Journal of Entomological Science (2006) 41, 22-32

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Orville G. Marti and D.M. Olson (2006)
Neozygites fresenii (Entomophthorales: Neozygitaceae) prevalence in Aphis gossypii (Homoptera: Aphididae) in three south central Georgia cotton fields
Journal of Entomological Science 41 (1), 22-32
Abstract: The presence of cotton aphids, Aphis gossypii Glover, and the incidence of its fungal pathogen, Neozygites fresenii (Nowakowski) Batko, were monitored with pan traps, plant sampling, and sticky traps in three south central Georgia cotton fields in the early part of the 2002 growing season. Aphids were trapped in low numbers (<10/trap/sampling date) in fields 1 and 2 until 17 June when the aphid population increased to >60/trap/sampling date. A similar increase was observed in field 3 after 21 June. Differences observed in the three fields were attributed to differences in planting date. Aphids in sticky traps were counted but not examined for pathogenic fungi. Aphids were detected in pan traps as early as 4 May, but all were negative for N. fresenii until 10 June, after which the mean incidence of the fungus increased rapidly to a peak of >60% by 27 June. The aphid population as determined by plant sampling increased logarithmically between 3 June and 8 July, whereas the increase in incidence of N. fresenii was exponential, with all of the observed increase occurring after 10 June. Multiple generations of the fungus developed between its first detection in aphids in mid-June to the peak of the epizootic on or after 8 July.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Orville G. Marti, Dawn M. Olson

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
population dynamics/ epidemiology
Research topic(s) for beneficials or antagonists:
population dynamics/epizootiology

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Aphis gossypii Cotton (Gossypium) U.S.A. (SE)
Neozygites fresenii (entomopathogen) Aphis gossypii Cotton (Gossypium) U.S.A. (SE)