A definição dos critérios para seleção de materiais é especialmente importante para o cultivo do pinhão-manso (Jatropha curcas L.), pois subsidia a caracterização dos ideótipos mais adequados para o plantio
Amazonian Robustas are ten new clones of high yield potential with characteristics typical of the botanical varieties conilon and robusta. With individual registration, the new cultivars were developed to be grown together with other clones, with flexibility of composition of the crops according to the preference of the producer.
Este trabalho teve como objetivo avaliar o efeito do óleo essencial de folhas de Schinus terebinthifolius sobre Acanthoscelides obtectus e Zabrotes subfasciatus. O óleo essencial foi extraído por arraste a vapor e diluído em acetona nas diluições 10-2; 10-3; 10-4, 10-5, 10-6, 10-7 e 10-8 (v/v). Adicionou-se 1,0 mL destas soluções a placas de Petri de 9,0 cm de diâmetro, contendo papel de filtro. Como controle, utilizou-se 1,0 mL de acetona. Após a evaporação da acetona, cinco insetos adultos foram colocados por placa, em 4 repetições, em delineamento inteiramente casualizado. Avaliou-se a mortalidade dos insetos após 24 e 48 horas. Obteve-se 100% de mortalidade de A. obtectus em 48 horas para as concentrações do óleo entre 10-2 e 10-7. No controle, a mortalidade atingiu 30% em 48 horas. Com relação a Z. subfasciatus, apenas as diluições de 10-2 e 10-3 provocaram 100% de mortalidade, após 24 e 48 horas, enquanto no controle obteve-se 25% de mortalidade em 48 horas. Este estudo evidencia a atividade inseticida do óleo essencial de S. terebinthifolius, o que sugere o seu potencial no controle destes insetos estudados.
The strategies to control the cattle tick, Rhipicephalus microplus are based mainly on the use of synthetic pesticides. However, the emergence, establishment, and development of resistance of ticks is rendering the main chemical groups ineffective. Finding new molecules to effectively control infestations by R. microplus is necessary to maintain the productivity of cattle herds, particularly of taurine breeds established in equatorial and tropical regions of the world. Ethanol extracts from the leaves, stems, and fruits of Piper tuberculatum were evaluated in bioassays at concentrations of 50, 25, 12.50, 6.25, 3.12 and 1.56 mg mL-1. The concentrations lethal to 50% of the individuals (LC50) of tick larvae after 24 hours of exposure were 3.62, 3.99 and 5.30 mg mL-1 for fruit, stem and leaf extracts, respectively. Against the engorged females, the highest efficacy rates were obtained at the concentration of 50 mg mL-1, corresponding to 71.57%, 68.38% and 37.03% of the fruit, leaf and stem extracts, respectively. The main effect of the ethanol extracts was on the egg hatching rate of ticks, with a reduction of 55.63% for the fruit and leaf extracts, and 20.82% for the stem extract. The results show that P. tuberculatum is a promising source of molecules for use as active ingredients in pesticide formulations for R. microplus control.
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