oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Biologia do ácaro predador Euseius alatus DeLeon (Acari: Phytoseiidae)
Reis, Paulo R.;Alves, Everaldo B.;
Anais da Sociedade Entomológica do Brasil , 1997, DOI: 10.1590/S0301-80591997000200018
Abstract: euseius alatus deleon is a predaceous mite found on citrus plants (citrus spp.) in brazil, with a life cycle similar to the species of the same genus. incubation period, larval, protonymphal and deutonymphal stages lasted ca. 24 h each, when mites were fed castor bean (ricinus communis ) pollen and kept at 25 ± 2 °c, 70 ± 10% rh and 14 h photophase. oviposition period lasted 26.5 days, and the oviposition rate was 1.4 eggs/day. the intrinsic rate of increase (rm) was 0.217; population increased 1.2 times a day and double its population every 3.2 days. the population of e. alatus increase 21.4 times (ro) in the period of one generation (t = 14.1 days).
Pode Euseius alatus DeLeon (Acari: Phytoseiidae) predar Aceria guerreronis Keifer (Acari: Eriophyidae) em coqueiro?
Melo, José W da S;Domingos, Cleiton A;Gondim Jr, Manoel G C;Moraes, Gilberto J de;
Neotropical Entomology , 2009, DOI: 10.1590/S1519-566X2009000100016
Abstract: mites of the genus euseius are generally considered specialist as pollen feeders. euseius alatus deleon is one of the six species of phytoseiid mites most commonly found on coconut plants in northeast brazil associated with aceria guerreronis keifer. although the morphology of e. alatus does not favor the exploitation of the meristematic area of the fruit inhabited by a. guerreronis, the predator may have some role in the control of this eriophyid during the dispersion process. the objective of this work was to evaluate the development and reproduction of e. alatus on the following diets: a. guerreronis, ricinus communis pollen (euphorbiaceae), and tetranychus urticae koch (tetranychidae) + r. communis pollen + honey solution 10%. euseius alatus developed slightly faster and had slightly higher oviposition rate when feeding on the diet composed of t. urticae + pollen + honey. however, life table parameters were very similar on all diets, suggesting that e. alatus may contribute in reducing the population of a. guerreronis in the field.
SELETIVIDADE DE CHLORFENAPYR E FENBUTATIN-OXIDE SOBRE DUAS ESPéCIES DE áCAROS PREDADORES (ACARI: PHYTOSEIIDAE) EM CITROS
REIS, PAULO REBELLES;SOUSA, éLBER OLIVEIRA;
Revista Brasileira de Fruticultura , 2001, DOI: 10.1590/S0100-29452001000300028
Abstract: through the bioassays, it was verified the residual contact, ovicidal and persistence effects of the products chlorfenapyr and fenbutatin-oxide on two species of predaceous mites, iphiseiodes zuluagai denmark & muma and euseius alatus deleon (acari: phytoseiidae), associated to the citrus leprosis mite brevipalpus phoenicis (geijskes) (acari: tenuipalpidae). the adult total effect was studied through the residual spray contact method in glass surface, according to iobc methodology. ovicidal effect was evaluated through direct spray on the predators mite eggs, also in glass surface. persistence of the products was evaluated, in laboratory conditions, in arenas made with sprayed orange leaves in the field at 0, 5, 15 and 30 days after the application. results showed that chlorfenapyr was noxious to i. zuluagai and e. alatus, and fenbutatin-oxide was slightly harmful to e. alatus and innocuous to i. zuluagai. none of the products presented ovicidal effect. fenbutatin-oxide presented low persistence to both predators mite species, and chlorfenapyr in the smallest rate (31.3 ml) was of low persistence and in the great one (62.5 ml) moderately persistent. fenbutatin-oxide was innocuous and slightly harmful to the predaceous mites i. zuluagai and e. alatus, respectively, and of low persistence for both species
ácaros da família Phytoseiidae associados aos citros no município de Lavras, Sul de Minas Gerais
Reis, Paulo R.;Chiavegato, Luiz G.;Alves, Everaldo B.;Sousa, Elber O.;
Anais da Sociedade Entomológica do Brasil , 2000, DOI: 10.1590/S0301-80592000000100012
Abstract: a survey of the species of predaceous mites belonging to the phytoseiidae family was run every other week for a three-year period on 'valencia' orange tree leaves (citrus sinensis osbeck) in lavras, minas gerais state, brazil. iphiseiodes zuluagai denmark & muma and euseius alatus deleon were the most frequent, the first one representing 66.2% and the second 29.8% of the collected mites. both were found during the whole period, and i. zuluagai occurred mostly between april and september (autumn and winter), period of mild temperatures and low rainfalls. the species e. alatus, presented higher occurrence between october and february that corresponded to the higher temperatures and pluvial precipitation period. other surveyed species and percentages of occurrence were: amblyseius compositus denmark & muma (2,6%), amblyseius herbicolus (chant) (1,1%) and phytoseiulus macropilis (banks) (0,3%), being a. compositus the most frequent; the other species were occasional.
