Pesquisa Agropecuária Brasileira (2000) 35, 1281-1288

Dirceu Pratissoli and José Roberto Postali Parra (2000)
Desenvolvimento e exigências térmicas de Trichogramma pretiosum Riley, criados em duas traças do tomateiro
[Development and thermal requirements of Trichogramma pretiosum Riley, rearing in two tomato leafminer]
Pesquisa Agropecuária Brasileira 35 (7), 1281-1288
Abstract: The biology of Trichogramma pretiosum in eggs of Phthorimaea operculella (Zeller) and of Tuta absoluta (Meyrick) were studied under different temperatures (18, 20, 22, 25, 30, 32°C), 70±10% RU and photophase of 14 hours, with the aim of determining the thermal requirements and the number of generations during the year. There was an inverse correlation between the duration of the cycle and the increase of temperature in the thermal zone studied. Nevertheless, the sexual ratio was not affected by the temperature when the host was T. absoluta. The viability of T. pretiosum, reared in P. operculella, was more affected than in T. absoluta. The thermal requirement, calculated by the hyperbole was higher for T. absoluta (131.3 degrees day) in relation to P. operculella (120.9 degrees day), and the thermal threshold was lesser respectively, 12.98°C and 13.53°C. For both species of leafminer, the longevity of parasitoid always obeyed the Weibull's distribution. The increase of the potential was estimated for both species of leafminer, according to the number of annual generations.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Dirceu Pratissoli

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.
	Phthorimaea operculella
	Phthorimaea absoluta
Trichogramma pretiosum (parasitoid)	Phthorimaea operculella
Trichogramma pretiosum (parasitoid)	Phthorimaea absoluta