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Search Results: 1 - 10 of 514336 matches for " Rafael Braga da;Corrêa "
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RECORD OF NEW SPECIES OF PARASITOIDS ON LARVAE OF Spodoptera frugiperda (J. E. SMITH) (LEPIDOPTERA: NOCTUIDAE) AND Dichomeris famulata MEYRICK (LEPIDOPTERA: GELECHIIDAE) IN MAIZE (Zea mays L.) IN BRAZIL
RAFAEL BRAGA DA SILVA,IVAN CRUZ,MARIA DE LOURDES CORRêA FIGUEIREDO,MARCO AURéLIO BORTONI
Revista Brasileira de Milho e Sorgo , 2012,
Abstract: The knowledge of the flow of parasitoids in cultivation areas is a practice that should be adopted forchoosing a best method for the regulation of pest populations. The aim of this study was to determine the occurrenceof parasitoids associated with larvae of Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) and Dichomerisfamulata Meyrick (Lepidoptera: Gelechiidae) in maize (Zea mays L.) under organic and conventional productionsystem. The experiment was conducted at the National Research Center for Maize and Sorghum (CNPMS) in SeteLagoas, Minas Gerais State, Brazil. Hymenoptera parasitoids emerged from S. frugiperda, including the Ichneumonidae:Campoletis flavicincta, Colpotrochia sp. nov., Eiphosoma laphygmae and Ophion flavidus; the Braconidae speciesChelonus (Chelonus) insularis, Dolichozele koebelei and Exasticolus sp. nov. This is the first report of Colpotrochiasp. nov., Dolichozele koebelei and Exasticolus sp. nov. parasitizing S. frugiperda. From larvae of D. famulata emergedthe Braconidae: Cotesia sp., Glyptapanteles sp., Phanerotoma sp. (Group Fuscovaria) and Chelonus (Microchelonus)sp. nov. (first occurrence in D. famulata).
Does the aggressiveness of the prey modify the attack behavior of the predator Supputius cincticeps (St?l) (Hemiptera, Pentatomidae)?
Silva, Rafael Braga da;Corrêa, Alberto Soares;Della Lucia, Terezinha Maria Castro;Pereira, Alexandre Igor Azevedo;Cruz, Ivan;Zanuncio, José Cola;
Revista Brasileira de Entomologia , 2012, DOI: 10.1590/S0085-56262012005000031
Abstract: does the aggressiveness of the prey modify the attack behavior of the predator supputius cincticeps (st?l) (hemiptera, pentatomidae)? the stink bug supputius cincticeps (st?l) (hemiptera, pentatomidae) is a predator found in several brazilian regions, which possesses desirable attributes as a natural control agent and in biological control programs. the aim of this study was to test if the attack behavior and predation success of s. cincticeps were affected by prey species. larvae of tenebrio molitor (l.) (coleoptera, tenebrionidae), spodoptera frugiperda (j. e. smith) (lepidoptera, noctuidae), and thyrinteina arnobia (stoll) (lepidoptera, geometridae) were offered to s. cincticeps in laboratory bioassays where predatory attack and prey defensive behaviors were observed for 2-hour periods. the attack behavior of s. cincticeps changed with the prey species offered. more than 25% of t. molitor and s. frugiperda larvae were immediately attacked, but t. arnobia was not immediately attacked by s. cincticeps. successful attack (i.e., successful insertion of the predator stylets into the prey) depends on the region of the body attacked, with a greater proportion of successful attacks in the anterior than in the median or posterior regions. larvae of t. arnobia and s. frugiperda displayed a sequence of abrupt head and body movements in response to s. cincticeps attack. attempts of predation were more successful on t. molitor and s. frugiperda than on t. arnobia. information about the differential attack behavior of s. cincticeps on different prey species is important for designing successful biological control programs using this hemipteran predator.
New record of Tetrastichus howardi (Olliff) as a parasitoid of Diatraea saccharalis (Fabr.) on maize
Cruz, Ivan;Redoan, Ana Carolina;Silva, Rafael Braga da;Figueiredo, Maria de Lourdes Corrêa;Penteado-Dias, Angélica Maria;
Scientia Agricola , 2011, DOI: 10.1590/S0103-90162011000200017
Abstract: diatraea saccharalis (fabr.) (lepidoptera: pyralidae) spends the largest part of its life cycle inside the stalk of the host plant,which provides protection against the action of conventional control methods. biological control has been considered a viable alternative to control this pest in sugarcane (saccharum officinarum l.) and corn (zea mays l.), two pest preferential hosts. this paper reports the occurrence in brazil of tetrastichus howardi (olliff) (hymenoptera; chalcidoidea: eulophidae) parasitizing pupae of d. saccharalis obtained from corn plants. it also includes preliminary biological data about the insect. a single female of t. howardi is able to produce up to 66 offspring using a single pupa of the host d. saccharalis and apparently does not distinguish between the host pupae of different ages. the life cycle of the parasitoid was around 25.5 days. the presence of the parasitoid in brazil opens a new perspective on suppression of the sugarcane borer, considering the promising results already obtained in asian countries. the insect is well adapted to laboratory conditions, can be produced in large scale and may became an additional option for the integrated pest management in those crops where d. saccharalis is a key pest such as the sugarcane, corn and sorghum (sorghum bicolor (l.) moench).
