COMPARATIVE FUMIGATION TESTS UNDER PLASTIC SHEETSComparative tests were performed with different types of plastic sheets to evaluate their efficiency in the fumigation of sacked grains with phosphine, aiming at control infestations of the maize weevil Sitophilus zeamais Motschulsky. Three types of plastic covers were considered, being a new polyethilene sheet compared with two tradicional and well-known PVC sheets. Results showed a complet control of the adults of S. zeamais in all treatments. The difference observed in the control of pest immature stages was not expressive, varying between 99.12 and 99.86%. In conclusion, the new polyethilene sheet can be compared in level of efficiency with common used by PVC sheets.
KEY WORDS:
Plastic sheets; Sitophilus zeamais; fumigation; sacked cereals.