Carbaryl, malathion, and several different organophosphate compounds have been shown to inhibit growth of several species of Entornophthorales in culture (Hall & Dunn, 1959 ;Soper et al, 1974).…”

Section: Discussionmentioning

confidence: 99%

Insecticide effects onEntomophthora muscae [Zygomycetes: Entomophthorales]

Mullens

Rodriguez

1986

Entomophaga

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Studies were conducted to determine the effect of insecticide residues on germination of primary conidia of Entomophthora muscae (Cob.n) Fresenius and to determine the relative susceptibility of h~althy and infected Musca domestica L. to insecticides. Primary conidia were discharged from M. domestica cadavers onto glass microscope slides treated with insecticides. All insecticides significantly inhibited germination relative to control slides. Permethrin and haled had the least inhibition (36-40 96 ), while malathion and dimethoate almost completely inhibited germination (87-94 % ). Tetrachlorvinphos/dichlorvos and carbaryl were intermediate (57-59 %). Healthy flies were not significantly different from infected flies in terms of susceptibility to haled, dimethoate, or permethrin. Infected flies exposed on the last day of pathogen incubation died on the bottom of the Petri dishes, rather than climbing and attaching as did untreated, infected flies. Both control and treated groups produced large numbers of primary conidia.

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Comparative Pesticide Effects on Entomophthora and the Phytopathogen Alternaria solani 2

Cited by 17 publications

References 0 publications

Role of the entomogenous fungus, Neozygites floridana, in population declines of the twospotted spider mite, Tetranychus urticae, on field corn

Role of the entomogenous fungus, Neozygites floridana, in population declines of the twospotted spider mite, Tetranychus urticae, on field corn

Action de quelques fongicides sur la croissance mycélienne de trois espèces d'Entomophthorales

Insecticide effects onEntomophthora muscae [Zygomycetes: Entomophthorales]

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