scholarly journals Identification of sources of resistance of Passiflora rootstocks to fusariosis in areas with disease outbreaks in Mato Grosso state, Brazil

2021 ◽  
Vol 43 (4) ◽  
Author(s):  
Dulândula Silva Miguel-Wruck ◽  
Givanildo Roncatto ◽  
Maurel Behling ◽  
Valeria de Oliveira Faleiro ◽  
Solange Maria Bonaldo ◽  
...  
Keyword(s):  
Block Design ◽  
Disease Outbreaks ◽  
Mortality Rates ◽  
Sources Of Resistance ◽  
Mato Grosso ◽  
Randomized Block Design ◽  
Fusarium Sp ◽  
Moderate Resistance ◽  
Disease Foci ◽  
Overall Mortality

Abstract The aim of the study was to identify sources of resistance of Passiflora rootstocks to Fusarium sp. in two experimental areas with histories of disease foci in Mato Grosso state, Brazil. The experiment was carried out from June 2012 to December 2015 and was of randomized block design with eight treatments in which susceptible cultivar P. edulis was grafted onto hybrids CPAC MJ-H-87, CPAC MJ-H-76, CPAC MJ-H-86 and CPAC MJ-H-88, the commercial cultivar and native P. edulis, P. nitida and P. alata. Mortality rates of grafted plants were evaluated up to 640 days after transplantation. All Fusarium sp. isolates were identified as F. oxysporum f. sp. passiflorae. Plant mortality occurred earlier in the clay area than in the area with sandy clay loam. Grafted plants involving P. edulis as rootstocks were highly susceptible to Fusarium sp. with overall mortality rates above 56.25% considering both soil types, while plants with CPAC MJ-H-76 or native P. nitida rootstocks were more resistant with mortality rates below 12.5%. Grafted plants with CPAC MJ-H-86 as rootstock were highly resistant in clay soil but highly susceptible in soil with high proportion of sand. Only grafted plants involving CPAC MJ-H-76 as rootstock showed moderate resistance.

scholarly journals Okra seedlings production in protected environment, testing substrates and producing fruits in field

2013 ◽  
Vol 31 (1) ◽  
pp. 08-14 ◽  
Author(s):  
Edilson Costa ◽  
Taynara G de Souza ◽  
Gleciane de L Benteo ◽  
Katiane SS Benett ◽  
Cleiton GS Benett
Keyword(s):  
Block Design ◽  
Joint Analysis ◽  
State University ◽  
Mato Grosso ◽  
Randomized Block Design ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Hot Weather ◽  
Favorable Conditions ◽  
Mato Grosso Do Sul

The okra grows well in hot weather, finding favorable conditions for development in Brazil. We evaluated the production of okra seedlings and productivity. The experiment was conducted in the experimental area of the State University of Mato Grosso do Sul, in Aquidauana. In the seedling phase we tested substrates (100% triturated cassava stems, 75% triturated cassava stems and 25% vermiculite, 50% triturated cassava stems and 50% vermiculite, 25% triturated cassava stems and 75% vermiculite and 100% vermiculite). These substrates were placed in two protected environments (nursery with black screen, 50% of shading, and aluminized screen, 50% of shading). Each environment was considered an experiment conducted in completely randomized design with eight replications. After that we realized joint analysis. In the field, a total of 10 treatments generated from combinations of environments and substrates (2 environments x 5 substrates) were distributed in a randomized block design with four replications. The average proportions of cassava stems and vermiculite may be suitable for okra seedlings. The results of shoot and total dry phytomass indicate that the aluminized screen can be recommended for okra seedlings production when the substrate with a 1:1 ratio is used. Seedlings grown on higher percentages of vermiculite anticipate production, while seedlings produced only in cassava stems tend to slow it down. The aluminized screen tends to increase the yield of okra seedlings. Average proportions of vermiculite and cassava stems for seedling production under aluminized screen, provide more fruits and yield of okra in Aquidauana.

scholarly journals DÉFICIT HÍDRICO NAS FASES VEGETATIVA E DE FLORAÇÃO DA PIMENTA ‘TABASCO’ EM AMBIENTE PROTEGIDO

Irriga ◽  
2018 ◽  
Vol 21 (3) ◽  
pp. 561
Author(s):  
Lígia Borges Marinho ◽  
José Antonio Frizzone ◽  
João Batista Tolentino Junior ◽  
Janaína Paulino ◽  
José Monteiro Soares ◽  
...  
Keyword(s):  
Water Consumption ◽  
Deficit Irrigation ◽  
Block Design ◽  
Capsicum Frutescens ◽  
Flowering Stage ◽  
Mato Grosso ◽  
Randomized Block Design ◽  
Start Up ◽  
E Mail

