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High yields in processing tomatoes depend on a great many factors, not the least of which is good weed control. Weeds compete severely with the tomato, primarily for water and light, and interfere with mechanical harvest. The arsenal of herbicides available for annual weed control in tomatoes is relatively large compared to those for other vegetable crops. However, because tomatoes are planted over a large range of soil types and weather conditions, it is difficult to make accurate general recommendations.