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Simazine and Atrazine
These are examples of widely used 5-triazine herbicides. The triazines are 6-member rings containing 3 nitrogens (tri = 3 and azine = a nitrogen containing ring). The triazines are applied to soil primarily for their post­emergence action through inhibition of photosynthesis. The microor­ganisms capable of degrading the two triazines belong to the genera Aspergillus, Rhizopus, Fusarium, Penicillium and Trichoderma.