Étude de l'évolution d'une mycose aNeozygites fumosa [Zygomycetes, Entomophthorales] dans une population de la cochenille du manioc,Phenacoccus manihoti [Hom.: Pseudococcidae]

  title={{\'E}tude de l'{\'e}volution d'une mycose aNeozygites fumosa [Zygomycetes, Entomophthorales] dans une population de la cochenille du manioc,Phenacoccus manihoti [Hom.: Pseudococcidae]},
  author={Bruno Le R{\"u}},
  • B. Rü
  • Published 1 March 1986
  • Biology
  • Entomophaga
RésuméL'action régulatrice d'un champignon du groupe des Entomophthorales,Neozygites fumosa (Speare) Remaudière et Keller, est mise en évidence pour la lère fois dans une population de la cochenille du maniocPhenacoccus manihoti Matile-Ferrero (Homoptères: Pseudococcidae) en République Populaire du Congo en 1982. Le pathogène est de loin l'ennemi naturel qui intervient le plus significativement dans la régulation des effectifs. L'extension de la maladie dans la population hôte apparaît… 

Nouvelles données sur le déroulement de la mycose àNeozygites fumosa sur la cochenille du maniocPhenacoccus manihoti

Results obtained in the Congo in 1987 are given on previously unstudied aspects of the epizootiology of Neozygites fumosa (Speare) Remaudière et Keller (Entomophthorales), a pathogen of the cassava mealybug, Phenacoccus manihoti Matile-Ferrero (Hom.: Pseudococcidae).

Étude de la consommation alimentaire d'Hyperaspis raynevali [Col.: coccinellidae] Prédateur de la cochenille farineuse du maniocPhenacoccus manihoti [Hom.: pseudococcidae]

Results show that nutritional quality of P. manihoti is slightly better compared withP.

Variations d'abondance et facteurs de régulation de la Cochenille du maniocPhenacoccus manihoti [Hom.: Pseudococcidae] cinq ans après l'introduction d'Epidinocarsis lopezi [Hym.: Encyrtidae] parasitoïde néotropical au Congo en 1982

A detailed study in the Congo of the population dynamics and of the regulating factors of the cassava mealybugPhenacoccus manihoti five years after the introduction of the exotic parasitoidEpidinocarsis lopezi reveals the persistance of the outbreaks of this pest for the last nine years.

Importance of ambient saturation deficits in an epizootic of the fungus Neozygites floridana in cassava green mites (Mononychellus tanajoa)

Night-time saturation did help to explain the variation in transmission from infective cadavers to newly killed hosts, and supports laboratory observations that horizontal transmission between hosts is determined mainly by saturation deficits, while the process of infection is little affected by abiotic conditions.

Laboratory evaluation of the effectiveness of the entomopathogen; Isaria farinosa, on citrus mealybug, Planococcus citri

The results demonstrated that the effectiveness of the entomopathogen is promising for biocontrol of citrus mealybug.

Insect-associated fungi from naturally mycosed vine mealybug Planococcus ficus (Signoret) (Hemiptera: Pseudococcidae)

New insights are provided into the development of mycoinsecticides and conservation biocontrol strategies for P. ficus pest management and the first isolations of EPF from vine mealybug worldwide are reported.

Novel Approaches for the Management of Mealybug Pests

This estimate was recently revised in light of integrated molecular and morphological data, and only two subfamilies emerged: Pseudococcinae and Phenacoccinee (Hardy et al. 2008).

Emerging pests and diseases of South-east Asian cassava: a comprehensive evaluation of geographic priorities, management options and research needs.

Although all main pests and diseases are non-natives, it is hypothesise that accelerating intensification of cropping systems, increased climate change and variability, and deficient crop husbandry are aggravating both organism activity and crop susceptibility.

Methods of Control

Since the mealybugs are the most invasive species, classical biological control has been frequently employed against them.

Natural Enemies of Mealybugs

The outbreak of mealybugs was observed in many instances with the application of broad-spectrum insecticides, which might have disturbed the activity of natural enemies particularly parasitoids and predators, thereby regulating the mealybug population.



Facteurs de limitation des populations d'Aphis fabae dans l'ouest de la France III. Répartition et incidence des différentes espèces d'Entomophthora dans les populations

Although Entomophthora aphidisHoffman occurs every year, this species was the most efficient pathogen in 1973 only, and E. fresenii is the main pathogen of A. fabae in the West of France 3 years over 4.5 years.

L'entomophthoraleNeozygites fumosa pathogène de la Cochenille du manioc,Phenacoccus manihoti [Hom.: Pseudococcidae], en République populaire du Congo

The entomophthoraceous fungus, Neozygites fumosa (Speare) Remaudière and Keller, which was only known from the south of the U.S.A., was found in the People's Republic of the Congo, on the Cassava mealybug,henacoccus manihoti Matile-Ferrero [Homoptera: Coccoidea, Pseudococcidae].

Circonstances épidémiologiques semblant favoriser le développement des mycoses a entomophthorales chez trois aphides,Aphis fabaeScop.,Capitophorus horniBôrnerEt myzus persicae (Sulz.)

The results suggest a possibility of aphid control by appropriate irrigation programmes byappropriate irrigation programmes in western France.

Relationships between cassava root yields and crop infestations by the mealybug, Phenacoccus manihoti

Abstract Reductions in cassava root yield were related to infestations of the crop by the cassava mealybug, Phenacoccus manihoti Mat.‐Ferr. in field trials that combined several varieties, dates of