اثر دوازده اسانس گیاهی روی Bipolaris australiensis عامل خشکیدگی درختان سرو لاوسن در شمال ایران

Ornamental plants are the most important export and profitable crops in the agricultural sector, but they are attacked by a large number of harmless agents. The fungus Bipolaris australiensis is known as the cause of drying of Lawson cedar trees in northern Iran. The study was conducted to assess the inhibitory effect of the essence of the plants of zinc, thyme, lavender, cacti, lemon grass, fennel, eucalyptus, peppermint, the case, gulper, rosemary and barricade on the growth of the fungus in laboratory conditions. The essences were evaluated with concentrations of 2000, 1000, 100, 10 and 1 ppm by disk and mixing with the culture medium, and their growth inhibitory strength was determined by measuring the growth diameter of the pergola and the inhibitory Halo.The results showed that the higher the concentration of essences, the higher their effectiveness. The essence of the thyme was most effective in the disk release Test at a concentration of 2000 ppm with an average inhibition of 34/10 mm. In the test of inhibition of the growth of Pergola in the method of mixing with the cultivation environment at a concentration of 2000 ppm, respectively, zinc (16/34%), thyme (73/47%), cocoa (38/39%) and lemon grass(48/33%) on B. australiensis had the greatest impact.The effect of different essences on the germination percentage of Sporgarch B. australiensis was the highest inhibitor of lemon grass and zinc essence at a concentration of 2,000 ppm, which prevented the germination of spores of this fungus by 67/26%.Findings of the experimental effect of fungicides and static fungi of plant essences and chemical fungicides on B. australiensis showed that the essential oils of zinc, lemon grass, thyme have fungicidal properties at a concentration of 2,000 ppm and the cocoa essence at a concentration of 2,000 ppm have standing mushroom properties, and the rural fungicide and copper oxychloride have standing mushroom properties on this patient, respectively. The test, which was conducted to compare or witness the effect of fungicides with essential oils, examined the effect of 5 fungicides, copper oxychloride, mancosb and roral TS, methyl thiophanate, berdophyx, with a concentration of 2000ppm of the active ingredient. In the study of the inhibition of chemical fungicides studied by mixing with the cultivation environment based on the statistical results of all fungicides in reducing the growth of the B fungus.australiensis were effective.The most affected were two copper oxychloride fungicides and roral TS with 100% inhibition.All fungicides are fully formed from the germination of the fungus B. australiensis prevented so because plant essences, unlike chemical toxins, do not endanger humans or the environment, they can be used to manage the disease by identifying and formulating the active ingredients of the essences of avian, grass, zinc and coconut.