Avaliação de fungicidas, óleos essenciais e agentes biológicos no controle de Amphobotrys ricini em mamoneira (Ricinus communis L.)

Abstract

A.; Basseto, M.A.; Rosa, D.D.; Toppa, E.V.B.; Furtado, E.L.; Zanotto, M.D..Evaluation of fungicides, essential oils and biological agents on Amphobotrys ricini control in castor bean (Ricinus communis L.). ABSTRACTC. zeylanicum at all five tested concentrations. For both oils, the average diameter of colonies was 0.7 cm against 4.79 cm for the control treatment. For the fungicides, at all four tested levels, the most efficient active ingredients were methyl tiophanate, carbendazim, tebuconazole and iprodione. The ED 50 of these fungicides was <1uL/L, yielding 100% mycelial growth inhibition at all concentrations. As to the inhibition of A. ricini conidium germination, the fungicides tebuconazole and chlorotanolyl were the best at all tested concentrations, and the average of germinated conidia with these fungicides was 0.0 and 0.15%, respectively, against 100% for the control treatment. In the field, treatment with the fungicide iprodione was the best for the disease control when compared to biological and alternative treatments. Under field conditions, the average disease severity for the treatment with iprodione was 15.76% against 95.81% for the inoculated control.

Essential oils of Tahiti lemon and cinnamon bark in control of storage fungi and the physiological and sanitary quality of beans

“…and Aspergillus sp. were isolated from common bean seeds variety Tuiuiú using the seed health test, incubation on paper substrate by the blotter test method (BRASIL, 2009). A single conidium was collected and cultivated in potato-dextrose-agar (PDA) and kept at 25 ± 2°C, being used with 10 days of growth.…”

“…Four replications of 50 seeds for each treatment were used, arranged in rolls of paper moistened with distilled water in a proportion of 2.5 times the weight of the dry paper, which were kept in a germinator Mangelsdorf type, at a temperature of 25 o C with constant light. The evaluations were performed at 5 th and 9 th day counting the normal, abnormal, dead and dormant seedlings, and the results were expressed in percentage (BRASIL, 2009).…”

Selectivity of Chlorimuron-Ethyl to Castorbean Crops

“…The castorbean (Ricinus communis L.) is a tropical species, whose oil, extracted from its seeds, is one of the most versatile, with innumerous industrial applications (Chagas et al, 2014). However, the world consumption has been limited by the low availability in the market (Severino et al, 2012), which demonstrates great economic potential to expand the cultivation of this oleaginous plant (Campbell et al, 2014).…”

Fungitoxicity of Essential Oils on Plasmopara Viticola,causal Agent of Grapevine Downy Mildew

“…In the search for new alternatives for the control of plant diseases, secondary plant metabolism compounds present in essential oils with antifungal potential may be a viable option in the management of plant diseases in pre-and postharvest (CHAGAS et al, 2014;MAIA et al, 2014). In the worldwide literature, there is a significant increase in the number of studies that seek to find antifungal activity of essential oils as an alternative control of several plant pathogens, with promising results for cinnamon (RANASINGHE et al, 2002;KISHORE et al, 2007;MAQBOOL et al, 2010), eucalyptus (LORENZETTI et al, 2012), marjoram (FIALHO, 2012), melaleuca (FRASSON et al,2010), peppermint (CHAGAS et al, 2014) oregano (MALLET et al, 2014) and white thyme oils (PERINA et al, 2015).…”

“…In the worldwide literature, there is a significant increase in the number of studies that seek to find antifungal activity of essential oils as an alternative control of several plant pathogens, with promising results for cinnamon (RANASINGHE et al, 2002;KISHORE et al, 2007;MAQBOOL et al, 2010), eucalyptus (LORENZETTI et al, 2012), marjoram (FIALHO, 2012), melaleuca (FRASSON et al,2010), peppermint (CHAGAS et al, 2014) oregano (MALLET et al, 2014) and white thyme oils (PERINA et al, 2015). Aiming at to contribute to one more option to control the downy mildew of the grapevine, the objective of this study was to evaluate the antifungal effect of essential oils on the spore germination of P. viticola, a causal agent of grapevine downy mildew.…”