Torta de mamona no controle da broca-do-rizoma (Cosmopolites sordidus) em bananeira-Terra

Abstract

RESUMO -Objetivou-se avaliar o efeito da torta de mamona sobre a infestação por Cosmopolites sordidus e o desenvolvimento de mudas de bananeira cultivar Terra. Avaliaram-se diferentes dosagens da torta de mamona (0 g, 12 g, 15 g, 18 g e 24 g) aplicadas a cada dois meses, a partir do plantio em mudas de bananeira dispostas num delineamento inteiramente casualizado, com dez repetições. Avaliou-se a evolução vegetativa das mudas pela altura da planta, pelo diâmetro do pseudocaule e pelo número de folhas verdes. Efetuou-se a infestação das plantas com 25 adultos de C. sordidus em cada muda. Os danos causados foram avaliados por meio da percentagem de galerias no rizoma, número de adultos vivos e mortos, número de larvas e número de pupas. Determinou-se também o efeito dos tratamentos sobre o valor de absorbância relativo ao teor de clorofila nas folhas por meio do uso de um clorofilômetro. Observou-se baixa infestação da broca-do-rizoma nas mudas tratadas com a torta de mamona. O crescimento e a absorbância foram afetados positivamente pela aplicação da torta de mamona. Assim, a torta de mamona reduz a população de C. sordidus nos rizomas de bananeira cv. Terra, favorece o crescimento das plantas e aumenta o valor de absorbância. Termos para indexação: Musa sp., Ricinus communis, manejo orgânico. CASTOR BEAN PIE ON THE CONTROL OF BANANA WEEVIL BORER (Cosmopolites sordidus) IN BANANA 'TERRA'ABSTRACT-The aim of this study was to evaluate the effects of castor bean pie on the infestation by Cosmopolites sordidus and on the development of banana plants cv. Terra. To observe the dose-response relationship, each treatment focused on a different dosage of castor bean pie (0 g, 12 g, 15 g, 18 g, 24 g) applied every two months to the banana plants, starting from the planting date. The experimental design was completely randomized with ten replicates. Plant vegetative growth was evaluated by measuring plant height, pseudostem diameter, and counting alive (or green) leaves. The infestation of plants was undertaken by using 25 adults of C. sordidus per plant. Six months after planting, the percentage of damage caused was scored on rhizomes and the number of adults (alive and died), larvae, and pupae was registered. Absorbance related to the leaf chlorophyll content was also determined by a chorophyllometer. In plants treated with castor bean pie there was a low infestation of the banana weevil borer. Vegetative growth and absorbance were also positively affected by applying castor bean pie. Therefore, castor bean pie reduces C. sordidus population in rhizomes of bananas cv. Terra, improving vegetative growth and chlorophyll content in leaves.

Vegetative and productive performance of plantain genotypes of the Terra subgroup

“…A major factor that contributes to a lower second cycle performance is the high susceptibility of the plants to the rhizome weevil, which is a common characteristic of plantain genotypes. This shows how the lack of studies and information on these cultivars leads to management practices without adequate techniques (Lins et al, 2013). Another productive characteristic, number of hands, was also higher in cultivar Maranhão of the French plantain type, considering the average of the two productive cycles (Table 4); however, the obtained results were below those of Faria et al (2010) and Coelho et al (2013).…”

Hydrolats and extracts vegetable action on quality of stored castor bean seeds in non-controlled conditions

“…Production of oilseeds plants has been prominent on the national scene due to the growing interest in the production of oil for the biodiesel production. Among the cultivated oilseeds, the castor bean (Ricinus communis L.) has advantages for producing good quality oil to the manufacture of various industrial products, castor beans press cake is used as organic fertilizer with high C/N ratio of 11:1 (high content of nitrogen) and efficient control of some pests (Martins et al, 2011;Lins et al, 2013).…”

Formulação De Barras Mistas De Frutas Amazônicas

“…Destas destacam-se o cupuaçu (Theobroma grandiflorum Schum) e a castanha-do-brasil (Bertholletia excelsa, H. B. K.). Ressalta-se ainda que na região Norte e Nordeste do Brasil tem-se o cultivo e o consumo da banana do tipo Terra (LINS et al, 2013).…”