Neotropical Entomology (2011) 40, 238-243

R.A. Polanczyk, W.F. Barbosa, F.N. Celestino, D. Pratissoli, A.M. Holtz, A.M. Milanez, J.G. Cocheto and A.F. da Silva (2011)
Influência da densidade de ovos de Diaphania hyalinata (L.) (Lepidoptera: Crambidae) na capacidade de parasitismo de Trichogramma exiguum Pinto and Platner e Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae)
[Influence of Diaphania hyalinata (L.) (Lepidoptera: Crambidae) egg density on the parasitization capacity of Trichogramma exiguum Pinto and Platner and Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae)]
Neotropical Entomology 40 (2), 238-243
Abstract: The effects of the egg density of Diaphania hyalinata (L.) on several biological parameters of Trichogramma exiguum Pinto and Platner and T. pretiosum Riley were investigated. For that, 24h-old egg masses were isolated in glass tubes (15 replicates; 1 egg mass = 1 replicate), and offered to parasitization by a newly-emerged female of T. pretiosum or T. exiguum 24h at the proportion of one female to 5, 10, 15, 20, 25, 30, 35 and 40 eggs of D. hyalinata. The following parameters were evaluated: number of parasitized eggs, number of individuals per egg, viability and sex ratio. Trichogramma exiguum parasitized more eggs than T. pretiosum when more than 25 eggs were available per female. The percentage of emergence was satisfactory to T. pretiosum in densities up to 15 eggs/female and up to 20 eggs/female for T. exiguum. The number of individuals per egg was not statistically different in both species except in the density of 25 eggs/female. It can be concluded that T. exiguum performed better than T. pretiosum at larger clutch sizes, as T. exiguum parasitization capacity increased as a result of the size of the host clutch size.
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(original language: Portuguese)
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Database assignments for author(s): Ricardo Antonio Polanczyk, Dirceu Pratissoli

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diaphania hyalinata
Trichogramma pretiosum (parasitoid)	Diaphania hyalinata
Trichogramma exiguum (parasitoid)	Diaphania hyalinata