This research aims to study the period of activity by essential oils suppresses growth of the fungus A. tubingenesis, and P. steckii, by way of activities with the vapours of essential oils using citronella essential oils (Cymbopogonnardus rendle) at a concentration of 100 microliter, which is kind of essential oils and concentrated on the most suitable to inhibit the fungus caused tubingenesis and P. A. steckii in a laboratory level. After that, bring the lever water hyacinth dry fuel both transplant infection by removing the fungal spore concentrations 1.0 x 106 per ml comes spraying all over your rod of dried water hyacinth. Then do the activity with the vapours of citronella essential oil in box, size of 16,000 cubic centimeters that consciousness phasa concentrations 100 microliter per plate trial size 70 cubic centimeter (9 cm diameter) according to a defined period of time, 0, 3, 6, 12, 24, 48, 72 and 96 hours results.The study found that citronella essential oil activity at a concentration of 100 microliter be inhibition of A. tubingenesis and P. Steckii have, and found that when the period of increased activity, performance of maturation in A. tubingenesis and P. Steckii, by which, when done check box.Citronella essential oil transactions, with lever, dry water hyacinth through the cultivation of the infection for a long period of 72 hours or longer. The fungus growth can be inhibited A. tubingenesis and P. Steckii have 100 percent when compared with the control unit by water hyacinth dry smoked shank with citronella essential oils at a concentration of 100 microliter for a long period of 72 and 96 hours, with the average of the percentage inhibition of fungal contamination is 100 percent.
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