Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Biology of Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae) on seven natural foods
Bentancourt, Carlos M.;Scatoni, Iris B.;Gonzalez, Alvaro;Franco, Jorge;
Neotropical Entomology , 2004, DOI: 10.1590/S1519-566X2004000300004
Abstract: the effect of seven natural diets on the development and reproduction of bonagota cranaodes (meyrick) was evaluated under laboratory conditions. the experiments were carried out at the temperature of 23 ± 1oc, with 70 ± 10% of rh and a photoperiod of 16:8h (l:d). the larvae were reared on apple, grapevine and honeysuckle (lonicera japonica). on the first two foods three types of diet were used: spring leaves, summer leaves and fruits. the number of instars varied from five to seven. the larvae reared on apple leaves had, in general, fewer instars than those reared on grapevine and honeysuckle leaves. the duration of larval development differed between diets. the larvae reared on spring apple leaves showed the shortest duration, and those on fruit the longest. the larvae survival was lower on fruit than on leaves, and on apples it was particularly low (17.8%). the female pupae reared on honeysuckle were heavier than those reared on the other diets. the cycle from the egg to the emergence of adults varied between 41 days on spring apple leaves and 60 days on apples. the females reared on honeysuckle and spring apple leaves were the most fecund, whereas the females on apples did not oviposit. honeysuckle and spring leaves were the most suitable foods. apples, on the other hand, were the least suitable diet, which leads one to think that larvae could hardly complete their whole cycle on this fruit.
Efeito do raleio de frutos sobre o dano de Bonagota cranaodes (Meyrick, 1937) (Lepidoptera: Tortricidae) em cultivares de macieira
Botton, Marcos;Nakano, Octávio;Kovaleski, Adalécio;
Ciência Rural , 2000, DOI: 10.1590/S0103-84782000000400027
Abstract: the effect of fruit thinning on apple leafroller bonagota cranaodes (meyrick, 1937) (lepidoptera: tortricidae) damage was evaluated in commercial orchards of fuji and gala cultivars. at harvest, appies produced in clusters of two, three or four fruits and isolated ones were evaluated for percentage of pest damage. a positive correlation between lhe number of fruits per cluster and percentage of appie leafroller damage was observed. the injury to fruits was higher during late season cultivar fuji (harvested in april) than early season gala (february). fruits produced in isolated floral buds were significativelly less damaged by the pest than in cluster, indicating that is possible io use apple thinning to reduce apple leafroller damage in commercial orchards.
Exigências térmicas e estimativa do número de gera??es de Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae) em regi?es produtoras de ma?? do Sul do Brasil
Botton, Marcos;Nakano, Octávio;Kovaleski, Adalécio;
Anais da Sociedade Entomológica do Brasil , 2000, DOI: 10.1590/S0301-80592000000400002
Abstract: the thermal requirements of the apple leafroller bonagota cranaodes (meyrick) (lepidoptera: tortricidae) were estimated at four constant temperatures (14, 18, 22 e 26oc) in laboratory (70±10% r.h. and 14:10l:d). artificial diet was fed to the insects. the low threshold temperature and thermal requirement for eggs, larvae, pupae and biological cycle (egg to adult) were 7,2 e 140; 7,1 e 410; 6,4 e 183 e 6,8oc and 745 gd, respectively. it was estimated that this species complete three to four annual generations. in the three regions, one generation occurs during the winter.
Botton, Marcos;Nakano, Octávio;Kovaleski, Adalécio;
Ciência Rural , 2002, DOI: 10.1590/S0103-84782002000200026
Abstract: a survey of parasitoids associated with apple leafroller bonagota cranaodes and the level of parasitism was evaluated in commercial apple orchards in vacaria, rs, brazil (28o30's/50o54w) by collecting eggs, larvae and pupae from january to june, 1997. three species of parasitoids (apanteles sp, earinus sp. and itoplectis brasiliensis) were found associated with b. cranaodes larvae and pupae. i. brasiliensis was the most frequent specie, with 51.7 % of insects collected. the average of parasitism was 1.7 %, with maximum of 6.7 % in the first week of may. no parasitoids were found associated with b. cranaodes eggs. mortality caused by parasitoids was not considered an important agent of control of the apple leafroller in commercial apple orchards of southern brazil.
Botton Marcos,Nakano Octávio,Kovaleski Adalécio
Ciência Rural , 2002,
Abstract: Os parasitóides associados à lagarta-enroladeira-da-macieira Bonagota cranaodes e o índice de parasitismo em pomares comerciais foram avaliados em Vacaria, RS (28o30'S/50o54W). A coleta das fases de desenvolvimento do inseto foi realizada no período de janeiro a junho de 1997. Lagartas de B. cranaodes foram parasitadas por insetos da família Braconidae (Apanteles sp e Earinus sp.) e Ichneumonidae (Itoplectis brasiliensis), sendo esta, a espécie mais freqüente, com 51,7% dos indivíduos coletados. O índice médio de parasitismo foi de 1,7 % com máximo de 6,3 % na primeira quinzena de maio. N o foram encontrados parasitóides associados à fase de ovo de B. cranaodes. Com base nestas informa es, verificou-se que o parasitismo n o é um fator importante de mortalidade da lagarta-enroladeira nos pomares comerciais de macieira.
