| 21. | Not until 1947 was a rust-resistant variety developed at the Central Experimental Farm in Ottawa.
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| 22. | Unfortunately, no resistant varieties have yet been found.
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| 23. | Resistant varieties accumulate and finally treatment failure occurs.
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| 24. | Now, it is typical to replace areas that have been infected with resistant varieties of sugarcane.
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| 25. | Genetically modified crops engineered to resist herbicides are now more available than conventionally bred resistant varieties.
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| 26. | Resistant varieties are available but not commonly used.
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| 27. | Infection-resistant varieties of the plant are being developed.
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| 28. | Fill in the gaps in containers with some of the new, frost-resistant varieties now in local nurseries.
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| 29. | The alternative is to plant resistant varieties.
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| 30. | In 1993, a National Taro breeding program, with the focus on breeding Taro varieties resistant varieties, commenced.
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