ISSN:
1570-7458
Keywords:
Trichogramma brassicae
;
Hymenoptera
;
Trichogrammatidae
;
mass rearing
;
quality control
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The quality of 52 populations of the egg-parasitoidTrichogramma brassicae Bezdenko (Hymenoptera, Trichogrammatidae) (synonymous toT. maidis Pint. et Voegele) has been compared by investigating seven parameters in each population. The parameters assessed were: emergence rate, sex ratio, ratio of deformed females, life-span, walking activity, fecundity on the factitious host eggs and fecundity on the natural host eggs. The last parameter is used as an indirect measure of the acceptance and suitability of the natural host eggs. Origin, history and treatment of each population were known and used as information for interpreting the quality. For computing and presenting the data classical descriptive statistics as well as graphical methods (profile symbol) were applied. Principal Component Analysis and cluster analysis were used for dividing the populations into groups with similar properties. From the results we conclude: a) Strains of the same species, reared under similar conditions, differ in quality. b) Storage and shipment often have a negative impact on quality. c) Crossbred isolated populations showed a lower quality than the parental populations. A synoptical presentation of many parameters assessed on a high number of populations (strains, biotypes, species) is best accomplished by combining profile symbol plots, Principal Component Analysis and cluster analysis.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02382775
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