Cinetica da Esporulacao e Viabilidade de Conidios de Nomuraea rileyi (Farlow) Samson sobre Cadaveres la Lagarta-da-Soja, Anticarsia gemmatalis Hubner (Lepidoptera: Noctuidae), em Condicoes de Campo

The entomopathogenic fungus Nomuraea rileyi (Farlow) Samson produces epizootics on populations of the velvetbean caterpillar, Anticarsia gemmatalis H bner, resulting in its natural control. However, sometimes this phenomenon does not occur soon enough to prevent pest population outbreaks and damage...

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Bibliographic Details
Published inNeotropical entomology Vol. 31; no. 1; pp. 85 - 90
Main Authors Sujii, E.R, Carvalho, V.A, Tigano, M.S
Format Journal Article
LanguagePortuguese
Published 2002
Subjects
Anticarsia gemmatalis
biological control
conidia
entomopathogenic fungi
field experimentation
Glycine max
insect pests
kinetics
larvae
Nomuraea rileyi
pathogenicity
precipitation
relative humidity
soybeans
sporulation
viability
Brazil
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Summary:The entomopathogenic fungus Nomuraea rileyi (Farlow) Samson produces epizootics on populations of the velvetbean caterpillar, Anticarsia gemmatalis H bner, resulting in its natural control. However, sometimes this phenomenon does not occur soon enough to prevent pest population outbreaks and damage to the crop. Observations of N. rileyi conidial production on the surface of A. gemmatalis cadavers in the field showed that high relative humidity and precipitation determine the sporulation dynamics. In fact, initiation of sporulation is delayed and conidia production is reduced when A. gemmatalis cadavers infected with N. rileyi are exposed to water stress (relative humidity 25-30%) in the laboratory. Field observations also demonstrated that N. rileyi conidial viability remain high (>75% germination) until 10 days on A. gemmatalis cadaver surface, acting as an inoculum source for this period.
ISSN:1519-566X
1678-8052