Avaliação de bactérias endofíticas para o controle biológico da mancha foliar de Exserohilum turcicum em milho / Assessing of endophytic bacteria for biological control of northern corn leaf blight (Exserohilum turcicum)

A eficácia de nove isolados de bactérias endofíticas foi avaliada no biocontrole da mancha foliar de Exserohilum turcicum, pela microbiolização das sementes e da parte aérea do milho híbrido AS-1548 (72 e 24 horas antes e no mesmo dia da inoculação do patógeno) em condições de casa de vegetação. Verificou-se que Bacillus subtilis 0G, Bacillus lentimorbus, Streptomyces sp. e Bacillus agaradhaerens se destacaram dos demais, quando aplicados na parte aérea, em todos os intervalos testados, com um controle na ordem de 42 a 61%. Quando as bactérias foram aplicadas nas sementes, Bacillus lentimorbus, Streptomyces sp., Ewingella americana e Xanthomonas axonopodis foram os mais eficientes, com um controle entre 37 e 59%.(AU)

The efficacy of nine endophytic bacterial strains was evaluated on biocontrol of northern corn leaf blight (Exserohilum turcicum), by microbiolization of seeds and aerial parts of maize, hybrid AS-1548 (72 and 24 hours before and at same day of the pathogen inoculation) in greenhouse conditions. It was found that Bacillus subtilis 0G, Bacillus lentimorbus, Streptomyces sp. and Bacillus agaradhaerens highlighted from the others, when applied on aerial parts of maize, in all intervals tested, presenting control in order of 42 to 61%. When the bacteria were applied on seeds, Bacillus lentimorbus, Streptomyces sp., Ewingella americana and Xanthomonas axonopodis showed more efficiency, presenting control between 37 and 59%.(AU)

Composição mineral de substratos à base de resíduos de bananeira durante o cultivo de Pleurotus ostreatus / Mineral composition of substrates based on banana waste during the Pleurotus ostreatus cultivation

O objetivo deste trabalho foi avaliar a composição mineral (macro e micronutrientes) dos substratos [(inicial e residual (pós-colheita)] à base de diferentes combinações de resíduos (folha, pseudocaule e pseudocaule + folha) e cultivares de bananeira - Musa spp. (Thap Maeo, Prata Anã, Pelipita e Caipira), durante 49 dias de cultivo da linhagem POS 09/100 de Pleurotus ostreatus. Verificaram-se que todos os substratos à base de resíduos de diferentes cultivares de bananeira apresentaram quantidades satisfatórias de nutrientes para o cultivo de P. ostreatus, tanto na fase inicial de cultivo como na final.(AU)

The objective of this study was to evaluate the mineral composition (macro e micronutrients) of the substrates [initial and residual (postharvest)] based on different combinations of waste (leaf, pseudo-stem and pseudo-stem + leaf) and banana cultivars - Musa spp. (Thap Maeo, Prata Anã, Pelipita and Caipira) during 49 days for the cultivation of POS 09/100 strain of P. ostreatus. It was verified that all of the substrates based on different combinations of waste and banana cultivars presented satisfactory amounts of nutrients for the cultivation of P. ostreatus, both in the initial phase of cultivation and in the end.(AU)

Dynamics of the chemical composition and productivity of composts for the cultivation of Agaricus bisporus strains

Two compost formulations based on oat straw (Avena sativa) and brachiaria (Brachiaria sp.) were tested for the cultivation of three Agaricus bisporus strains (ABI-07/06, ABI-05/03, and PB-1). The experimental design was a 2 x 3 factorial scheme (composts x strains) with 6 treatments and 8 repetitions (boxes containing 12 kg of compost). The chemical characterization of the compost (humidity, organic matter, carbon, nitrogen, pH, raw protein, ethereal extract, fibers, ash, cellulose, hemicellulose, and lignin) before and after the cultivation of A. bisporus and the production (basidiomata mass, productivity, and biological efficiency) were evaluated. Data were submitted to variance analysis, and averages were compared by means of the Tukey's test. According to the results obtained, the chemical and production characteristics showed that the best performances for the cultivation of A. bisporus were presented by the compost based on oat and the strain ABI-07/06.

Applicability of the use of waste from different banana cultivars for the cultivation of the oyster mushroom

The objective of this research was to evaluate the oyster mushroom Pleurotus ostreatus- (Jacq.: Fr.) Kumm. cultivation in substrates based on different combinations of wastes (leaf, pseudo-stem and pseudo-stem + leaf) and banana cultivars - Musa spp. (Thap Maeo, Prata Anã, Pelipita and Caipira) during 49 days. Organic matter loss in the substrate by action of the fungus was also evaluated during that period. It was verified that the pseudo-stem waste provided the best averages of biological efficiency among all cultivars tested and best rates were obtained by Thap Maeo (61.5%). The highest organic matter loss (OML) was obtained from pseudo-stem + leaf wastes (Prata Anã - 78.6%; Thap Maeo - 67.6%; Pelipita - 64.8%; Caipira - 60.6%). Therefore, the use of those wastes showed itself viable for P. ostreatus cultivation due to its availability and low cost, besides decreasing discards to environment.

