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  2. Cereal growth staging scales - Wikipedia

    en.wikipedia.org/wiki/Cereal_growth_staging_scales

    Disease control is most critical in the stem extension and heading stage (Z31, Z32, Z35), in particular as soon as the flag leaf is out (Z37). The crop is also more sensitive to heat or frost at some stages than others (for example, during the meiosis stage the crop is very sensitive to low temperature).