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Search Results: 1 - 10 of 1627 matches for " egg parasitoid "
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Comportamento de parasitismo de Trichogramma atopovirilia Oatman & Platner e Trichogramma pretiosum Riley (Hymenoptera, Trichogrammatidae) em posturas de Spodoptera frugiperda (J. E. Smith) (Lepidoptera, Noctuidae)
Beserra, Eduardo B.;Parra, José R. P.;
Revista Brasileira de Entomologia , 2003, DOI: 10.1590/S0085-56262003000200009
Abstract: the parasitism behavior of trichogramma atopovirilia and t. pretiosum in spodoptera frugiperda eggs was evaluated focusing on the features related to the associative learning (alpha conditioning) and recognition of the egg parasitized by the female after the first oviposition experience. females of both species were observed to recognize the parasitized egg, which takes place after the female drills into the host egg. following oviposition, 43.59% and 67.53 of females began to feed with an average feeding time of 73.26 ± 11.57 and 64.04 ± 7.05 seconds for t. atopovirilia and t. pretiosum, respectively. the time elapsed in each step of the parasitism behavior significantly decreased after the first oviposition experience, with a trend to stabilize after the 2nd or 3rd egg parasitized, indicating associative learning in these trichogramma species.
Comportamento de parasitismo de Trichogramma atopovirilia Oatman & Platner e Trichogramma pretiosum Riley (Hymenoptera, Trichogrammatidae) em posturas de Spodoptera frugiperda (J. E. Smith) (Lepidoptera, Noctuidae)
Beserra Eduardo B.,Parra José R. P.
Revista Brasileira de Entomologia , 2003,
Abstract: The parasitism behavior of Trichogramma atopovirilia and T. pretiosum in Spodoptera frugiperda eggs was evaluated focusing on the features related to the associative learning (alpha conditioning) and recognition of the egg parasitized by the female after the first oviposition experience. Females of both species were observed to recognize the parasitized egg, which takes place after the female drills into the host egg. Following oviposition, 43.59% and 67.53 of females began to feed with an average feeding time of 73.26 ± 11.57 and 64.04 ± 7.05 seconds for T. atopovirilia and T. pretiosum, respectively. The time elapsed in each step of the parasitism behavior significantly decreased after the first oviposition experience, with a trend to stabilize after the 2nd or 3rd egg parasitized, indicating associative learning in these Trichogramma species.
Ocorrência de ginandromorfismo em Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae)
Beserra, Eduardo B.;Querino, Ranyse B.;Parra, José R.P.;
Neotropical Entomology , 2003, DOI: 10.1590/S1519-566X2003000300021
Abstract: egg parasitoids of genus trichogramma can reproduce by arrhenotokous or thelytokous parthenogenesis. thelytoky is genetically determined or induced by endosymbionts such as bacteria of the genus wolbachia. in thelytokous trichogramma populations, gynandromorphism - an individual having both male and female structures - can occur. gynandromorphism was observed in one specimen of trichogramma pretiosum riley in which the individual presented female genitalia and male antennae, a fact never reported before in trichogramma in latin america.
Effects of egg age of Spartocera dentiventris (Berg) (Hemiptera: Coreidae) on parasitism by Gryon gallardoi (Brethes) (Hymenoptera: Scelionidae)
Rocha, Luciane da;Kolberg, Roberta;Mendon?a Jr., Milton de S.;Redaelli, Luiza R.;
Neotropical Entomology , 2006, DOI: 10.1590/S1519-566X2006000500013
Abstract: to evaluate the effect of egg age of spartocera dentiventris (berg) on the parasitism by gryon gallardoi (brethes), groups of 12 eggs of 2, 3, 4, 5, 6, 7, 8, and 12 days old were exposed to one female of g. gallardoi on a test tube, with the wasp observed for 2h subsequently. later, the eggs were individualised and incubated (25 ± 1°c; 12h photoperiod) until adult emergence. to identify the preferred age, groups of 12 eggs of 1, 3, 5, 7 and 12 days of age were simultaneously exposed to a parasitoid female on an arena for 2h. these groups were also individualised and incubated until parasitism was confirmed. on all ages tested parasitism was at about 88.5 ± 2.64%, with a reduction in adult parasitoid emergence with age increasing (p < 0.01). the development time increased with increasing egg age (p < 0.01), with males developing faster. parasitoid sex ratio for all ages tested was female-biased (0.49:1), with the proportion of males invariant with host age (p > 0.05). when the egg groups were exposed simultaneously, the female preferred eggs one and three days old. the results indicate a preference of g. gallardoi for younger eggs of s. dentiventris, with host egg age exerting a negative effect on development time and offspring emergence of the parasitoid.
