Efeito de genótipos de milho no parasitismo por Trichogramma spp. em ovos de Helicoverpa zea (Boddie)

Paron, Maria J. F. O.; Cruz, Ivan; Ciociola, Américo I.

doi:10.1590/s0301-80591998000300012

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…For earwig nymphs, the presence/absence on the plants was considered, regardless the number of insects. Parasitism by Trichogramma was assessed through observation of parasitized Helicoperva zea (Boddie) eggs as suggested by Paron et al (1998).…”

Section: Methodsmentioning

confidence: 99%

Short-term assessment of bt maize on non-target arthropods in Brazil

Faria

Martinelli²,

Schmidt

et al. 2007

Sci. agric. (Piracicaba, Braz.)

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ABSTRACT:Although not yet available for cultivation in Brazil, the effect of Bt maize hybrids on natural enemies and soil dwelling arthropods should be assessed prior to its release to growers. Trials were carried out during one growing season in two different locations with the genetically modified maize hybrids 7590-Bt11 and Avant-ICP4, comparing with their respective non-Bt isogenic hybrids. Arthropods were evaluated through direct observation on plants and pitfall traps. In general, no differences were observed between populations of earwig (Dermaptera: Forficulidae), lady beetles (Coleptera: Coccinellidae), minute pirate bug (Coleoptera: Anthocoridae), ground beetles (Carabidae), tiger beetles (Cicindelidae), and spiders (Araneae). There was no difference in egg parasitism of Helicoverpa zea (Boddie) by Trichogramma sp. (Hymenoptera: Trichogrammatidae). Thus, Bt maize hybrids expressing insecticide proteins Cry1A(b) and VIP 3A do not cause reduction of the main maize dweeling predators and parasitoids.

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Section: Methodsmentioning

confidence: 99%

Short-term assessment of bt maize on non-target arthropods in Brazil

Faria

Martinelli²,

Schmidt

et al. 2007

Sci. agric. (Piracicaba, Braz.)

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show abstract

“…In the south‐east of Brazil, natural parasitism levels of H . zea by Trichogramma pretiosum Riley and Trichogramma atopovirilia Oatman and Platner have ranged between 60 and 90% (P aron et al., 1998; S á and P arra , 1994). In the complex of important insect predators of eggs and of small larvae, the heteropteran Orius sp.…”

Section: Introductionmentioning

confidence: 99%

“…According to Oatman (1966) and Vargas and Nishida (1980), egg parasitoids of the genus Trichogramma act as the major mortality factor of H. zea in corn. In the south-east of Brazil, natural parasitism levels of H. zea by Trichogramma pretiosum Riley and Trichogramma atopovirilia Oatman and Platner have ranged between 60 and 90% (Paron et al, 1998;Sá and Parra, 1994). In the complex of important insect predators of eggs and of small larvae, the heteropteran Orius sp.…”

Section: Introductionmentioning

confidence: 99%

Chlorpyrifos spraying of no‐tillage corn during tasselling and its effect on damage by Helicoverpa zea (Lep., Noctuidae) and on its natural enemies

Filho¹,

Lúcia²,

Cruz³

et al. 2002

J Applied Entomology

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Corn plants were twice sprayed at 3‐day intervals during tasselling to evaluate the effect of chlorpyrifos on ear damage by H. zea and also on the populations of the natural enemies associated with this moth. The abundance of H. zea eggs and larvae and of predators on the whole plant, the egg parasitism by Trichogramma pretiosum Riley and the percentage of injured ears were sampled weekly. Chlorpyrifos did not show any significant effect on population levels and on ear damage by H. zea. Natural parasitism of eggs ranged from 52 to 75% and did not differ between treated and untreated plots; furthermore, the percentage of non viable eggs and adult emergence were not influenced by insecticide application. Among the predators found in the plots, Doru luteipes was not affected by spraying, whereas the abundance of Orius sp. decreased 21 days after insecticide application. The frequency of the ant Pheidole sp. was not affected by chlorpyrifos; however, foraging activity of Crematogaster sp. on treated plots was rapidly reduced and remained low during the following 2 weeks. The small number of damaged ears suggests that the insecticide did not affect the efficiency of the natural enemies of H. zea.