Effect of prey density on the functional and numerical responses of two species of predaceous mites (Acari: Phytoseiidae)
Reis, Paulo R.;Sousa, Elber O.;Teodoro, Adenir V.;Pedro Neto, Mar?al;
Neotropical Entomology , 2003, DOI: 10.1590/S1519-566X2003000300013
Abstract: phytoseiidae mites are the most important and studied natural enemies of pest mites. a question frequently raised is whether phytoseiid may reduce high densities of phytophagous mites. studies of functional and numerical responses may help to answer this question. the aim of this work was to evaluate the potential predation success of iphiseiodes zuluagai denmark and muma and euseius alatus deleon (acari: phytoseiidae) on brevipalpus phoenicis (geijskes) (acari: tenuipalpidae), vector of the citrus leprosis and the coffee ringspot viruses. bioassays were performed in the laboratory. adult females of each predator were isolated in arenas made with citrus leaves (3-cm diameter). immature stages of b. phoenicis were offered as prey, at the following numbers/arena: 1, 2, 5, 10, 20, 30 and 35 (seven replicates), 45 (four replicates), 55 (three replicates) and 70, 100, 125, 200 and 300 (two replicates). the number of killed prey and of eggs laid by the predators was evaluated every 24h, during eight days. killed prey was replaced daily by new prey. for both predatory mites, a positive and highly significant correlation was found between the numbers of prey offered and killed. the average daily oviposition rate also increased with the number of killed prey. at the lower densities, e. alatus killed and ate more b. phoenicis than i. zuluagai. the opposite was observed at the highest densities. it is possible that e. alatus can reduce b. phoenicis population even at low prey densities, and i. zuluagai can do the same also at high densities. the fact that e. alatus requires less prey than i. zuluagai suggests that its survivorship may be higher than that of i. zuluagai at low prey densities.
Toxicidade de formula??es de nim (Azadirachta indica A. Juss.) ao ácaro-rajado e a Euseius alatus De Leon e Phytoseiulus macropilis (Banks) (Acari: Phytoseiidae)
Brito, Hilda M.;Gondim Jr., Manoel G.C.;Oliveira, José V. de;Camara, Cláudio A.G. da;
Neotropical Entomology , 2006, DOI: 10.1590/S1519-566X2006000400012
Abstract: the toxicity of selected commercial formulations of neem on tetranychus urticae koch (acari: tetranychidae) and two predatory mites euseius alatus de leon and phytoseiulus macropilis (banks) was studied. topical toxicity was tested with the commercial formulations (natuneem, neemseto and callneem) and extract of neem's seeds at concentration 1%, compared to the standard acaricide abamectin at concentration of 0.3 ml/l and the control treatment (distilled water). based on the best performance against t. urticae through topical contact, the formulation neemseto was selected to be evaluated using different concentrations against eggs, and residual and repellent effects on adults of the mites. egg treatment consisted of dipping eggs into neemseto dilutions and control treatment for five seconds. in addition, residual and repellent effects of neemseto for adult mites consisted of using leaf discs dipped into the dilutions for five seconds. the toxicity of neemseto on eggs and adults was greater for t. urticae compared to the toxicity observed for the predatory mites. neemseto was repellent for t. urticae and e. alatus when tested at the concentrations of 0.25, 0.50 and 1.0%, and did not affect p. macropilis. neemseto using all concentrations, while for the predatory mites significant reduction of mite fecundity was only observed at the largest concentrations reduced the fecundity of t. urticae significantly. so neemseto, among tested neem formulations, performed better against the twospotted spider mite and exhibited relatively low impact against the predatory mites studied.
SELETIVIDADE DE CHLORFENAPYR E FENBUTATIN-OXIDE SOBRE DUAS ESPéCIES DE áCAROS PREDADORES (ACARI: PHYTOSEIIDAE) EM CITROS
REIS PAULO REBELLES,SOUSA éLBER OLIVEIRA
Revista Brasileira de Fruticultura , 2001,
Abstract: Com o uso de bioensaios, verificaram-se os efeitos residual de contato, ovicida e de persistência dos produtos chlorfenapyr e fenbutatin-oxide sobre duas espécies de ácaros predadores, Iphiseiodes zuluagai Denmark & Muma e Euseius alatus DeLeon (Acari: Phytoseiidae), associados ao ácaro da leprose-dos-citros Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae). O efeito total sobre os adultos foi estudado por meio do método residual de contato com pulveriza o em superfície de vidro, conforme metodologia da IOBC. O efeito ovicida foi avaliado por meio de pulveriza o direta sobre os ovos dos ácaros predadores, também em superfície de vidro. A persistência dos produtos foi avaliada em laboratório, em arenas confeccionadas com folhas de laranjeira pulverizadas no campo, aos 0; 5; 15 e 30 dias após a aplica o. Os resultados obtidos mostraram que chlorfenapyr foi nocivo ao I. zuluagai e E. alatus e o fenbutatin-oxide foi levemente nocivo a E. alatus e inócuo a I. zuluagai. Nenhum dos produtos apresentou efeito ovicida. Fenbutatin-oxide apresentou baixa persistência para ambas as espécies de ácaros predadores, e chlorfenapyr, na dosagem de 31,3 ml, foi de baixa persistência, enquanto, na dosagem de 62,5 ml, foi moderadamente persistente. O fenbutatin-oxide apresentou-se inócuo e levemente nocivo aos ácaros predadores I. zuluagai e E. alatus, respectivamente, e de baixa persistência para ambas as espécies