Biologia e exigências térmicas de Trichogramma atopovirilia Oatman & Platner (Hymenoptera: Trichogrammatidae) em ovos de Diaphania hyalinata L. (Lepidoptera: Pyralidae)
Melo, Ricardo L.;Pratissoli, Dirceu;Polanczyk, Ricardo A.;Melo, Débora F.;Barros, Reginaldo;Milanez, André M.;
Neotropical Entomology , 2007, DOI: 10.1590/S1519-566X2007000300011
Abstract: the development and parasitism of diaphania hyalinata l. eggs by trichogramma atopovirilia oatman & platner and its thermal requirements were studied at the temperatures of 18, 21, 24, 27, 30 and 33°c. thirty eggs of d. hyalinata were exposed to three females of t. atopovirilia for 5h at 25°c and incubated at the different temperatures. the developmental time from egg exposure to adult, parasitism viability, number of adults per parasitized host egg and progeny sex ratio were monitored. the developmental time from egg to adult emergence of the parasitoid exhibited inverse relationship to the temperature, lasting 24.12 days at 18°c and 7.36 days at 33°c. parasitism viability at 24, 27 and 30°c was higher than 90%. the ratio of t. atapovirilia adult produced per egg and its sex ratio were not affected when using d. hialynata as host. the lowest threshold temperature (tb) and estimated degree-days over tb required by t. atopovirilia to develop on eggs of d. hyalinata was 11.99°c and 130.42oc, respectively. considering the temperature regimes of two areas where cucurbitaces are cultivated in bahia state (rio real and inhambupe county) it was estimated that t. atopovirilia can achieve more than 32 generation per year. the results suggest that t. atopovirilia has potential to control d. hyalinata eggs with better chance of success under temperature regimes ranging from 24 to 27°c that meets the suitable field conditions for cropping cucurbitaces.
Primeiro relato de Trichogramma bruni Nagaraja (Hymenoptera: Trichogrammatidae) parasitando ovos de Urbanus proteus (L.) (Lepidoptera: Hesperiidae) em feij?o-vagem
Pratissoli, Dirceu;Polanczyk, Ricardo A.;Dalvi, Leandro P.;Silva, Alexandre F. da;Melo, Débora F. de;Celestino, Flávio N.;
Neotropical Entomology , 2007, DOI: 10.1590/S1519-566X2007000300023
Abstract: aiming to verify the presence of eggs parasitoids of the genus trichogramma, for using in the biological control of insects pests, were collected eggs from long tailed skipper butterfly, a lepidopteran defoliator of snap beans, which presented eggs with parasitism characteristics (dark eggs). the eggs were taken to the laboratory were 44.9% of parasitism was verified. viability was 96.3%, with an average of 6.6 individuals per egg and a sexual ratio of 0.93. male specimens were identified as trichogramma bruni nagaraja. it is the first report of parasitism in this host and culture.
Morphology and distribution of antennal sensilla of Gryon gallardoi (Brèthes) (Hymenoptera: Scelionidae) females
Rocha, Luciane da;Moreira, Gilson R.P.;Redaelli, Luiza R.;
Neotropical Entomology , 2007, DOI: 10.1590/S1519-566X2007000500013
Abstract: with the aid of scanning electron microscopy, the external morphology and distribution of the antennal sensilla were described for females of gryon gallardoi (bréthes), an egg-parasitoid of coreids. the geniculated and clavated antennae are composed of 12 antennomeres. along the flagelum we registered dorsal glands and seven types of sensilla: papillary, chaetica of two sizes - long and short types, styloconic grooved-peg, sickle-shaped and trichodea with numerical and spatial variation among the flagellomeres. functional aspects of the sensilla are discussed in the context of g. gallardoi antennal drumming behavior. thus, the determination and the description pattern of antennal sensilla in g. gallardoi, in the present study, is an advance regarding the elucidation of the mechanisms involved in the host selection behavior of this species.
Registro de Trichogramma demoraesi Nagaraja (Hymenoptera: Trichogrammatidae) parasitando ovos de Erynnyis ello (Lepidoptera: Sphingidae) na Amaz?nia Central
Ronchi-Teles, Beatriz;Querino, Ranyse B.;
Neotropical Entomology , 2005, DOI: 10.1590/S1519-566X2005000300023
Abstract: this paper records the occurrence of trichogramma demoraesi (hymenoptera: trichogrammatidae) in the north region of brazil.
A new species of Anagrus (Hymenoptera: Mymaridae) from Amazonas, Brazil
Triapitsyn, Serguei V.;Querino, Ranyse B.;Feitosa, Malu C.B.;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000600009
Abstract: a new fairyfly species from the neotropics, anagrus (anagrus) amazonensis triapitsyn, querino & feitosa, sp. n., is described and illustrated. anagrus haliday is a large genus of mymaridae (hymenoptera), which now includes eight species recorded from brazil. this new species attacks eggs of damselflies (odonata: zygoptera).
Espécies de Trichogramma (Hymenoptera: Trichogrammatidae) coletadas em armadilha de suc??o em reserva florestal
Querino, Ranyse B.;Zucchi, Roberto A.;
Neotropical Entomology , 2004, DOI: 10.1590/S1519-566X2004000400009
Abstract: for the first time an electrical suction trap was used to collect specimens of trichogramma. the total of 551 trichogramma specimens were collected belonging to nine species namely t. acuminatum querino & zucchi, t. alloeovirilia querino & zucchi, t. bruni nagaraja, t. parrai querino & zucchi, t. pretiosum riley, t. pusillus querino & zucchi, t. tupiense querino & zucchi, t. zucchii querino and trichogramma sp. aff. pintoi. t. bruni was the most abundant and frequent species. the relative frequency was less than 2% for the remaining species. the electrical suction trap was shown useful to collected trichogramma specimens in areas where host insect eggs are difficult to find.
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