DÉFICIT HÍDRICO NAS FASES VEGETATIVA E DE FLORAÇÃO DA PIMENTA ‘TABASCO’ EM AMBIENTE PROTEGIDOLÍGIA BORGES MARINHO 1; JOSÉ ANTONIO FRIZZONE2; JOÃO BATISTA TOLENTINO JUNIOR3; JANAÍNA PAULINO4; JOSÉ MONTEIRO SOARES5 E FRANCISCO NOGUEIRA VILAÇA6*Artigo extraído da tese do primeiro autor1 Enga. Agrônoma, Doutora, Profa. Departamento Tecnologia e Ciências Sociais, Universidade do Estado da Bahia, av. Edgard Chastinet, São Geraldo, CEP 48905-680, Juazeiro, BA. Fone (74) 3611-7363. E-mail: [email protected] Eng. Agrônomo, Doutor, Prof. Departamento de Engenharia de Biossistemas/Escola Superior de Agricultura “Luiz de Queiroz” USP, Av. Pádua Dias, 11, CEP 13.418-900, Piracicaba/SP, E-mail(s): [email protected];3 Eng. Agrônomo, Doutor, Prof. Campus Curitibanos, Universidade Federal de Santa Catarina, Curitibanos, SC. E-mail: [email protected] Enga. Agrícola, Doutora, Profa. Universidade Federal de Mato Grosso UFMT, campus Sinop, Avenida Alexandre Ferronato Nº 1.200. Bairro: Setor Industrial. CEP: 78.550-000, Sinop-MT, Email: [email protected] Eng. Agrônomo, Doutor, Pesquisador EMBRAPA/CPATSA, BR 428, Km 152, Zona Rural, Caixa Postal 23, CEP: 56310-000, Petrolina, PE, E-mail: [email protected] Eng. Agrônomo, Mestre. Departamento de Engenharia de Biossistemas/Escola Superior de Agricultura “Luiz de Queiroz” USP, Av. Pádua Dias, 11, CEP 13.418-900, Piracicaba/SP, E-mail: [email protected] RESUMOA escassez de recursos hídricos no Brasil tem impulsionado a demanda de manejo de irrigação mais eficiente nas propriedades agrícolas, visando reduzir o consumo de água e tornar o seu uso mais eficiente. O objetivo foi avaliar o efeito do déficit hídrico em diferentes fases do cultivo da pimenteira na eficiência de uso de água, na produtividade e na qualidade da pimenta ‘Tabasco’ cultivada em ambiente protegido, durante os meses de setembro de 2009 a julho de 2010, no município de Piracicaba-SP. O delineamento foi em blocos casualizados, com lâminas de irrigação de 40, 60, 80 e 100% da evapotranspiração da cultura (ETc), inicializadas nas fases vegetativa e de floração. O déficit de irrigação influenciou a produtividade da pimenta e o mesmo não foi observado para a qualidade física da pimenta. A eficiência do uso da água da pimenta Tabasco não foi influenciada pelo déficit. Entretanto, o déficit hídrico inicializado na fase de floração permitiu economia de água de até 50,1% de água no ciclo de 208 dias após transplantio.Palavras-chave: Estresse hídrico, Capsicum frutescens, produtividade e qualidade do fruto.MARINHO, L. B.; FRIZZONE, J. A.; TOLENTINO JÚNIOR, J. B.; PAULINO, J.; SOARES, J. M.; VILAÇA, F. N.WATER DEFICIT APPLIED IN VEGETATIVE AND FLOWERING STAGE OF ‘TABASCO’ PEPPER IN GREENHOUSE2 ABSTRACTThe scarcity of water resources in Brazil has driven the management of demand for more efficient irrigation in farms in order to reduce water consumption and make its use more efficient. The objective of this study was to evaluate the water deficits’ effect at the vegetative and flowering stages of pepper in water use efficiency, yield and quality of pepper cv. 'Tabasco'(Capsicum frutescens) grown in a greenhouse from September 2009 to July 2010. The experiment was conducted as randomized block design with irrigation levels of 40, 60, 80 and 100% of Crop Evapotranspiration (ETc), beginning at vegetative and flowering stages. There was a significant effect of full and deficits irrigation started at vegetative and flowering stages on the fruit number per plant, and the linear model was the best fitted. The average of mass fruit per plant did not vary with the deficit, not even with the start up times. The deficit irrigation affected pepper productivity, yet it was not observed on the physical quality of fruits. The deficit irrigation (40% ETc) beginning at flowering stage allowed savings of up to 49.8% in water consumption in a cycle of 208 days after transplanting.Keywords: water stress, Capsicum frutescens, productivity and fruit quality.

