Effect of host availability and egg load in Trichogramma platneri Nagarkatti (Hymenoptera: Trichogrammatidae) and its consequences on progeny quality

Hohmann, C. L.; Luck, Robert F.

doi:10.1590/s1516-89132004000300012

Cited by 20 publications

(12 citation statements)

References 26 publications

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“…1), but did not differ in the number of eggs deposited per larva (Table 1), which are correlated biological parameters. At the lowest density, possibly, this event is the result of a female strategy to avoid superparasitism, as this could affect the development of the offspring due to intraspecific competition for food resources (Hohmann and Luck 2004;Varaldi et al 2005;Chen et al 2006;Silva-Torres et al 2009b). Females of B. vulgaris, after evaluating the physiological condition of the host larva, may reduce the number of eggs deposited per host (2.6 ± 0.49 eggs/48 h), similar to that reported by Carvalho et al (2002) who found an average of 1.2 (± 0.21) eggs/for B.vulgaris parasitizing boll weevil larvae.…”

Section: Discussionmentioning

confidence: 99%

Behavioral Studies of the Parasitoid Bracon vulgaris Ashmead (Hymenoptera: Braconidae)

et al. 2015

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Bracon vulgaris is a larval ectoparasitoid of the boll weevil, Anthonomus grandis, a key cotton pest We investigated the influence of parasitoid age, photoperiod and host availability on B. vulgaris parasitism. Five-and 10-day-old parasitoids were exposed to A. grandis densities of three, six, 12 and 24 larvae per female. Five-day-old females showed higher parasitism rates (F = 21.55, P < 0.0001), with a positive increase in parasitism rate up to 12 larvae, parasitizing an average (±SE) of 1.3 (±0.12), 3.4 (±0.35) and 4.4 (±0.45) larvae (at the densities of 3, 6 and 12 larvae, respectively), dropping to 1.4 (±0.17) when 24 larvae were offered. Next, the period of most parasitism activity during the photophase was determined by exposing five-dayold B. vulgaris females to different durations of light exposure (1, 3, 6, 8 and 10 h) after 12 h darkness. Results showed that the shortest time to host location occurred 8 h after light exposure, when parasitoids were most active searching for the host. A sequence of seven behavioral acts leading to successful parasitism was identified and the transitions between successive behavioral acts were quantified and depicted in an ethogram. The longest duration act was oviposition (or host acceptance), a complex behavior with several distinct phases.

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Section: Discussionmentioning

confidence: 99%

Behavioral Studies of the Parasitoid Bracon vulgaris Ashmead (Hymenoptera: Braconidae)

et al. 2015

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“…atopovirilia necessita de carboidratos e a ausência de alimento interfere na longevidade e fecundidade desse parasitóide. O período sem o hospedeiro também interfere na capacidade reprodutiva desse parasitóide, pois, à medida que as fêmeas ficam sem receber ovos do hospedeiro aumenta a taxa de retenção dos ovos nas fêmeas (Hegazi et al, 2000, Reznik et al, 2001) e afetam a qualidade de sua progênie (Hohmann & Luck, 2004).…”

Section: Discussionunclassified

Privação De Hospedeiro E Alimentação Sobre as Características Reprodutivas De Trichogramma Atopovirilia (Hymenoptera: Trichogrammatidae)

Vianna

Pratissoli

Zanúncio³

et al. 2010

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Comparou-se o efeito de diferentes períodos de tempo sem hospedeiro nas características reprodutivas de Trichogramma atopovirilia (Hymenoptera: Trichogrammatidae) alimentados ou não. Ovos de Anagasta kuehniella (Lepidoptera: Pyralidae) e Sitotroga cerealella (Lepidoptera: Gelechiidae) foram utilizados como hospedeiros, sendo expostos a fêmeas desse parasitóide após 0, 6, 12, 24, 36, 48, 60, 72, 84 ou 96 horas. Fêmeas de T. atopovirilia, alimentadas parasitaram ovos dos hospedeiros até 96 horas sem os mesmos. No entanto, o parasitismo ocorreu até o período de 24 horas em A. kuehniella e 48 horas com S. cerealella quando não alimentados. O parasitismo, a emergência e a razão sexual de T. atopovirilia foram semelhantes em ovos de A. kuehniella, mas com o aumento do período sem esse hospedeiro, decresce ao longo do tempo, com S. cerealella de forma semelhante foi observado para aquelas não alimentadas. O alimento foi o principal fator que afetou no parasitismo de T. atopovirilia.

