Neotropical Entomology (2001) 30, 731-733

Régis S.S. Santos, Liuza R. Redaelli and Lúcia M.G. Diefenbach (2001)
Ocorrência de Parasitismo em Ovos de Spartocera dentiventris (Berg) (Hemiptera: Coreidae) em Cultura de Fumo
[Egg parasitism of Spartocera dentiventris (Berg) (Hemiptera: Coreidae) in tobacco crop]
Neotropical Entomology 30 (4), 731-733
Abstract: The paucity of information about egg parasitoids of Spartocera dentiventris (Berg) motivated the present work. This study aimed to determine the parasitoid species involved as well as to quantify the mortality caused by these natural enemies in field conditions. The investigation was carried out in a tobacco crop (cultivar Virgínia, var. K-326) in Porto Alegre, RS. From December/97 to February/98, 20 egg masses of known age were left exposed to all causes of mortality for a period of 13 days. Two species of parasitoids were found on eggs of S. dentiventris: Gryon gallardoi (Brethes) (Hym.: Scelionidae) and Neorileya ashmeadi Crawford (Hym.: Eurytomidae). From a total of 321 observed eggs, only 34.3% (110 eggs) originated nymphs of S. dentiventris. Parasitism was the main mortality factor, killing 148 eggs (46.1%) from the total observed.

A escassez de trabalhos a respeito de parasitóides de ovos de Spartocera dentiventris (Berg) motivou o presente estudo, que teve como objetivo registrar a existência de parasitóides de ovos deste coreídeo, bem como quantificar a mortalidade ocasionada por esses agentes em condições de campo. O estudo foi conduzido numa lavoura de fumo (cv. Virgínia, var. K-326) no município de Porto Alegre, RS. No período de dez/97 a fev/98, 20 posturas de S. dentiventris, de idade conhecida, permaneceram expostas a todas as causas de mortalidade por 13 dias. Constatou-se a ocorrência de duas espécies de parasitóides nos ovos de S. dentiventris: Gryon gallardoi (Brethes) (Hym.: Scelionidae) e Neorileya ashmeadi Crawford (Hym.: Eurytomidae). Do total de ovos observados (321) apenas 34,3% (110 ovos) geraram ninfas do percevejo-cinzento-do-fumo. O parasitismo foi o principal fator de mortalidade atingindo 148 ovos (46,1%) do total observado.
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(original language: Portuguese)
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Database assignments for author(s): Luiza R. Redaelli

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Spartocera dentiventris	Tobacco (Nicotiana tabacum)	Brazil (south)
Hadronotus gallardoi (parasitoid)	Spartocera dentiventris	Tobacco (Nicotiana tabacum)	Brazil (south)
Neorileya ashmeadi (parasitoid)	Spartocera dentiventris	Tobacco (Nicotiana tabacum)	Brazil (south)