scholarly journals NITROGEN RATES AND RESIDUAL EFFECT OF CO-INOCULATION OF SOYBEAN ON MAIZE PLANTS

2020 ◽  
Vol 33 (3) ◽  
pp. 633-643
Author(s):  
AUREANE CRISTINA TEIXEIRA FERREIRA CÂNDIDO ◽  
MARCO ANTONIO CAMILLO DE CARVALHO ◽  
RICARDO ADRIANO FELITO ◽  
ADRIANO MALTEZO DA ROCHA ◽  
OSCAR MITSUO YAMASHITA
Keyword(s):  
Block Design ◽  
Residual Effect ◽  
Dry Weight ◽  
N Fertilizer ◽  
State University ◽  
Mato Grosso ◽  
Randomized Block Design ◽  
Maize Plants ◽  
Soybean Plants ◽  
Fertilizer Rates

ABSTRACT Co-inoculation consists of using microorganism combinations with synergic effect that surpass the results obtained with their use alone. The objective of this work was to evaluate the effect of inoculation and co-inoculation on soybean plants, and their residual effect on maize plants grown intercropped with ruzigrass (Urochloa ruziziensis), under different N fertilizer rates. The experiment was conducted at the experimental area of the Mato Grosso State University, Alta Floresta campus, in a Typic Hapludox. A randomized block design was used for the soybean crops; the treatments consisted of Bradyrhizobium japonicum inoculated single, or co-inoculated with Azospirillum brasilense, with 20 replications. A randomized block design in a strip-plot arrangement was used for the winter maize-ruzigrass intercrop (WMRI); the treatments consisted of combination of residual effect of inoculation and co-inoculation in the strips, and five N fertilizer rates (0, 50, 100, 150, and 200 kg ha-1) in plots with WMRI, with four replications. The co-inoculation of soybean seeds and its residual effect on the maize crops increased the root dry weight of plants of both crops; however, no increases were found for most vegetative and reproductive characteristics of maize plants. Yield and most characteristics evaluated had increasing linear responses to increases in N rates, indicating the plants could respond to rates above 200 kg ha-1.

scholarly journals Correlation between Qualitative Characteristics and Genotype Resistance of Local and Introduced Pepper Varieties Against Anthracnose Disease

2020 ◽  
Vol 3 (1) ◽  
pp. 43
Author(s):  
Siti Hafsah ◽  
Firdaus Firdaus
Keyword(s):  
Block Design ◽  
Stem Diameter ◽  
Stem Length ◽  
Skin Thickness ◽  
Fruit Length ◽  
Randomized Block Design ◽  
Randomized Design ◽  
High Heritability ◽  
Diversity In Stem ◽  
Moderate Resistance

This study was aimed at obtaining information related to genetic parametric against anthracnose diseases caused by Colletotrichum capsici, which attacked several pepper genotypes. The research was conducted in a net house at the Faculty of Agriculture, Universitas Syiah Kuala, Banda Aceh, from July to December 2017, and it was divided into two experiments: 1) planting the peppers which carried out in a net house. This experiment employed Randomized Block Design (RBD) Non-Factorial and 2) anthracnose resistance assay.  This assay applied using Completely Randomized Design (CRD) Non-Factorial with the only factor observed: 11 pepper genotypes (IPBC15, IPBC15D2, IPBC15D3, IPBC15D4, Udeng, Lamando Lapaben, Super Amando, Lanyoe, Lado F1, Kastilo F1, and PM999 F1), with three replications. The results showed that the genotypes IPBC15, IPBC15D2, IPBC15D4, Udeng, Lamando Lapaben, Lado F1 exhibited moderate resistance, while genotypes IPBC15D3, Super Amando, Lanyoe, Kastilo F1 and PM999 F1 were susceptible to the disease. The wide variety of genetic and high heritability was found in stem length, flowering age, length of fruit stalk, fruit length, fruit diameter, and skin thickness, while narrow and moderate genetic variability was found in stem diameter and harvest age. The coefficient of genetic diversity in stem length, length of fruit stalk, and fruit length was found to be moderate and expressed low diversity in stem diameter, flowering age, and skin thickness. Stem diameter and skin thickness also showed a negative correlation to disease severity.

