Revista Colombiana de Entomología (1998) 24, 7-11

María Fernanda Barberena and Anthony C. Bellotti (1998)
Parasitismo de dos razas del nemátodo Heterorhabditis bacteriophora sobre la chinche Cyrtomenus bergi (Hemiptera: Cydnidae) en laboratorio
[Parasitism of two strains of Heterorhabditis bacteriophora on the subterranean burrowing bug Cyrtomenus bergi (Hemiptera: Cydnidae)]
Revista Colombiana de Entomología 24 (1-2), 7-11
Abstract: The subterranean burrowing bug, Cyrtomenus bergi is a pest that damages cassava roots. Its feeding mode facilitates the introduction of root pathogens, deteriorating root quality. The present research, undertaken at the International Center for Tropical Agriculture (ICTA), initiated the development of methodology to mass rear the nematode Heterorhabditis bacteriophora, measured the parasitic capacity of two strains LFR92 and SQC92 on C. bergi, determined the most susceptible development stage; distinguished parasitic comparison between strains, determined if C. bergi responds differentially to several doses of n/ml, and the DL₅₀ for each strain. There were no significant differences in the parasitic capacity between the strains LFR92 and SQC92 of H. bacteriophora. The most susceptible stage of C. bergi to H. bacteriophora parasitism was the fifth nymphal stage for both strains. C. bergi showed a differential response to several doses of n/ml. The DL₅₀ for SQC92 was determined as 826 n/ml with limits [545:1137], and for LFR92 as 720 n/ml, with limits [81:1551]. The strain LFR92 proved to be the more aggressive of the two strains. H. bacteriophora is a potential control agent for C bergi since it has presented high levels of parasitism and because it's a native strain.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Spanish)
Database assignments for author(s): Anthony C. Bellotti

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cyrtomenus bergi	Cassava (Manihot esculenta)
Heterorhabditis bacteriophora/Photorhabdus (entomopathogen)	Cyrtomenus bergi	Cassava (Manihot esculenta)