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“…Dentre as espécies coletadas, Trichogramma atopovirilia Oatman & Platner, 1983, uma espécie relatada anteriormente parasitando ovos de noctuídeos que atacam a cultura do milho (RESENDE & CIOCIOLA 1996;ZUCCHI & MONTEIRO 1997;PARON et al 1998), foi encontrada pela primeira vez parasitando ovos de A. gemmatalis em soja no sul do Paraná . Milho e soja são comumente cultivados em conjunto no sul do Brasil, e a ocorrência de T. atopovirilia num hospedeiro não preferencial poderia ser um evento ocasional devido à proximidade das duas culturas.…”

Section: Introductionunclassified

“…2); esse valor é acentuadamente maior do que aquele registrado por PARON et al (1998), que obtiveram para fêmeas de mesma idade e durante o mesmo tempo de exposição, uma média de apenas 8,0 ovos parasitados. Tal diferença provavelmente se deve ao fato das fêmeas de T. atopovirilia Tabela II.…”

Section: Introductionunclassified

Incidência natural e biologia de Trichogramma atopovirilia Oatman & Platner, 1983 (Hymenoptera, Trichogrammatidae) em ovos de Anticarsia gemmatalis Hübner, 1818 (Lepidoptera, Noctuidae)

Cańete¹,

Foerster²

2003

Rev. Bras. entomol.

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ABSTRACT. Natural incidence and biology of Trichogramma atopovirilia Oatman & Platner, 1983 (Hymenoptera, Trichogrammatidae) in eggs of Anticarsia gemmatalis Hübner, 1818 (Lepidoptera, Noctuidae). Trichogramma atopovirilia Oatman & Platner is an egg parasitoid of the corn earworm Helicoverpa zea (Boddie) (Lepidoptera, Noctuidae), and has recently been collected from eggs of Anticarsia gemmatalis Hübner on soybeans. In order to evaluate the suitability of A. gemmatalis eggs as hosts of T. atopovirilia, field surveys were conducted in 1999 and 2000 on corn and soybeans, and a colony of the parasitoid was established in laboratory. At 25 ºC, development from oviposition to emergence lasted nine days and a sex-ratio of 0.58 (females:males) was obtained. Females lived significantly longer (11.4 days) when kept in ovipositional activity, than in the absence of host eggs (6.6 days). Total fecundity averaged 104.5 parasitized eggs, resulting in the emergence of 138.3 descendents. Mean daily fecundity was highest (30 eggs/female) on the first day. Oviposition continued until one day before the death of the females, however 70% of the eggs were laid during the first four days after emergence. A female-biased progeny was produced during the first three days of oviposition, whereas further ovipositions were male-biased. Females lived significantly longer when exposed to host eggs in comparison to females deprived of eggs. The results show that eggs of A. gemmatalis are suitable for the development of T. atopovirilia, and this parasitoid should be considered in future programs of biological control of the velvetbean caterpillar.

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Efeito de genótipos de milho no parasitismo por Trichogramma spp. em ovos de Helicoverpa zea (Boddie)

Cited by 3 publications

References 6 publications

Short-term assessment of bt maize on non-target arthropods in Brazil

Short-term assessment of bt maize on non-target arthropods in Brazil

Chlorpyrifos spraying of no‐tillage corn during tasselling and its effect on damage by Helicoverpa zea (Lep., Noctuidae) and on its natural enemies

Incidência natural e biologia de Trichogramma atopovirilia Oatman & Platner, 1983 (Hymenoptera, Trichogrammatidae) em ovos de Anticarsia gemmatalis Hübner, 1818 (Lepidoptera, Noctuidae)

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