scholarly journals Effectiveness of Secondary Metabolites from Entomopathogenic Fungi for Control Nilaparvata lugens Stål. in the Laboratory Scale

2021 ◽  
Vol 25 (1) ◽  
pp. 86
Author(s):  
Endang Warih Minarni ◽  
Loekas Soesanto ◽  
Agus Suyanto ◽  
Rostaman Rostaman
Keyword(s):  
Secondary Metabolites ◽  
Crop Yields ◽  
Block Design ◽  
Brown Planthopper ◽  
Nilaparvata Lugens ◽  
Crop Failure ◽  
Randomized Block Design ◽  
Fusarium Sp ◽  
Aspergillus Sp ◽  
Nilaparvata Lugens Stål

Nilaparvata lugens Stål. is an essential pest in rice plants. This pest attack can reduce crop yields and even crop failure. This research was conducted to obtain secondary metabolites that are effective in controlling brown planthopper (BPH). A randomized block design was used to test the effectiveness of secondary metabolites against BPH. The treatments tested were secondary metabolites produced by eight isolates of fungi consist of three concentrations: 5, 10, and 15%. Water and imidacloprid insecticide were used as control. The eight isolates were: J11 (Aspergillus sp.), J22 (Lecanicillium saksenae), J34 (Myrothecium sp.), J35 (Beauveria sp.), J41 (Fusarium sp.), J56 (Fusarium sp), J60 (Simplicillium sp.), and J65 (Curvularia sp.). Each treatment was repeated three times. The variables observed were mortality and time of death of BPH. Data were analyzed using the F test and followed by a DMRT if significant differences existed. The results showed that the secondary metabolites of the Lecanicillium saksenae, Myrothecium sp., and Simplicillium sp. fungi effectively controlled BPH pests by 80‒100% within 3.22‒5.47 days. The fungus L. saksenae, Myrothecium sp., and Simplicillium sp. contain insecticidal compounds, clogging the insect spiraculum, antifeedant, repellant, and antimicrobial.

scholarly journals Identification of sources of resistance in sorghum to Peronosclerospora sorghi

2005 ◽  
Vol 30 (5) ◽  
pp. 522-524 ◽  
Author(s):  
Flavia C. R Barbosa ◽  
Carlos R Casela ◽  
Ludwig H Pfenning ◽  
Fredolino G Santos
Keyword(s):  
Experimental Design ◽  
Natural Infection ◽  
Block Design ◽  
Systemic Infection ◽  
Sources Of Resistance ◽  
Single Row ◽  
Susceptible Line ◽  
Peronosclerospora Sorghi ◽  
Randomized Block Design ◽  
Sorghum Genotypes

The main objective of this work was to identify sources of resistance in sorghum (Sorghum bicolor) to Peronosclerospora sorghi, the causal agent of downy mildew, through the evaluation of 42 sorghum genotypes under natural infection in the field. Genotypes were planted in single row plots between two rows of the susceptible line SC283, planted 30 days before, to act as spreader rows, in two separate nurseries. The experimental design was a completely randomized block design with three replications. Sorghum genotypes CMSXS156, CMSXS157, CMSXS243, TxARG-1, 8902, 9902054, 9910032, 9910296, Tx430, QL-3, SC170-6-17, CMSXS762 and BR304 were classified as highly resistant in both nurseries. Among these, SC170-6-17 and 9910296 showed 0% systemic infection. Results indicated the possible occurrence of different pathotypes of P. sorghi in the two nurseries.

scholarly journals Joint use of fungicides, insecticides and inoculants in the treatment of soybean seeds

Revista CERES ◽  
2017 ◽  
Vol 64 (3) ◽  
pp. 258-265 ◽  
Author(s):  
Yara Cristiane Buhl Gomes ◽  
Flávio Carlos Dalchiavon ◽  
Franciele Caroline de Assis Valadão
Keyword(s):  
Block Design ◽  
Crop Productivity ◽  
Soybean Seeds ◽  
Mato Grosso ◽  
Foliar N ◽  
Seed Inoculation ◽  
Joint Application ◽  
Randomized Block Design ◽  
The Masses ◽  
Bradyrhizobium Spp

