A Crystal form B 1.5 - dimethyl - 3 - 6 - tioxo (2,2,7 - trifluoro - 3 - oxo - 4 - (2 - prop - inil) - 3,4-dihydro - 2H - benzo [b] [1,4] oxazin - 6 - yl) - 1,3,5 - triazinan - 2.4 - dione.It also relates to a process for the production of this Crystalline form and for Plant Protection formulations containing the Crystal form of 1.5 - dimethyl - 3 - 6 - tioxo (2,2,7 - trifluoro - 3 - oxo - 4 - (2 - prop - inil) - 3,4-dihydro - 2H - benzo [b] [oxazin 1.4] - 6 - yl) - 1,3,5 - triazinan - 2.4 - dione.Claim 1: a Crystal form B 1.5 - dimethyl - 3 - 6 - tioxo (2,2,7 - trifluoro - 3 - oxo - 4 - (2 - prop - inil) - 3,4-dihydro - 2H - benzo [b] [1,4] oxazin - 6 - yl) - 1,3,5 - triazinan - 2.4 - dione wherein, it has a diagram of x-ray Powder diffraction lines and a cu Ka Radiation exhibits at least 3 The following Reflections, referred to as values: 9.0 + 2Q 0,2 u00ba, 10.9 (0,2 u00ba 11.5 (0,2 u00ba, 12.9 (0,2 u00ba,13.5 (0,2 u00ba, 14.9 [0,2 u00ba, 16.4 (0,2 u00ba, 16.5 (0,2 u00ba 17.5 (0,2 u00ba and 20.3 (0,2 u00ba.Claim 7: a Fitoprotector Agent, wherein the Crystal form B contains 1.5 - dimethyl - 3 - 6 - tioxo (2,2,7 - trifluoro - 3 - oxo - 4 - (2 - prop - inil) - 3,4-dihydro - 2H - benzo [b] [1,4] oxazin - il - 6) triazinan 1,3,5 - 2.4 - dione According to claim 1, and one or more Additives habitual pa The Development of Plant Protection agents.Una forma cristalina B de 1,5-dimetil-6-tioxo-3-(2,2,7-trifluoro-3-oxo-4-(prop-2-inil)-3,4-dihidro-2H-benzo[b][1,4]oxazin-6-il)-1,3,5-triazinan-2,4-diona. También se refiere a un proceso para la producción de esta forma cristalina y formulaciones para la fitoprotección que contienen la forma cristalina de 1,5-dimetil-6-tioxo-3-(2,2,7-trifluoro-3-oxo-4-(prop-2-inil)-3,4-dihidro-2H-benzo[b][1,4]oxazin-6-il)-1,3,5-triazinan-2,4-diona. Reivindicación 1: Una forma cristalina B de 1,5-dimetil-6-tioxo-3-(2,2,7-trifluoro-3-oxo-4-(prop-2-inil)-3,4-dihidro-2H-benzo[b][1,4]oxazin-6-il)-1,3,5-triazinan-2,4-diona, caracterizada porque tiene
