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Search Results: 1 - 10 of 405068 matches for " Holtz Anderson M. "
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Ocorrência de Trichogramma pretiosum em áreas comerciais de tomate, no Espírito Santo, em regi es de diferentes altitudes
Pratissoli Dirceu,Fornazier Mauricio J.,Holtz Anderson M.,Gon?alves José R.
Horticultura Brasileira , 2003,
Abstract: Foram instalados sete campos experimentais em altitudes entre 200 e 1050 metros, nos municípios de Afonso Cláudio e Venda Nova do Imigrante no Espírito Santo, para desenvolvimento de avalia es pré-introdutórias de Trichogramma. Visou-se determinar as espécies nativas e conhecer o índice de parasitismo natural, para utiliza o em programas de manejo integrado da tra a-do-tomateiro. Em todos os campos comerciais de tomateiros foram coletados apenas Trichogramma pretiosum Riley. No primeiro ano de coleta, o número médio de amostras de cartelas com parasitismo, bem como o número médio de ovos parasitados, apresentaram uma rela o inversa, quando comparado com as regi es de altitudes entre 200 e 850 metros. Em regi es de menor altitude (200, 380 e 450 metros), foram observadas presen a constante desses parasitóides de ovos em todas as áreas amostradas. No segundo ano de coleta n o foi observado o mesmo comportamento em rela o ao primeiro, tendo os valores médios dos parametros sido inferiores, com o número médio de ovos parasitados por cartela reduzido pela metade. Os resultados de dois anos de coleta mostraram que a agressividade das linhagens de T. pretiosum foi diferenciada em fun o das áreas.
Influência do substrato alimentar sobre o desenvolvimento de Diaphania hyalinata L. (Lepidoptera: Crambidae)
Pratissoli, Dirceu;Polanczyk, Ricardo A.;Holtz, Anderson M.;Tamanhoni, Tiago;Celestino, Flávio N.;Borges Filho, Raul da C.;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000400002
Abstract: the aim of this research was to evaluate the biological behaviour of melonworm at different natural and artificial diets. squash cultivar jacaré, cucumber, summer squash and an artificial diets developed by hensley & hammond for the sugarcane borer were tried. the research was carried out in the laboratório de entomologia do centro de ciências agrárias of the universidade federal do espírito santo, in climatized room at 25 ± 1oc, relative humidity of 70 ± 10% and 14h photofase. the caterpillars fed on each substrate during the whole life cycle. differences in duration of the larval period, larvae and pupae survival, adult longevity and number of eggs were registered between the substrates. the results show that the best diet for rearing is the artificial one. between the natural diets the cucumber showed the best results.
Selection of Trichogramma species for controlling the Diamondback moth
Pratissoli, Dirceu;Polanczyk, Ricardo A;Holtz, Anderson M;Dalvi, Leandro P;Silva, Alexandre F;Silva, Luciano N;
Horticultura Brasileira , 2008, DOI: 10.1590/S0102-05362008000200013
Abstract: biological characteristics of the egg parasitoids trichogramma acacioi, t. atopovirilia, and t. bennetti were studied to select the one with better performance on the control of the diamondback moth, plutella xylostella. parasitism rate, viability, and sex ratio were studied. parasitism rate ranged from 1.67 to 41.33%. t. atopovirilia and t. acacioi were respectively the most and less aggressive species. the viability ranged from 6.20% for t. acacioi to 53.34% for t. atopovirilia. there were no differences on sex ratio (p < 0.05) that remained above 0,88. t. atopovirilia was the species with best performance in the laboratory when rearing on the diamondback moth eggs.