Ocorrência de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) em ovos de Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae) em macieira
Monteiro, Lino Bittencourt;Souza, Alexandre de;Belli, Edson Luiz;Silva, Ranyse Barbosa Querino da;Zucchi, Roberto Antonio;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000100045
Abstract: apple leaf roller, bonagota cranaodes (meyrick) is native from south america and it is one of the most important apple pests in brazil. its control is exclusively done by insectides and biological control isn't frequently applied. in this way is necessary to know the parasitoids associated with apple leaf roller. the objective of this study was to detect the parasitism occurrence on b. cranaodes eggs in the state of santa catarina (brazil). from january 2000 to november 2001; 1,700 masses were collected on leaves of apple tree, hydrangea macrophyla and hedera sp. in fraiburgo, santa catarina state. during this period egg parasitism was registered in 6.6% of masses where 22.3% of the eggs suffered parasitism. the parasite identified was trichogramma pretiosum. this is the first record of parasitizing of trichogramma pretiosum in b. cranaodes eggs in commercial apple orchards in brazil.
Desenvolvimento e exigências térmicas de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) em ovos de Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae)
Fonseca, Fabiana L. da;Kovaleski, Adalecio;Foresti, Josemar;Ringenberg, Rudiney;
Neotropical Entomology , 2005, DOI: 10.1590/S1519-566X2005000600011
Abstract: the aim of this study was to evaluate the development of trichogramma pretiosum riley on eggs of bonagota cranaodes (meyrick) under different temperatures. b. cranaodes eggs were maintained under seven constant temperatures (14, 18, 20, 22, 25, 28 and 30oc), 70 ± 10% r.h. and, 14 h l. forty replicates with 20 parasitized eggs each were kept in glass tubes (8.5 x 2.5 cm) covered with a plastic film. the method of hyperbole was used to calculate the temperature threshold (tb) and the thermal constant (k). the tb obtained was 11.9oc and to thermal constant was 153,4 dd. the most favorable temperature range was from 25oc to 30oc, at which the shortest egg-adult development period and the highest survivorship were observed.
Biologia e exigências térmicas de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) sobre ovos de Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae)
Borba, Regina da Silva;Garcia, Mauro Silveira;Kovaleski, Adalécio;Comiotto, Andressa;Cardoso, Renata Loureiro;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000500001
Abstract: this work was aimed at studyng the biology of trichogramma in laboratory, in search of its use in integrated management programs to control bonagota cranaodes in culture of the apple. the biology of trichogramma bruni nagaraja and of two lineages (l3 and l4) of trichogramma pretiosum on eggs of b. cranaodes was done such their thermal demands and annual number of generations. the line l3 presented more parasitism (52.3%), however, the feseability was similar among the lineages studied; with biological cycle of 8.7 days; the longevity of females was 10.65 days; low threshold temperature of 11.35°c and thermal requirement of 128.70 gd, the number of annual generations this line in laboratory was 47.22 and 13.59 for vacaria-rs climate conditions. the low parasitism of the t. bruni and of the lineage l4 of t. pretiosum can be related to the layer of secretion presented on the laying of the pest. although this parasitism is considered low, the use of these lineages cannot be discarded the integrated apple production, systens. new studies shal be accomplished in field conditions.
Biologia e exigências térmicas de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) sobre ovos de Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae)  [cached]
Borba Regina da Silva,Garcia Mauro Silveira,Kovaleski Adalécio,Comiotto Andressa
Ciência Rural , 2006,
Abstract: Este trabalho teve como objetivo estudar a biologia de Trichogramma em laboratório, visando a sua utiliza o em programas de manejo integrado para o controle de Bonagota cranaodes na cultura da macieira. A biologia de Trichogramma bruni Nagaraja e de duas linhagens (L3 e L4) de Trichogramma pretiosum foi realizada sobre ovos de B. cranaodes. Além disso, suas exigências térmicas e o número anual de gera es também foram determinados. A linhagem L3 apresentou maior parasitismo (52,3%), no entanto, a viabilidade foi semelhante entre as linhagens estudadas, com ciclo evolutivo de 8,7 dias, longevidade de fêmeas de 10,65 dias, temperatura base de 11,35degreesC e constante térmica de 128,70GD. O número de gera es anuais dessa linhagem em laboratório foi de 47,22 e de 13,59 gera es para as condi es da regi o de Vacaria - RS. O baixo parasitismo de T. bruni e da linhagem L4 de T. pretiosum pode estar ligado à camada de secre o existente sobre as posturas da praga. Embora este parasitismo seja considerado baixo, a utiliza o destas linhagens n o pode ser descartada dentro do sistema de Produ o Integrada da Ma , devendo novos estudos serem realizados em condi es de campo.
Concentra??o e tempo de libera??o do ferom?nio sexual sintético de Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae) na cultura da macieira
Kovaleski, Adalecio;Botton, Marcos;Nakano, Octavio;Vilela, Evaldo F.;Eiras, álvaro E.;
Neotropical Entomology , 2003, DOI: 10.1590/S1519-566X2003000100006
Abstract: the effect of five dosis of the synthetic sex pheromone of bonagota (=phtheochroa) cranaodes (meyrick) (a 9:1 blend of e,z 3,5 dodecanyl acetate and z9 hexadecenyl acetate) and the duration of the synthetic pheromone under field conditions were evaluated in a commercial apple orchard in vacaria, rs, brazil. no significant differences were observed among concentrations ranging from 0.25 to 3.0 mg per rubber septum. delta traps baited with two virgin females were ca. four times more attractive than those baited with the synthetic sex pheromone at the dosis of 3 mg per septum. rubber septa containing this amount of synthetic sex pheromone remained attractive for 120 days. comparing number of males captured in traps baited with the synthetic pheromone and males captured in traps with virgin females during seven months, a significant and positive correlation is observed, demonstrating that the seasonal variations in b. cranaodes population density are detected using the synthetic sex pheromone in delta traps.
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.