Survey of ear flies (Diptera, Ulidiidae) in maize (Zea mays L.) and a new record of Euxesta mazorca Steyskal in Brazil
Cruz, Ivan;Silva, Rafael Braga da;Figueiredo, Maria de Lourdes Corrêa;Penteado-Dias, Angélica Maria;Sarto, Mário César Laboissiérè Del;Nuessly, Gregg Stephen;
Revista Brasileira de Entomologia , 2011, DOI: 10.1590/S0085-56262011000100016
Abstract: survey of ear flies (diptera, ulidiidae) in maize (zea mays l.) and a new record of euxesta mazorca steyskalin brazil. species of euxesta (diptera, ulidiidae), known as silk flies or ear flies, are becoming increasingly important as maize insect pests in south america, although very little is known about them in brazil. the larvae of some species of this genus initially damage female reproductive tissues, and then the developing kernels on the ear. as a result of feeding, fermentation and associated odors cause complete loss of the grain because it is no longer fit for human or livestock consumption. the main objective of this work was to evaluate the incidence of euxesta spp. in brazilian maize fields and to determine the most prevalent species using two different hydrolyzed protein foods attractants, bioanastrepha? (hydrolyzed maize protein) and torula, placed inside mcphail traps. the two species identified were e. eluta loew and e. mazorca steyskal, the latter being a new record from brazil. between the two species, e. eluta was the more abundant in maize fields. both attractants were efficient in capturing the two species. however, bioanastrepha? captured significantly more insects than torula.
NíVEL DE CONTROLE DE Diloboderus abderus EM AVEIA PRETA, LINHO, MILHO E GIRASSOL
Silva, Mauro Tadeu Braga da;Costa, Ervandil Corrêa;
Ciência Rural , 2002, DOI: 10.1590/S0103-84782002000100002
Abstract: the study was carried out in the 1991 and 1992 growing seasons, in cruz alta, rio grande do sul state. the objective was to evaluate the infestation levels of diloboderus abderus sturm, 1826 (coleoptera: melolonthidae) on black oats (avena strigosa l.), flax (linum usitatissimum l.), corn (zea mays l.) and sunflower (helianthus annuus l.) under no-tillage. increasing number of larvae/m2 decreased plant population, plant biomass and yield. control levels were different among the four crops species. results of the insect damage suggested the control level of 12 larvae/m2 in flax, 10 larvae/m2 in black oats, 0.5 larva/m2 in corn and 0.4 larva/m2 in sunflower as indicator for these crops seed treatment with insecticides.
NíVEL DE CONTROLE DE Diloboderus abderus EM AVEIA PRETA, LINHO, MILHO E GIRASSOL
Silva Mauro Tadeu Braga da,Costa Ervandil Corrêa
Ciência Rural , 2002,
Abstract: O estudo aqui relatado foi conduzido nas safras agrícolas de 1991 e 1992, em Cruz Alta, no Rio Grande do Sul. O objetivo foi avaliar o efeito de diferentes níveis de infesta o de Diloboderus abderus Sturm, 1826 (Coleoptera: Melolonthidae) em aveia preta (Avena strigosa L.), em linho (Linum usitatissimum L.), em milho (Zea mays L.) e em girassol (Helianthus annuus L.), no sistema de plantio direto. O aumento do número de larvas/m2 propiciou a ocorrência de danos e, em conseqüência, a diminui o da popula o de plantas, da massa seca da parte aérea e da produtividade. Os níveis de controle obtidos foram variáveis dependendo da cultura. Com base nos danos produzidos pelo inseto, sugerem-se os níveis de controle de 12 larvas/m2 em linho, de 10 larvas/m2 em aveia preta, de 0,5 larva/m2 em milho e de 0,4 larva/m2 em girassol, como indicador para tratamento de sementes destas culturas com inseticidas.
Rea??o de cultivares e eficiência do controle químico de pulg?es vetores do Barley yellow dwarf virus em trigo
Silva, Mauro Tadeu Braga da;Costa, Ervandil Corrêa;Balardin, Ricardo Silveiro;
Ciência Rural , 2004, DOI: 10.1590/S0103-84782004000500003
Abstract: four experiments were carried out in cruz alta, rio grande do sul state, brazil, during the 2000 growing season, under field conditions, to evaluate the wheat cultivars reaction and efficiency of inseticides to reduce aphid vectors in the barley yellow dwarf virus (bydv) incidence and damage. the majority of the aphids collected (75%) was rhopalosiphum padi (linnaeus). other three species of aphids were collected in lower numbers (25%). only the fundacep 31 cultivar showed positive reaction to sorological test elisa, confirming the presence of bydv-pav, bydv-mav and bydv-sgv viral species. cultivars showed different responses, being classified as resistant (fundacep 30, fundacep 36 and fundacep 37) and susceptible (fundacep 31). seed treatment with imidacloprid and thiamethoxam in the dosage of 24.5g 100kg of seed-1, were effective to control bydv aphid vectors, and these treatments were better than conventional 3 foliar sprays with chlorpyriphos. dosages over 8.5g 100kg of seed-1 of imidacloprid and thiamethoxam avoided reduction in grain yields in wheat caused by the complex aphids-bydv.