Selection of Trichogramma species for controlling the Diamondback moth
Pratissoli, Dirceu;Polanczyk, Ricardo A;Holtz, Anderson M;Dalvi, Leandro P;Silva, Alexandre F;Silva, Luciano N;
Horticultura Brasileira , 2008, DOI: 10.1590/S0102-05362008000200026
Abstract: biological characteristics of the egg parasitoids trichogramma acacioi, t. atopovirilia, and t. bennetti were studied to select the one with better performance on the control of the diamondback moth, plutella xylostella. parasitism rate, viability, and sex ratio were studied. parasitism rate ranged from 1.67 to 41.33%. t. atopovirilia and t. acacioi were respectively the most and less aggressive species. the viability ranged from 6.20% for t. acacioi to 53.34% for t. atopovirilia. there were no differences on sex ratio (p<0.05) that remained above 0,88. t. atopovirilia was the species with best performance in the laboratory when rearing on the diamondback moth eggs.
Ocorrência de Trichogramma pretiosum em áreas comerciais de tomate, no Espírito Santo, em regi?es de diferentes altitudes
Pratissoli, Dirceu;Fornazier, Mauricio J.;Holtz, Anderson M.;Gon?alves, José R.;Chioramital, Andrea B.;Zago, Hugo B.;
Horticultura Brasileira , 2003, DOI: 10.1590/S0102-05362003000100015
Abstract: seven experimental fields were installed in altitudes varying from 200 to 1050 meters, located in afonso cláudio and venda nova do imigrante in espírito santo state, brazil. the evaluations of trichogramma presence were done to determine the native species, know the natural parasitism rate in order to use the obtained results in programs of pest management of tuta absoluta. in all commercial tomato fields only trichogramma pretiosum riley was collected. in the first year the medium number of egg-cards sample with parasitism, as well as the medium number of parasitized eggs, presented an inverse relationship when compared to the areas of altitude between 200 and 850 meters. in the lower areas (200, 380 and 450 m) a constant presence of parasitoid eggs in all the inspected areas was observed. in the second year the behavior differed from that of the first year. the medium values of the inferior parameters, with the medium number of eggs parasitized by cards, were reduced by half. the two year results showed that the aggressiveness of the t. pretiosum strains was differentiated depending on the area.
Desenvolvimento da broca-das-cucurbitáceas em diferentes tipos de substratos alimentares
Pratissoli, Dirceu;Polanczyk, Ricardo Ant?nio;Holtz, Anderson Mathias;Cocheto, Juliéder G;Tamanhoni, Tiago;Milanez, André M;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000400021
Abstract: the aim of this research was to evaluate the biological behaviour of melonworm at different natural and artificial diet under laboratory conditions (25oc, 70% rh, 14 h photofase). squash 'jacaré', cucumber 'japonês' and zucchini 'caserta' were used as natural substrates compared to na artificial diet developed for the sugarcane borer (diatraea saccharalis). the caterpillars were inoculated in each substrate and reared for a full cycle. the biological parameters were different among treatments. an artificial diet and squash cv. jacaré substrate showed higher performance for the multiplication of d. nitidalis. the artificial diet is recommended because it is easy to obtain the ingredients and nultiply this insect under laboratory conditions.
Desempenho de Thyrinteina arnobia Stoll (Lepidoptera: Geometridae) em eucalipto e goiaba: o hospedeiro nativo n?o é um bom hospedeiro?
Holtz, Anderson M.;Oliveira, Hamilton G. de;Pallini, Angelo;Venzon, Madelaine;Zanuncio, José C.;Oliveira, Claudinei L.;Marinho, Jeanne S.;Rosado, Maria da C.;
Neotropical Entomology , 2003, DOI: 10.1590/S1519-566X2003000300007
Abstract: plants can develop mechanisms of defense that reduces the effects of herbivore attacks. in response, the herbivores evolve to breaking the defense mechanisms of plants. herbivores may also escape from the plant defense system by migrating to other host whose defense is not effective against them. in brazil, outbreaks of the defoliator caterpillar thyrinteina arnobia stoll in eucalyptus sp. are frequently observed. however, the native host of this insect is guava, psidium guajava where outbreaks are not registered. the absence of outbreaks in p. guajava may be related to the development of defense mechanisms in that specie of myrtaceae, which has apparently not yet occurred on eucalyptus. here we investigated the performance of t. arnobia reared on its origin host plant, in comparison with those reared on its exotic host, eucalyptus sp. the intrinsic growth rate of t. arnobia was higher on eucalyptus than on p. guajava. it is possible that the defense mechanism on guava plants acts as a chemical barrier, probably reducing the digestibility of the insect, which could affect the development of the current population and the next generations.
