Resistance can manifest as a continuous variate that fluctuates between maximum and minimum levels. Its sensitivity to environmental factors and inoculum density is frequent. Quantitative resistance is often linked to polygenic inheritance, but it does not have the same meaning as either polygenic or minor gene resistance, as they refer to different aspects: the expression of resistance and its inheritance, respectively. Additionally, the term is not interchangeable with horizontal resistance. The term is beneficial only when there is inadequate information to describe the type of resistance more accurately.