If you need an accessible version of this item please contact JSTOR User Support

Environmental Factors Affecting Persistence of Entomopathogens

C. M. Ignoffo
The Florida Entomologist
Vol. 75, No. 4 (Dec., 1992), pp. 516-525
DOI: 10.2307/3496133
Stable URL: http://www.jstor.org/stable/3496133
Page Count: 10
  • Download PDF
  • Cite this Item

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support
Environmental Factors Affecting Persistence of Entomopathogens
Preview not available

Abstract

This symposium review will focus on the impact of environmental factors (primarily sunlight, temperature, humidity-water) on the field persistence of selected representative species of entomopathogens (bacteria, fungi, protozoans, viruses). Sunlight is probably the most destructive environmental factor affecting the persistence of entomopathogens and commercial microbial pesticides. Temperatures prevalent in most agro-ecosystems (ca. 10 to 40°C) generally do not adversely affect entomopathogens. Effects at temperature extremes, however, might be obtained when the entomopathogens are stressed by other factors (e.g., light, water, chemicals). The effect of humidity or water on entomopathogens also is difficult to separate from its combination with other environmental factors. Humidity or water per se generally does not directly affect the activity or viability of viral or bacterial entomopathogens respectively. In contrast, lack of moisture reduces the infectivity of many protozoan spores and moisture generally is a primary requirement for germination of conidia and survival of entomopathogenic fungi. /// Esta revision se concentra en el impacto de los factores ambientales (primordialmente luz solar, temperatura, agua-humedad) en la resistencia en el campo de varias especies de entomopatogenos (bacterias, hongos, protozoarios y virus). La luz solar es probablemente el factor mas destructivo del medio ambiente para la persistencia de entomopatogenos y pesticidas comerciales microbiales. Las temperaturas que prevalecen en la mayoria de los agroecosistemas (entre 10 y 40 C) generalmente no afectan adversamente a los entomopatogenos. Los efectos de las temperaturas extremas, sinembargo, pueden afectar cuando los entomopatogenos han sido afectados por otros factores (e.g., luz, agua, quimicos). El efecto de la humedad o agua en los entomopatogenos es algo dificil de separar de su combinacion con otros factores del medio ambiente. La humedad o agua por si solas generalmente no afectan directamente la actividad y viabilidad de entomopatogenos bacteriales y virales, respectivamente. En contraste, la falta de humedad reduce la virulencia de muchas esporas de protozooarios y la humedad generalmente es un requerimiento primordial para la germinacion de las conidias y la sobrevivencia de los hongos entomopatogenos.

Page Thumbnails

  • Thumbnail: Page 
516
    516
  • Thumbnail: Page 
517
    517
  • Thumbnail: Page 
518
    518
  • Thumbnail: Page 
519
    519
  • Thumbnail: Page 
520
    520
  • Thumbnail: Page 
521
    521
  • Thumbnail: Page 
522
    522
  • Thumbnail: Page 
523
    523
  • Thumbnail: Page 
524
    524
  • Thumbnail: Page 
525
    525