Prevalence of Neozygites fresenii (Entomophthorales: Neozygitaceae) on cotton aphids (Homoptera: Aphididae) in Arkansas cotton

This is the first area-wide multiyear survey for prevalence rates of Neozygites fresenii (Nowakowski) Batko, an important natural enemy of the cotton aphid, Aphis gossypii Glover. In both 1992 and 1993, N. fresenii occurred throughout a wide geographical area in Arkansas and along the Mississippi Ri...

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Bibliographic Details
Published inEnvironmental entomology Vol. 24; no. 2
Main Authors Steinkraus, D.C. (University of Arkansas, Fayetteville, AR.), Hollingswoth, R.G, Slaymaker, P.H
Format Journal Article
LanguageEnglish
Published 01.04.1995
Subjects
APHIS GOSSYPII
ARKANSAS
CONTROL BIOLOGICO
CONTROL DE INSECTOS
ENEMIGOS NATURALES
ENNEMI NATUREL
GOSSYPIUM
GOSSYPIUM HIRSUTUM
LOUISIANE
LUISIANA
LUTTE ANTIINSECTE
LUTTE BIOLOGIQUE
MISSISSIPPI
NEOZYGITES
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Summary:This is the first area-wide multiyear survey for prevalence rates of Neozygites fresenii (Nowakowski) Batko, an important natural enemy of the cotton aphid, Aphis gossypii Glover. In both 1992 and 1993, N. fresenii occurred throughout a wide geographical area in Arkansas and along the Mississippi River flood plain and showed a significant trend for a decrease in prevalence rates from south to north in both years. In 1992, N. fresenii was present in A. gossypii populations in 87.5% (n = 24) of aphid-infested commercial cotton fields. Prevalence rates in 1992 (sampled on 23 and 29 July) ranged from 0 to 100% with a mean prevalence rate of 50.1%. In 1993 (sampled on 7 and 8 July), N. fresenii was present in 77.8% (n = 18) of aphid-infested commercial cotton fields and prevalence rates ranged from 0 to 57% with a mean of 13.7%. Prevalence of N. fresenii was periodically determined to study the development of epizootics in 1991 (one research field), 1992 (three commercial cotton fields and one research field), and 1993 (four commercial cotton fields and one research field) in Arkansas. Epizootics occurred in all 10 fields and generally caused A. gossypii populations to decline rapidly. N. fresenii infected alatae were observed approximately 2 wk earlier than the first infected apterae. Migrating infected alatae may be a mechanism by which N. fresenii is spread within and between fields and may also serve as an early indication of impending epizootics. Infected apterae may also be useful indicators of imminent epizootics because A. gossypii populations generally declined 1-3 wks after N. fresenii was first detected in apterae
Bibliography:H10
9548687
ISSN:0046-225X
1938-2936
DOI:10.1093/ee/24.2.465