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Diseases of onions in Canada

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Title: Diseases of onions in Canada
Author: Crête, Rene; Tartier, Leon; Devaux, Alain
Abstract: Onions are an important vegetable crop in Canada. Some 3700 ha are planted annually, and average yields are about 25 t / ha. The bulk of the crop goes to the fresh market, and the remainder is used for processing. Canada is not self-sufficient in its onion supply, imports, mainly from the United States, are four or five times as high as exports. The onion is a cool-season vegetable that is well adapted to areas with long, cool growing seasons. The seed germinates at temperatures of 8EC or more. Cold, damp soil delays germination and growth, providing favorable conditions for seed rots and seedling diseases. Onions need deep, loose, fertile soils with good water-holding capacity for plant development. Well decomposed, adequately drained organic soils are particularly suitable for them. In Canada approximately 80-90% of the onion crop is grown on organic soils. Ontario and Quebec lead the country in production. Onion leaves develop quickly when the days are short and cool at the beginning of the growing season. The bulb forms at day lengths of 12-16 hours, depending on the cultivar. The yield therefore depends on the number of leaves present at the time of bulb formation and the thickness of the leaves at the base. An abundant, healthy crop is largely a matter of effective disease control. To prevent or control diseases, it is important to be able to identify them as soon as the first symptoms appear. This publication is therefore intended to provide descriptions of the main onion diseases in Canada and to recommend preventive measures.
Date: 1981
Rights: In Copyright - Non-Commercial Use Permitted
Rights Holder: Minister of Supply and Services Canada

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