Métodos de amostragem para a detecção e estimativa das populações de insectos associados ao arroz pós-colheita

The present work has the objective to implement the components of Integrated Pest Management into the current system of the paddy rice post-harvest. The assays had been initiated in bulk paddy stored in warehouse and silos after the harvest. Some methods of sampling were evaluated to get more quantitative estimates of insect pest populations in the cereal: examination of grain samples and investigating pitfall and StorGard WB Probe II traps without attraction baits. Also, Storgard Dome traps were used, with atractants (food and pheromones) for ascertaining residual infestations under drying silos. The results show that traps are much more efficient than the examination of grain samples for determining infestation. The StorGard WB Probe II traps captured significantly more insects and more species than did pitfall traps. StorGard WB Probe II traps have the advantage to intercept insects to some depths, are easy to handle, are durable, are continuously acting and can detect the insect populations at low densities. The Storgard Dome traps captured several insect species and was useful in the detection of sources of infestations. The relative density and the spatial pattern were examined for Cryptophagus saginatus, Sitophilus zeamais, S. oryzae, Coninomus constrictus, Carpophilus dimediatus, Ptinus raptor, Oryzaephilus surinamensis, Tribolium castaneum, Gnathocerus cornutus and Sitotroga cerealella