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The beneficial effect of chitin-based treatments to antagonistic bacteria is not restricted to B. subtilis, with both chitin and chitosan improving the control of Fusarium wilt in both tomato [66] and cucumber [67] when applied to the soil with a range of different species of chitinolytic microbes.
There are many kinds of bacteria, some which cause deadly diseases and some which are helpful to man. Those which are harmful cause diseases in man, animals, and plants. They can cause food to spoil, even poisoning people who eat them. But there are a great many bacteria that man and nature use in helpful ways. For example, bacteria play an important role in making buttermilk, sauerkraut, cheese, and vinegar by causing a chemical change called fermentation. Bacteria also attack dead plants and animals, and break them down into nourishment for the soil. Bacteria are even used to purify water in sewer treatment plants!