Barrier and well-width dependence of optical emission of GaN/AlGaN quantum well nanostructures
H. Haratizadeh,M. Esmaeili,P. O. Holtz
Iranian Journal of Physics Research , 2007,
Abstract: Internal polarizations field which take place in quantum structures of group-III nitrides have an important consequence on their optical properties. Optical properties of wurtzite AlGaN/GaN quantum well (QW) structures grown by MBE and MOCVD on c-plane sapphire substrates have been investigated by means of photoluminescence (PL) and time resolved photoluminescence (TRPL) at low-temperature. PL spectra exhibit a blue-shifted emission of AlGaN/GaN quantum well (QW) nanostructures by decreasing the barrier width contrary to the arsenide system. The trend of the barrier-width dependence of the internal polarization field is reproduced by using simple electrostatic arguments. In addition the effect of well width variation on the optical transition and decay time of GaN MQWs have been investigated and it has been shown that the screening of the piezoelectric field and the electron-hole separation are strongly dependent on the well thickness and have a profound effect on the optical properties of the GaN/AlGaN MQWs.
Características biológicas de linhagens de Trichogramma pretiosum, criados em ovos de Sitotroga cerealella e Anagasta kuehniella
Pratissoli, Dirceu;Holtz, Anderson Mathias;Gon?alves, José Roberto;Oliveira, Regiane Cristina de;Vianna, Ulysses Rodrigues;
Horticultura Brasileira , 2004, DOI: 10.1590/S0102-05362004000300012
Abstract: the biological characteristics of five lineages of t. pretiosum riley (hym.: trichogrammatidae), collected from tomato crops, and reared in a. kuehniella (zeller) and s. cerealella (olivier) eggs were evaluated. the parasitism rate of the lineages, varied from 56,1 to 68.6%, when the host was a. kuehniella, being higher than for s. cerealella. the viability of all lineages, when reared in s. cerealella eggs, was superior to 90%; however, only those lineages reared in s. cerealella eggs and collected in afonso cláudio and venda nova dos imigrantes (espirito santo state, brazil) were significantly higher than those reared on a. kuehniella. the longevity of the offspring submitted to the parasitism, was higher in all the lineages reared in a. kuehniella eggs. all five lineages can be mass reared using both hosts. however, considering the parasitism rate and the quality of the progeny, the host a. kuehniella seems to be superior than s. cerealella
O EMBRI?O DE THYRINTEINA ARNOBIA (LEPIDOPTERA: GEOMETRIDAE) PODE PRODUZIR PROTE??O AO PARASITISMO DE ESPéCIES DE TRICHOGRAMMA?
Rodrigues Vianna,Ulysses; Suemi Saito,Nathália; Mathias Holtz,Anderson; Pratissoli,Dirceu; Antonio Polanczyk,Ricardo;
Idesia (Arica) , 2006, DOI: 10.4067/S0718-34292006000300008
Abstract: defoliator caterpillar cause damages in eucalyptus plantations. a control alternative is the use of trichogramma which, even though has been found parasitizing some species in eucaliptus, does not meet cases of t. arnobia parasitism. the objective of this research was to evaluate the parasitism of trichogramma pratissolii querino & zucchi (hymenoptera: trichogrammatidae) on unviable t. arnobia eggs. unviable t. arnobia eggs were glued on light blue cardboard rectangles, and exposed to the parasitism of t. pratissolii for 24 hours. after this period there was observed 100% mortality of the individuals, though the glued eggs did not present parasitism.
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