Influence of Fungicides on Development of an Entomopathogenic Fungus (Zygomycetes: Neozygitaceae) in the Cotton Aphid (Homoptera: Aphididae)

Autor:	Michael T. Smith, D. D. Hardee
Rok vydání:	1996
Předmět:	education.field_of_study Aphid Ecology Homoptera Population Aphididae Biology biology.organism_classification Fungicide Horticulture chemistry.chemical_compound chemistry Insect Science Aphis gossypii Entomopathogenic fungus Botany education Metalaxyl Ecology Evolution Behavior and Systematics
Zdroj:	Environmental Entomology. 25:677-687
ISSN:	1938-2936 0046-225X
DOI:	10.1093/ee/25.3.677
Popis:	Fungicides used commercially for control of cotton seedling diseases were evaluated under field conditions during a 3-yr period for their effects on the prevalence of the entomopathogenic fungus Neozygites fresenii (Nowakowski) Batko in the cotton aphid, Aphis gossypii Glover. The susceptibility of N. fresenii to the fungicides varied. Carboxin significantly reduced N. fresenii prevalence during the early season. Furthermore, A. gossypii population levels were significantly greater during the 1993 field test in plots treated with carboxin. In some cases etridiazole and metalaxyl also significantly reduced N. fresenii prevalence during the early season. Conversely, N. fresenii prevalence was generally equivalent to or greater in the fungicide-treated plots than in the control plots during the late season. Although numerous biotic and abiotic factors (that is, environmental or artificial or both) also influence fungal prevalence in field situations, this appears to be the 1st demonstration of reduced entomopathogenic fungal prevalence caused by the application of a granular fungicide at planting. Biological and cultural implications are discussed.
Databáze:	OpenAIRE
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