Controle de Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae) com reguladores de crescimento de insetos
Silva, Mauro Tadeu Braga da;Costa, Ervandil Corrêa;Boss, Adriano;
Ciência Rural , 2003, DOI: 10.1590/S0103-84782003000400002
Abstract: the velvetbean caterpillar, anticarsia gemmatalis hübner (lepidoptera: noctuidae), is an important soybean pest in brazil. this study aimed to evaluate growth regulators insecticides. a precision sprayer equipped with 110 02 nozzles, working at a constant pressure of 1 bar and volume of 100 liters per hectare was used to apply the insecticide treatments (diflubenzuron at 15g a.i. per hectare, lufenuron at 7.5 g a.i. per hectare, metoxyfenozide at 21.6g a.i. per hectare and teflubenzuron at 7.5g a.i. per hectare). applications when plants were 0.90m height, in the r3.1 growth stage, and the number of small larvae was 95, while that of large larvae was 33 per two meters of row. the number of live larvae at 0, 2, 4, 7 and 10 days after application, the defoliation at 15 days after application and grain yield were evaluated. the fastest control of large and small larvae was obtained with metoxyfenozide at 2 days after application. the insecticides diflubenzuron, lufenuron and teflubenzuron efficiently controlled of large and small larvae, but only at 4 days after application. larval infestations in non-treated plots resulted in significant defoliation and yield losses when compared to plots treated with insecticides.
Rea o de cultivares e eficiência do controle químico de pulg es vetores do Barley yellow dwarf virus em trigo
Silva Mauro Tadeu Braga da,Costa Ervandil Corrêa,Balardin Ricardo Silveiro
Ciência Rural , 2004,
Abstract: Foram conduzidos em Cruz Alta, RS, no ano agrícola de 2000, quatro experimentos, em condi es de campo, para avaliar a rea o de cultivares de trigo e a eficiência de inseticidas, quanto à incidência de pulg es transmissores do Barley yellow dwarf virus (BYDV) e seus danos às plantas. A maioria dos pulg es coletados (75%) foi Rhopalosiphum padi (Linnaeus). Outras três espécies de pulg es foram coletadas em número menor (25%). Apenas para a cultivar Fundacep 31, o teste de ELISA confirmou a presen a dos vírus BYDV-PAV, BYDV-MAV e BYDV-SGV. As cultivares apresentaram respostas distintas, sendo agrupadas como resistentes (Fundacep 30, Fundacep 36 e Fundacep 37) e suscetível (Fundacep 31). Os inseticidas imidacloprida e tiametoxam na dosagem de 24,5g 100kg de sementes-1, aplicados nas sementes, foram eficazes no controle dos pulg es vetores de BYDV, superando a a o de três aplica es do clorpirifós na parte aérea. Dosagens a partir de 8,5g 100kg de sementes-1 de imidacloprida e tiametoxam evitaram perdas em produtividade de trigo causada pelo complexo pulg es-BYDV.
Controle de Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae) com reguladores de crescimento de insetos
Silva Mauro Tadeu Braga da,Costa Ervandil Corrêa,Boss Adriano
Ciência Rural , 2003,
Abstract: A lagarta-da-soja, Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae), é uma praga importante na cultura da soja no Brasil. Este estudo teve como objetivo avaliar diferentes inseticidas, reguladores de crescimento, para o controle dessa praga. Os inseticidas diflubenzuron (15g i.a. ha-1), lufenuron (7,5g i.a. ha-1), metoxifenozide (21,6g i.a. ha-1) e teflubenzuron (7,5g i.a. ha-1) foram aplicados com pulverizador costal de precis o, equipado com pontas tipo leque 110, 02, numa press o de 1 bar e volume de calda de 100l ha-1. No dia da aplica o dos inseticidas, as plantas de soja (cv. Fundacep 33) estavam com 0,90m de altura, no estádio R3.1, e infesta o média de 95 lagartas pequenas e de 33 lagartas grandes por dois metros de fileira. A eficiência dos inseticidas foi determinada através da contagem do número de lagartas vivas pequenas e grandes aos 0, 2, 4, 7 e 10 dias após a aplica o (DAA); da percentagem de desfolha aos 15 DAA e da produ o de gr os. Foi observado efeito de choque do inseticida metoxifenozide tanto em lagartas pequenas quanto em grandes. Os inseticidas diflubenzuron, lufenuron e teflubenzuron controlaram eficientemente as lagartas a partir de 4 DAA. As infesta es de lagartas nas parcelas testemunhas aumentaram a desfolha em 75,8% e reduziram produtividade para 2371 kg ha-1. Nas parcelas tratadas com inseticidas desfolha variou de 34,7% a 50,7% e a produtividade entre 3255kg ha-1 e 3585kg ha-1.
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