Enriquecimento da dieta do bicho-da-seda com extrato hidrossolúvel de soja

Polycarpo, Gustavo do Valle; Silva, André Aparecido Ribeiro da; Fruchi, Viviane Murer; Rigobelo, Everlon Cid; Cruz, Valquíria Cação da; Nicodemo, Daniel

doi:10.1590/s0103-84782012000900024

Cited by 9 publications

(7 citation statements)

References 8 publications

(7 reference statements)

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“…Food consumption was verified at the end of the third, fourth, and fifth stages of development of the caterpillars by placing a plastic net over the bed. The larvae passed through the plastic net to feed on fresh leaves; then the leaves that were below the net were removed and quantified [17]. At the end of the feeding period of the caterpillars, the management for cocooning was held by the placement of a wood structure over the rearing site and subsequent elevation so that the caterpillars could weave the cocoons.…”

Section: Methodology Silk Production and Treatmentsmentioning

confidence: 99%

Enhanced silk performance by enriching the silkworm diet with bordeaux mixture

et al. 2016

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This work evaluated the effect of different concentrations (5, 10, and 20%) of Bordeaux mixture (Bm) in the diet of the silkworm caterpillars in order to improve the cocoon production and structural and mechanical properties of the ensuing silk. The cocoon yield, tensile properties, and microstructure (X-ray diffraction, surface fracture, and qualitative composition) of the obtained silk fiber threads were determined. The mortality levels of caterpillars fed on mulberry leaves with Bm were up to 80% higher than the rates observed on caterpillars fed on non-treated leaves. The consumption of leaves decreased as the amount of Bm introduced to the caterpillars' diets was increased. However, the lower demand of leaves by caterpillars fed on leaves treated with 5 and 10% of Bm did not imply in obtaining lower cocoon productivity, as the raw silk rates were not different in comparison to the control group. The tensile strength and maximum strain of the fiber were greatly improved, whereas the toughness was not statistically improved by the presence of Bm in the diet. There was an increase in the concentration of Ca and Cu in the silk fiber threads treated with Bm, leading to higher crystallinity. If the cocoon producers were rewarded with an increase in cocoon quality, the application of Bm could be interesting, despite the increase in caterpillars' mortality.

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Section: Methodology Silk Production and Treatmentsmentioning

confidence: 99%

Enhanced silk performance by enriching the silkworm diet with bordeaux mixture

et al. 2016

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“…The caterpillars were fed mulberry leaves (Morus spp.) in four daily treatments (7:30 a.m., 11 a.m., 3:30 p.m. and 7:30 p.m.) in equal amounts among the groups, considering the potential food consumption by the caterpillars (POLYCARPO et al, 2012). Group 1 (G1), the control, was fed only mulberry leaves; Group 2 (G2) was fed mulberry leaves that were moistened with water; and groups 3, 4 and 5 (G3, G4 and G5), were fed mulberry leaves that were treated with aqueous bordeaux mixture at 5.0, 10.0 and 20.0%, respectively.…”

Section: Methodsmentioning

confidence: 99%

Mulberry leaves treated with bordeaux mixture protect silkworm caterpillars against fungal and viral diseases

