Weed control evaluations were available from 4 to 8 Experimental Phase studies and from 9 to 16 Pilot Phase studies (Table 4) but were not subject to meta-analysis. Evaluations of weed control efficacy by glyphosate applications in the three GM hybrids and by mechanical treatment in the conventional isohybrid were conducted at 11, 20, and 30 days after treatment. Weed control in the GM hybrids with up to two over-the-top complete applications of Faena Fuerte® with Transorb® was consistently higher than for the alternative weed control treatment in the isohybrid control. On average, weed control in the GM hybrids was 3.1 % higher than in the isohybrid conventional control in the Experimental Phase studies, and 13.1 % higher than the control in the Pilot Phase studies (Table 4).Table 4Weed control means in Experimental and Pilot Phase studies of MON-89Ø34-3 × MON-88Ø17-3, MON-89Ø34-3 × MON-ØØ6Ø3-6, and MON-ØØ6Ø3-6 GM hybrids and the conventional isohybrid control in Mexico 2010–2013a HybridAverage no. of days after treatmentExperimentalPilotNo. of studies% weed controlNo. of studies% weed controlTestControlTestControlMON-89Ø34-3 × MON-88Ø17-31190.983.389.865.420895.995.21692.877.93098.691.195.185.5Average95.189.992.576.3MON-89Ø34-3 × MON-ØØ6Ø3-61188.484.889.882.720897.599.7995.686.43099.3100.096.789.7Average95.094.994.086.3MON-ØØ6Ø3-61188.283.391.272.820496.895.21594.977.93095.691.195.585.4Average93.589.993.978.7 aWeed control data were not subject to meta-analysis