Fitoseídeos (Acari: Phytoseiidae) associados a cafezais e fragmentos florestais vizinhos
Silva, Ester Azevedo;Reis, Paulo Rebelles;Zacarias, Maurício Sérgio;Marafeli, Patrícia Pádua;
Ciência e Agrotecnologia , 2010, DOI: 10.1590/S1413-70542010000500010
Abstract: there is little information about the fauna of predatory mites (phytoseiidae) in brazilian natural environments, adjacent to coffee agroecosystems (coffea spp.), or about the influence exerted by neighbor vegetation as a reservoir of predatory mites. the objective of this study was to evaluate the diversity of these organisms in coffee plantations and adjacent forest fragments. samples of the species calyptranthes clusiifolia (miq.) o. berg (myrtaceae), esenbeckia febrifuga (a. st.-hil.) a. juss. ex mart., metrodorea stipularis mart. (rutaceae) and allophylus semidentatus (miq.) radlk. (sapindaceae) were collected in eight forest fragments, from 5 to 51ha, adjacent to coffee plantations, in june (end of the rainy season) and october (end of the dry season) in the years of 2004 and 2005, in the southern region of state of minas gerais. leaf mites were extracted using the wash method, mounted in microscopy slides with hoyer's medium for identification. a total of 2.348 phytoseiids was collected, being 2.090 in the forest fragments and 258 in adjacent coffee plantations, belonging to 38 species. according to fauna analysis, iphiseiodes zuluaguai denmark & muma, the year of 1972 presented the best indexes in the coffee agroecosystem, being very frequent and constant in those periods. in the forest fragments, amblyseius herbicolus chant, 1959, iphiseiodes affs. neonobilis denmark & muma, 1978, leonseius regularis deleon, 1965 and euseius alatus deleon, 1966 were dominant, very abundant, very frequent and constant in those periods. one may conclude that the native vegetation shelters predator mite, natural enemies of mite-pests that still occur in coffee culture, making possible ecological management program development involving areas of natural vegetation and adjacent coffee agroecosystems.
O valor de Mabea fistulifera Mart. (Euphorbiaceae), planta nativa do Brasil, como reservatório para o predador Euseius citrifolius Denmark & Muma (Acari, Phytoseiidae)
Daud, Rodrigo Damasco;Feres, Reinaldo José Fazzio;
Revista Brasileira de Zoologia , 2004, DOI: 10.1590/S0101-81752004000300006
Abstract: in this paper, pollen of mabea fistulifera mart. was evaluated as food for euseius citrifolius denmark & muma, 1970. the mites were kept in a rearing chamber at 25 ± 1°c, 60 ± 10% ur e 12 h of photophase. pollen of typha angustifolia l. and ricinus communis l. were used for comparison, because of their known suitability to this predator. the suitability of those three types of pollen was evaluated when they were stored for different periods at 10oc: newly collected to 11 days old (pollen i); from 15 to 26 days old (pollen ii) and from 30 to 41 days old (pollen iii). the suitability of each kind of food was determined based on the oviposition rate at 11 consecutive days. each experimental plot consisted of five females in an arena made of lemon leaf; treatments were replicated 10 times. oviposition rate for treatments were compared using anova, and bonferroni's test. pearson's correlation index was used to compare oviposition rates at different periods of store of pollen. there were significant differences (f = 4.78; df = 89, p < 0.0001) between some treatments: mites fed pollen iii of m. fistulifera had higher oviposition than those fed pollen i and r. communis pollen iii. mites fed pollen ii of t. angustifolia had higher oviposition rates than those fed pollen iii of r. communis. only females fed pollen of r. communis had negative correlation between oviposition rates and the periods of storage of pollen. the results showed that m. fistulifera pollen is used by e. citrifolius as food and comparable with pollen from t. angustifolia, futhermore, showed great durability when storage at 10oc.
ácaros predadores em pomares de ma?? no Rio Grande do Sul
Ferla, Noeli J.;Moraes, Gilberto J.;
Anais da Sociedade Entomológica do Brasil , 1998, DOI: 10.1590/S0301-80591998000400019
Abstract: a survey of predaceous mites in apple (prunus malus l.) orchards in central part of rio grande do sul state (serio and capit?o counties) was conducted from september 1993 to may 1994. the majority of the predators collected belonged to the phytoseiidae family. the most common species were neoseiulus tunus (deleon), euseius alatus deleon, and euseius brazilli (el-benhawy). in capit?o, euseius spp. were the predominant phytoseiids from the beginning of december 1993 to mid march 1994. in serio, euseius spp. were more abundant than n. tunus only at the end of january. the number of phytoseiids increased from the end of december 1993 to mid february 1994. the highest levels of stigmaeidae and cunaxidae occurred from the end of february to mid may, after the reduction of phytoseiids.
Page 1 /100
Display every page Item


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