Yield of four Agaricus bisporus strains in three compost formulations and chemical composition analyses of the mushrooms / Produção de quatro linhagens de Agaricus bisporus em três formulações de compostos e análises bromatológicas dos cogumelos produzidos

Three compost formulations, consisting of two varieties of Cynodom dactylon (L.) Pers. (Coast-cross and Tyfton) and oat (Avena sativa) straw were tested for the cultivation of A. bisporus strains ABI-01/01, ABI-04/02, ABI-05/03, and ABI-06/04. A completely randomized experimental design in a factorial scheme was adopted, with 12 treatments (4 A. bisporus strains × 3 types of compost) and 8 replicates. Each experimental unit corresponded to one box containing 12 12.5 kg fresh wet compost. The data were submitted to analysis of variance and the means were compared by Tukey test. According to the results, productivity of mushrooms was influenced by strain and/or compost type. It was also verified that crude protein, ash, and crude fiber contents in the mushroom varied with A. bisporus strain and straw used in the formulation of the compost.

Três formulações de composto, à base de palhas de Cynodom dactylon (L.) Pers. (cultivares Coast-cross e Tyfton) e Aveia-Avena sativa, foram testadas no cultivo das linhagens ABI-01/01, ABI-04/02, ABI-05/03 e ABI-06/04 de A. bisporus. O delineamento experimental foi em esquema fatorial, inteiramente casualizado com 12 tratamentos (4 linhagens de A. bisporus x 3 tipos de composto) e 8 repetições. Cada unidade experimental constou de uma caixa com 1212,5 kg de composto fresco úmido. Os dados foram submetidos à análise de variância e as médias foram comparadas pelo teste de Tukey. De acordo com os resultados obtidos verificou-se que a produção de cogumelos foi influenciada pela linhagem e/ou pelo tipo de composto. Também verificou-se que o teor de proteína bruta, cinzas e fibra bruta de basidiomas variou com a linhagem de A. bisporus e com o tipo de palha utilizada na formulação do composto.

Thermal and mechanical shocks affecting the first flush of production of Lentinula edodes on Eucalyptus saligna logs

The aim of this work was to evaluate the effect of thermal and mechanical shocks on the productivity of Lentinula edodes colonized on 140 Eucalyptus saligna logs at different immersion times in water and in the first flush of production. The logs were immersed in water at low temperature (16°C) or environmental temperature (22°C), for 6, 10, 14, 18, 22, 26 and 38 hours. The mechanical shock treatment was accomplished by dropping the logs onto the floor three consecutive times, in a vertical position. Water temperature and immersion time affected L. edodes yield, which increased two to four times when the logs were immersed in cool water for the shortest times (6 and 10 hours). The mechanical shock treatment did not increase the sporophore yield.

O objetivo deste trabalho foi avaliar o efeito do choque térmico e mecânico na produtividade de Lentinula edodes em 140 toras de Eucalyptus saligna, completamente colonizadas pelo fungo, em diferentes tempos de imersão em água e no primeiro fluxo de produção. As toras foram imersas em água resfriada (16°C) ou à temperatura ambiente (22°C); os períodos de imersão corresponderam a 6, 10, 14, 18, 22, 26 e 38 horas; o choque mecânico foi acompanhado por três quedas consecutivas da tora, em posição vertical, no chão. A temperatura da água e o tempo de imersão afetaram a produção de L. edodes, resultando em aumentos significativos (2 a 4 vezes) nos tratamentos em que as toras foram submetidas à água resfriada e nos tempos de imersão mais curtos (6 e 10 horas). O choque mecânico não resultou em aumento na produção de basidiomas.

Productivity, biological efficiency, and number of Agaricus blazei mushrooms grown in compost in the presence of Trichoderma sp. and Chaetomium olivacearum contaminants

This experiment was carried out to evaluate the effect of the fungi Trichoderma sp. and Chaetomium olivacearum on the productivity, biological efficiency and number of Agaricus blazei mushrooms grown in compost (mixture of crushed sugarcane, coast-cross grass trash, soybean meal, gypsum, and calcitic limestone). The experiment consisted of 3 treatments (Trichoderma sp., C. olivacearum, and a control) with 8 replications each (box containing 12kg of compost colonized by A. blazei). Later, 150g of inoculum of each contaminant fungus (Trichoderma sp. and C. olivacearum) were distributed on the surface of the compost previously colonized by A. blazei. The experiment was conducted in a greenhouse with a plastic roof, under relative humidity of about 60-90 percent and temperature between 20-34°C. Productivity was determined from the relation between fresh weight of the mushroom and fresh weight of the compost. Biological efficiency was determined from the relation between fresh weight of the mushroom and dry weight of the compost at the end of the harvesting period. Based on results obtained, the contaminant fungi did not affect the productivity, biological efficiency, and number of A. blazei mushrooms grown in compost when introduced into previously colonized composts.

Foi avaliado o efeito dos fungos contaminantes Trichoderma sp. e C. olivacearum na produtividade, eficiência biológica e número de cogumelos da produção do A. blazei em composto (mistura de cana-de-açúcar, palha de capim coast-cross, farelo de soja, gesso e calcário calcítico). O delineanamento foi inteiramente casualizado com três tratamentos (Trichoderma sp., C. olivacearum e testemunha) e oito repetições (caixa com 12 kg de composto colonizado com A. blazei). Após a colonização do composto pelo A. blazei, adicionou-se 150g de inóculo à base de triticale de cada um dos fungos contaminantes na superfície do composto seguido da camada de cobertura. O experimento foi conduzido em estufa com cobertura plástica, umidade relativa entre 60-90 por cento e temperatura de 20-34°C. A produtividade foi determinada pela relação entre a massa fresca de basidiomas e a massa úmida do composto. A eficiência biológica foi determinada pela relação entre a massa fresca de basidiomas e a massa seca do composto ao final do período de colheita. De acordo com os resultados obtidos, os fungos contaminantes C. olivacearum e Trichoderma sp. não afetaram a produtividade, eficiência biológica e número de cogumelos da produção do A. blazei em compostos previamente colonizados.