ABSTRACT The interference of the joint application of pesticides with seed inoculation on the survival of Bradyrhizobium has been reported in the last years. So, the objective of this study was to evaluate the joint use of fungicides, insecticides and inoculant in the treatment of soybean seeds on various parameters of Bradyrhizobium nodulation in soybean as well as on crop productivity parameters. The experiment was conducted during the 2013/2014 crop in the experimental field of the Instituto Federal de Educação, Ciência e Tecnologia de Mato Grosso - Campo Novo do Parecis Campus. The seeds of TMG 133 RR variety were sown in pots. It was used a randomized block design in a 4 x 4 + 1 factorial, four fungicides (1: fludioxonil + metalaxyl-M, 2: carboxine + thiram, 3: difeconazole and 4: carbendazim + thiram), four insecticides (1: fipronil 250 SC, 2: thiamethoxam, 3: imidacloprid + thiodicarpe and 4: imodacloprid 600 FC) and an inoculant (SEMIA 5079 and SEMIA 5080), common to all treatments, with three replications. The experiment was not repeated. The joint application of fungicide and insecticide with inoculant does not affect nodulation, foliar N content and vegetative growth of the plants as well as the masses of grains per plant and 100-grain mass. The use of the carbendazim + thiram mixed with fipronil and carbendazim + thiram mixed with imidacloprid provides less number of pods per plant and grains per plant, reflecting in reductions in the production of soybean grains. In this way, the fungicide carbendazim + thiram, regardless of the combined applied insecticide, is the most harmful to Bradyrhizobium spp.

scholarly journals YIELD COMPONENTS AND PRODUCTIVITY OF MAIZE AS A FUNCTION OF PREDECESSOR CROP

2020 ◽  
Vol 19 ◽  
pp. 10
Author(s):  
MARÍA EMILIA BRUSQUETTI GONZÁLEZ ◽  
IZAIAS RODRIGUES DA SILVA JUNIOR ◽  
LUIZ CARLOS FERREIRA DE SOUZA
Keyword(s):  
Grain Yield ◽  
Growth And Development ◽  
Dry Matter ◽  
Pennisetum Glaucum ◽  
Block Design ◽  
Maize Crop ◽  
Mato Grosso ◽  
Randomized Block Design ◽  
Sunn Hemp ◽  
Long Term Experiment

Succession crops in no-tillage system can improve the soil attributes, thus favoring the growth and development of maize (Zea mays L.) and contributing to grain yield increment. The objective of this work was to verify the effect of succession crops on growth and development of maize planted in the summer and the influence on grain yield. For the study, a long-term experiment was implemented, beginning in September 2009, in dystroferric Red Latosol, on the Experimental Farm of the School of Agricultural Sciences of the Federal University of Grande Dourados (UFGD), located in the municipality of Dourados, Mato Grosso do Sul state. This article presents data collected from the 2017/2018 crop season. Randomized block design was used, with ten treatments and four replications. The treatments consisted of the crops preceding maize, such as millet (Pennisetum glaucum L.), oilseed rape (Brassica napus), oat (Avena sativa), safflower (Carthamus tinctorious), niger (Guizothia abyssinica), vetch (Vicia sativa), sunn hemp (Crotalaria juncea), and forage radish (Raphanus sativus). The predecessor crops positively influence dry matter mass of the aerial part of the plant, dry matter mass of 1000 grains, and productivity of the summer maize crop planted through the remains of straw (residues) of millet, oat, niger, sunn hemp, vetch and forage radish.

scholarly journals População de plantas e desempenho produtivo de híbridos de milho oriundos de sementes com diferentes níveis de vigor

2016 ◽  
Vol 11 (2) ◽  
pp. 01
Author(s):  
Danilo Henrique Rodrigues da Silva ◽  
Géri Eduardo Meneghello ◽  
Sandro de Oliveira ◽  
Jerffeson Araújo Cavalcante ◽  
Lilian Madruga Tunes
Keyword(s):  
Block Design ◽  
Plant Population ◽  
Seed Vigor ◽  
Corn Hybrids ◽  
Yield Performance ◽  
Mato Grosso ◽  
Maize Hybrids ◽  
Randomized Block Design ◽  
Final Yield ◽  
And Performance

