Neotropical Entomology (2007) 36, 431-435

Ricardo L. Melo, Dirceu Pratissoli, Ricardo A. Polanczyk, Débora F. Melo, Reginaldo Barros and André M. Milanez (2007)
Biologia e exigências térmicas de Trichogramma atopovirilia Oatman and Platner (Hymenoptera: Trichogrammatidae) em ovos de Diaphania hyalinata L. (Lepidoptera: Pyralidae)
[Biology and thermal requirements of Trichogramma atopovirilia Oatman and Platner (Hymenoptera: Trichogrammatidae) parasitizing eggs of Diaphania hyalinata L. (Lepidoptera: Pyralidae)]
Neotropical Entomology 36 (3), 431-435
Abstract: The development and parasitism of Diaphania hyalinata L. eggs by Trichogramma atopovirilia Oatmanand Platner and its thermal requirements were studied at the temperatures of 18, 21, 24, 27, 30 and 33°C. Thirty eggs of D. hyalinata were exposed to three females of T. atopovirilia for 5h at 25°C and incubated at the different temperatures. The developmental time from egg exposure to adult, parasitism viability, number of adults per parasitized host egg and progeny sex ratio were monitored. The developmental time from egg to adult emergence of the parasitoid exhibited inverse relationship to the temperature, lasting 24.12 days at 18°C and 7.36 days at 33°C. Parasitism viability at 24, 27 and 30°C was higher than 90%. The ratio of T. atapovirilia adult produced per egg and its sex ratio were not affected when using D. hialynata as host. The lowest threshold temperature (Tb) and estimated degree-days over Tb required by T. atopovirilia to develop on eggs of D. hyalinata was 11.99°C and 130.42ºC, respectively. Considering the temperature regimes of two areas where cucurbitaces are cultivated in Bahia State (Rio Real and Inhambupe County) it was estimated that T. atopovirilia can achieve more than 32 generation per year. The results suggest that T. atopovirilia has potential to control D. hyalinata eggs with better chance of success under temperature regimes ranging from 24 to 27°C that meets the suitable field conditions for cropping cucurbitaces.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): Dirceu Pratissoli, Ricardo Antonio Polanczyk

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
environment/habitat manipulation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diaphania hyalinata		Brazil (south)
	Diaphania hyalinata		Brazil (NE)
Trichogramma atopovirilia (parasitoid)	Diaphania hyalinata		Brazil (south)
Trichogramma atopovirilia (parasitoid)	Diaphania hyalinata		Brazil (NE)