et al. 2016

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The bordeaux mixture is used as a natural agricultural fungicide, and its application in sericulture can benefit the production of silkworm cocoons, Bombyx mori (Lepidoptera: Bombycidae). The aim of this study was to verify whether the bordeaux mixture exerts a protective effect in B. mori against fungal and viral diseases. This experiment was performed during two seasons, autumn and spring, in which 7,500 caterpillars were used at the beginning of the third instar and divided into five groups, with three repetitions of 500 individuals each. In the three groups, the caterpillars were fed leaves of Mulberry (Morus spp.) that were enriched with an aqueous bordeaux mixture solution at concentrations of 5, 10 and 20%. One group was fed exclusively mulberry leaves (control), and another was fed leaves that were moistened with water. Fungal contamination was evaluated in the integumentary surface of the insect and the mulberry leaves in the bed of creation by checking the number of colony-forming units (CFU). In the analysis of viral contamination, 20 caterpillars from each group at the beginning of the fifth instar were inoculated with 10 µl of a suspension of Bombyx mori nucleopolyhedrovirus (BmNPV). Daily, from the second to the ninth day after inoculation (dai), two caterpillars of each group were anesthetized and formalin-fixed 7% for microscopic processing and viral cytopathology analysis. A completely randomized design was used, and the CFU were compared by Tukey test with 5% significance. The results showed a decrease of 55.1% in CFU present on the mulberry leaves in the fall, when the 5% bordeaux mixture solution was used. There was no significant difference between the groups based on the bordeaux mixture in this period. During the same period, reductions of CFU of 28.5, 74.9 and 74.4% were verified in the integument of B. mori when bordeaux mixture solutions of 5, 10 and 20% were used, respectively, compared with the data that were obtained in the control group. In the spring, no difference was observed between the groups that received bordeaux mixture solution and the control. In the case of BmNPV, the 10% bordeaux mixture solution promoted greater resistance to viral infection, possibly favoring the activation of defense mechanisms of insects. Therefore, we recommend the use of a 10% bordeaux mixture solution in mulberry leaves to control fungal and viral diseases in silkworm rearing. ResumoA calda bordalesa é um produto usado como fungicida agrícola natural e sua aplicação em sericicultura pode beneficiar a produção de casulos do bicho-da-seda, Bombyx mori (Lepidoptera: Bombycidae). O objetivo deste estudo foi verificar se a calda bordalesa exerce efeito protetor em B. mori contra doenças fúngicas e virais. O experimento foi realizado em dois períodos sazonais, outono e primavera, sendo utilizadas 7.500 lagartas no início do terceiro instar, divididas em cinco grupos, com três repetições de 500 indivíduos cada. Em três grupos as lagartas foram alimentadas com folhas de amoreira (Morus spp.) enri...

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“…As the nutrition of silkworm is a key parameter to improve silk quality, many studies are being carried out, aiming to enrich the diet of the silkworm, resulting in better quality fibers [6][7][8][9]. These studies focused on artificial diet pretreatment with graphene, hormone compounds and nanoparticles diets [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of pyraclostrobin on mulberry leaves nutrients, silkworm cocoon production and silk fiber performance

et al. 2021

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The present work evaluates the effect of pyraclostrobin fungicide on the nutritional quality of mulberry leaves, silkworm cocoon production and silk fiber mechanical performance. The evaluation was performed in two consecutive years. In Spring 2015, mulberry plants were treated twice with 4 doses of pyraclostrobin (0, 100, 200, and 300 g.ha-1), 30 and 15 days before pruning of the branches. In Spring 2016, the same plants received the same doses of pyraclostrobin only 30 days before pruning of the branches. Fifth instar caterpillars were fed on treated mulberry leaves. The mineral content of mulberry leaves was determined on pruning day of the branches and 30 days before. The consumption of mulberry leaves and the mortality rate of the caterpillars fed with the treated leaves was verified, and the cocoons obtained were classified and weighed. Silk fibers were submitted to mechanical evaluation by tensile test. Morphological and physical modification were evaluated by Scanning Electron Microscope (SEM) and X-ray diffraction (XRD). In 2015, the mortality of caterpillars fed on leaves treated with pyraclostrobin was at least 26.7% higher than the control. At 2016 even with a single application the weight of the cocoons was lower. The main variation in the mineral content was observed in Mn and Fe nutrients. Mineral intake had a noticeable effect in both crystallinity and tensile strength. Results show that the use of pyraclostrobin may reduce the mechanical behavior of silk thread up to 70%, indicating that its use is not indicated for mulberry planting aiming silk feeding.

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Enriquecimento da dieta do bicho-da-seda com extrato hidrossolúvel de soja

Cited by 9 publications

References 8 publications

Enhanced silk performance by enriching the silkworm diet with bordeaux mixture

Enhanced silk performance by enriching the silkworm diet with bordeaux mixture

Mulberry leaves treated with bordeaux mixture protect silkworm caterpillars against fungal and viral diseases

Effect of pyraclostrobin on mulberry leaves nutrients, silkworm cocoon production and silk fiber performance

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