<p>As relações entre o vigor e desempenho de sementes são bastante contraditórias. Para espécies produtoras de grãos e hortaliças, os efeitos do vigor da semente podem ser expressos na emergência, no crescimento inicial, e no desenvolvimento, com impactos na produtividade final. No entanto, o dimensionamento desta persistência pode não ser evidente em todas as fases, sendo mais comum na emergência. Assim, objetivou-se avaliar os efeitos do vigor de sementes de milho no estabelecimento e desempenho produtivo dos híbridos 502 e 810. O experimento foi conduzido na Fazenda Rancho Alegre, em Itiquira, Mato Grosso (520 m de altitude). Empregou-se o delineamento em blocos ao acaso, em esquema fatorial 2×3, sendo dois híbridos de milho (BM502 e BM810) e três níveis de vigor (alto, médio e baixo), com quatro repetições. A semeadura foi realizada com semeadora manual a 2,5 cm de profundidade e com espaçamento de 0,5 metros entre linhas. As parcelas foram constituídas por 6 linhas de 5 m, sendo que apenas 2 linhas foram utilizadas como área útil para as avaliações. Foi avaliado a população de plantas/ha, produtividade de grãos/ha e produção por planta. O nível de vigor das sementes de híbridos de milho BM502 e BM810 não interfere no estabelecimento do estante inicial e na produção de grãos por planta. O aumento do vigor ocasiona aumento na produtividade dos híbridos de milho.</p><p align="center"><strong><em>Plant population and yield performance of corn hybrids derived from seeds with different levels of force</em></strong></p><p><strong>Abstract</strong><strong>: </strong>Abstract: The relationship between seed vigor and performance are quite contradictory. For species that produce grains and vegetables, the effects of seed vigor can be expressed in the emergence, early growth, and development, with impacts on final yield. It aimed to evaluate the effects of the vigor of corn seeds in the establishment and yield performance of the hybrid 502 and 810. The experiment was conducted in Rancho Alegre Farmin Itiquira, Mato Grosso (520 m altitude). We used the design in a randomized block design in a 2 × 3 factorial design, with two maize (BM502 and BM810) and three force levels (high, medium and low), with four replications. The seeding was done with manual seeder 2,5 cm deep and spaced 0,5 meters between rows. The plots were 6 rows of 5 m, with only two lines were used as useful for evaluations area. Plant population há-1, seed yield / ha and yield per plant was evaluated. The level of seed vigor of maize hybrids BM502 and BM810 does not interfere in the establishment of the initial stand and grain yield per plant. The increase in force results in an increase in the productivity of maize hybrids.</p>

scholarly journals Sources of black aphid resistance in the cowpea

2018 ◽  
Vol 12 (4) ◽  
pp. 328
Author(s):  
Valéria Ramos Lourenço ◽  
Alfredo Mendonça De Sousa ◽  
Antonia Débora Camila de Lima Ferreira ◽  
Ervino Bleicher ◽  
Cândida Hermínia Campos de Magalhães Bertini
Keyword(s):  
Block Design ◽  
Resistance Mechanism ◽  
Breeding Programs ◽  
High Genetic Variability ◽  
Genetic Breeding ◽  
Randomized Block Design ◽  
Old Adult ◽  
Aphis Craccivora Koch ◽  
Moderate Resistance ◽  
Pot Plants

For a variety of agronomic reasons, landraces have strategic importance for cowpea Vigna unguiculata (L.) Walp. genetic breeding programs. The aim of the current research was to identify black aphid, Aphis craccivora Koch resistance in cowpea landraces. Twenty-three landraces from different regions of the state of Ceará, Brazil, were compared to four literature-cited standards: BRS Guariba and TVu 408 P2 (resistant); BR 17-Gurguéia and VITA 7 (susceptible). Experiments were conducted in a greenhouse located at Campus do Pici, Universidade Federal do Ceará, in Fortaleza, Ceará state, Brazil. A completely randomized block design was used, with six replicates, each composed of one plant in a 300 mL pot. Plants were individually infested with five six-day-old adult insects. Adults were subsequently evaluated two days after infestation and nymphs at four days. Six landraces were highly resistant (Um-named 1-DIP, Feijão de arrancada, Feijão moitinha, Feijão de moita, Cara preta and Roxim miúdo) to levels compatible to the BRS Guariba standard. Three other landraces (Feijão da Bahia, Cojó and Feijão da Consuelo Rocha) showed moderate resistance, similar to the TVu 408 P2 standard. In addition to the high genetic variability found in the landraces, antibiosis was the main resistance mechanism observed.

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