Extratos alcoólicos de capim-limão (Cymbopogon citratus) no controle pós-colheita de antracnose em goiaba CV. Paluma

Abstract

In the search for alternative methods using extracts and essential oils of medicinal plants in the control of postharvest diseases, it is necessary to research the use of methods allies' assessments of quality parameters of fruits. The objective of this study was to evaluate the effects of ethanol and methanol extract of lemon grass in vitro control of Colletotrichum gloeosporioides and post-harvest qualities of guava cv. Paluma. Were evaluated in the first experiment with treatments: distilled water (control), ethyl alcohol 96 ºGL (10%), Methanol PA (10%) aqueous crude extract of lemon grass (10%), ethanol extract of lemon grass (1%), methanol extract of lemon grass (1%) and Agromos® at room temperature uncontrolled. In the second experiment at 25 ºC ± 2 ºC, the fruits were stored immersed for 1 minute: Distilled water (control), ethanol and methanol extract (1%, 0.5%, 0.25%) and Agromos®. We analyzed the physical-chemical parameter, weight loss, SST, ATT, pH, ascorbic acid, reducing sugars and non reducing phytosanitary analysis: severity, incidence, and disease control and evaluation of % inhibition of growth and sporulation of Colletotrichum gloeosporioides under different concentrations of the extracts. High concentrations of the extracts with failure to control temperature, were influential in post-harvest quality of guava cv. Paluma stored for 8 days. In temperature controlled fruit maintained their physical and chemical characteristics. But were not effective in delaying the ripening of fruits. The treatments were effective in control of Colletotrichum gloeosporioides in vitro, but did not control the progression of the disease and its severity when compared in vivo.