Eucalyptus citrus, lemon eucalyptus or sweet-smelling eucalyptus, these are some of the best known names for the species.Corymbia citriodora. From it comes the essential oil capable of working as a natural "agrochemical", according to researcher Cátia Libarino, who is studying for a Masters in Forest Science at the State University of Southwest Bahia (Uesb).
Seeking to find a natural substance to fight a specific fungus that attacks the macadamia tree, she tested three species of eucalyptus, extracting your essential oils and plant extracts. Was inCorymbia citriodora who discovered the best option.
The greatest efficiency to inhibit the growth of the fungus is in the essential oil of the species. Even if, according to Cátia, even plant extracts can be good options to reduce the severity of phytopathogens, this is, the organisms that cause plant diseases. "The ease of preparation [of these extracts] using a mechanical processor and its high biodegradability in the environment makes the process/product more accessible. Fresh leaves in post-harvest cultivation areas or during cultural treatments can also be used for production, in medium and large scale, of plant extracts", explained the researcher.
replication
To the research advisor, professor Dalton Longue, even a small rural producer will be able to apply the techniques that are under development and highlight new uses of eucalyptus cultivation. "Mostly, the plantations [of eucalyptus] are only planned for the use of wood after the forest's growth cycle, despising the leaves and their products during the entire growth period. Leaf collection and oil production can be an economical alternative at various times to a forest farm", guarantees the teacher.
Another interesting point is that the essential oil of the speciesCorymbia citriodora contains citronellal, component that gives the lemon odor to citronella oil - widely used as an insect repellent.
organic farming
Plant cultivation through biological control has been propagated as a way to combat the exaggerated use of pesticides and, consequently, take care of human health and the soil. Ana Maria Primavesi, considered the mother of Brazilian agroecology, was one of the people to call attention to the need to re-establish the balance between man, nature and animals. Green fertilization and biological control of "pests" were some of the solutions she pointed out even in the years 80. An exemplary pioneering spirit that inspires many farmers to this day.
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