Associação do óleo essencial de Eugenia uniflora e Bacillus thuringiensis sobre Alphitobius diaperinus (Panzer) (Coleop.: Tenebrionidae)
The objective of this study was to evaluate the effect of essential oil of Eugenia uniflora and Bacillus thuringiensis alone and the association these on larvae and adult Alphitobius diaperinus in laboratory conditions. To this, they were evaluated essential oil different concentrations of E. uniflo...
| Autor principal: | Pegorini, Carla Samanta |
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| Formato: | Dissertação |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2017
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/2248 |
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| Resumo: |
The objective of this study was to evaluate the effect of essential oil of Eugenia uniflora and Bacillus thuringiensis alone and the association these on larvae and adult Alphitobius diaperinus in laboratory conditions. To this, they were evaluated essential oil different concentrations of E. uniflora (0%, 0,25%, 0,50%, 0,75%, 1,0%, 1,25% and 1,5%) on larvae and adult A. diaperinus, in order to select the concentration that caused around 50% mortality in insects, for use in association experiment. To occur emulsification of oil was mixed 10 uL of tense active Tween® 80 (0,01%) in water. It was performed to evaluate the effect of insecticide different strains (BR 137, BR 140 and BR 146) of B. thuringiensis, concentration 3×108 CFU/mL, on larvae and adults of A. diaperinus to select the strain that causes most mortality percentage to be used in association experiment. In both experiments, 10 mL of each concentration (oil or bacteria)was added and mixed to 38 g of commercial feed for broilers, previously sterilized, for adults and 20 g of feed, for larvae. After preparation of the mixture, this was divided into eight equal parts and distributed in Petri dishes (150 mm x 20 mm) for adults and acrylic plates with 12 individual wells to larvae.Each plate was considered a repetition and received 12 larvae and 12 adults, totaling 96 insects per treatment. As control was mixed with feed sterilized distilled water. The plates were placed in a climatic chamber at 27 ± 2 ° C, RH 70 ± 10% and photoperiod of 14 hours. The evaluation was conducted every day for nine days by quantifying the number of dead individuals. For the association experiment were used the three strains of B. thuringiensis (BR 137, BR 140 and BR 146), at the concentration 3×108 CFU/mL and the essential oil of E. uniflora at a concentration of 1% for causing 50 % mortality of the larvae. Experimental design and procedures for assembly, storage and evaluation were the same as described for the previous experiments. The essential oil of E. uniflora at a concentration of 0,75% caused higher mortality in larvae of A. diaperinus (70,83%), however, did not differ from concentration of 1% (50%). For adults, the essential oil showed no insecticidal effect on measured concentrations. The strains of B. thuringiensis, BR 137, BR 140 and BR 146 presented insecticidal effect with mortalities of 38,54%, 48,95% and 51,04% respectively for larvae of A. diaperinus. For adults, the strains showed no insecticidal effect. The association of lines BR 137, BR 140 and BR 146 with the essential oil of E. uniflora 1% mortalities were 80,55%, 62,50% and 81,94%, respectively. The essential oil of E. uniflora caused only insecticidal effect on larvae of A. diaperinus. The three strains of B. thuringiensis were pathogenic only for larvae of A. diaperinus. The association of strains of B. thuringiensis and E. uniflora essential oil, agents do not interfere negatively on one another, suggesting the possible use of such an association. The results obtained were observed significantly in the larval stage, which means that more studies are developed in order to select more virulent strains and concentrations higher insecticidal effect to adult insects. |
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