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Host age selection behaviour of Trichogramma aurosum Sugonjaev & Sorokina (Hymenoptera: Trichogrammatidae)

Samara, R.Y.; Zebitz, C.P.W. and Monje, J.C. (2004) Host age selection behaviour of Trichogramma aurosum Sugonjaev & Sorokina (Hymenoptera: Trichogrammatidae). [Selektion nach Wirtsalter durch Trichogramma aurosum Sugonjaev & Sorokina (Hymenoptera: Trichogrammatidae).] In: Boos, Markus (Ed.) Ecofruit - 11th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing: Proceedings to the Conference from 3rd February to 5th February 2004 at Weinsberg/Germany, pp. 235-239.

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Summary

Host age selection in several German strains of Trichogramma aurosum Sugonjaev & Sorokina was
examined in laboratory choice tests under direct observation for 90 min., in order to select candidate
strains for attempts at controlling the codling moth, Cydia pomonella L. (Lepidoptera: Tortricidae).
Experiments were conducted at room temperature by exposing combinations of two host ages (zero
vs. 4 and 1 vs. 5-day old) to a single female wasp. Host age did not appear to affect the wasps
parasitization behaviour, although they spent longer time drilling on old eggs (4 and 5 days old)
compared with fresh ones (0 and 1 day old). This not necessarily means that they preferred fresh
eggs over old ones, since both type of hosts were parasitized in the choice test. Possibly an increased
mechanical resistance of the chorion of older eggs was responsible for the prolonged drilling
time. Mean drumming time was independent of host age. Mean duration of drilling and drumming
was in general longest in the first and last egg attacked by all T. aurosum strains tested and
for all host ages. Drilling time consumed more than 80% of the mean handling time of all strains
tested for all host ages, followed by resting and walking.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Trichogramma aurosum, egg parasitoids, host age, choice test, host selection, parasitization behaviour, Cydia pomonella, codling moth.
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Fruit and berries
Research affiliation: International Conferences > 2006: Ecofruit
Related Links:http://www.ecofruit.net
Deposited By: Tagung, Ecofruit
ID Code:14547
Deposited On:18 Sep 2008
Last Modified:12 Apr 2010 07:38
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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