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“…Estudos com diferentes insetos têm mostrado que organismos que investem mais em reprodução podem ter redução na longevidade como resultado de um balanço energético entre reprodução e sobrevivência (Reznick 1985, Bell & Koufopanou 1986, Stearns 1992. Apesar de existir pouca evidência da existência desse balanço em Hymenoptera Parasitica, Hohmann & Luck (2004) (Liu et al 1997), diferentemente da linhagem do Agreste de Pernambuco, que não deve apresentar quiescência devido à baixa variabilidade das condições climáticas durante o ano, e também pelo fato de ser constatado parasitismo de P. xylostella em todas as estações, indicando possíveis diferenças de estratégia de vida entre linhagens.…”

Section: Discussionunclassified

“…O fator que determina a eficiência de um parasitóide está intimamente ligado à sua capacidade de encontrar o hospedeiro em campo, manipular o número de ovos a serem depositados por hospedeiro e sua sobrevivência, em resposta à disponibilidade de hospedeiros. Nessas condições, o estado fisiológico do parasitóide tem implicações importantes para seu sucesso reprodutivo (Hohmann & Luck 2004).…”

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Efeito da idade, fotoperíodo e disponibilidade de hospedeiro no comportamento de parasitismo de Oomyzus sokolowskii Kurdjumov (Hymenoptera: Eulophidae)

Silva-Torres¹,

Barros²,

Torres³

2009

Neotrop. entomol.

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-The high reproduction rate, potential to cause damage, wide geographic distribution and resistance to insecticides of Plutella xylostella (L.) makes difficult its efficient control. However, larvae and pupae of this pest are naturally parasitized by Oomyzus sokolowskii (Kurdjumov), providing opportunities to improve the natural parasitism. This study investigated the effects of the age of adult parasitoids, host availability and time of exposure on O. sokolowskii parasitism behavior. The number of larvae encounters by parasitoid females and the parasitism rate increased with parasitoid age up to 96h. The parasitization was higher when wasps received a constant number of hosts daily in comparison with a random number (13.3 versus 8.9 larvae parasitized). Female parasitization activity was maintained up to the age of 20 days in both treatments and exhibited similar longevity (constant host = 33.5 d; and random host = 34.7 d). The progeny produced per female and the number of parasitoids emerged per host significantly decreased as wasps aged. There was no significant effect of the light regime (12h darkness or 12h light exposure) on the parasitization, although parasitoid was more active after 3h of light exposure. Therefore, further studies on field application of O. sokolowskii should consider the release of 48h-to 72h-old parasitoids at dawn as a way to increase the success of host parasitization.

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Effect of host availability and egg load in Trichogramma platneri Nagarkatti (Hymenoptera: Trichogrammatidae) and its consequences on progeny quality

Abstract: Experiments were conducted to determine whether

Cited by 20 publications

References 26 publications

Behavioral Studies of the Parasitoid Bracon vulgaris Ashmead (Hymenoptera: Braconidae)

Behavioral Studies of the Parasitoid Bracon vulgaris Ashmead (Hymenoptera: Braconidae)

Privação De Hospedeiro E Alimentação Sobre as Características Reprodutivas De Trichogramma Atopovirilia (Hymenoptera: Trichogrammatidae)

Efeito da idade, fotoperíodo e disponibilidade de hospedeiro no comportamento de parasitismo de Oomyzus sokolowskii Kurdjumov (Hymenoptera: Eulophidae)

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