Spatial distribution of Bemisia tuberculata (Hemiptera: Aleyrodidae) on cassava crop in Brazil
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To determine an adequate sampling plan, according to the guidelines of Integrated Pest Management (IPM), it is important to understand the spatial distribution of the pest in question. The objective of this work was to develop a distribution model for Bemisia tuberculata adults on cassava crops. Sampling was performed in a commercial field of 2,500 m2, divided into 100 plots, where the numbers of individuals on the apical leaves were counted. No insecticides were applied during the study. Fifteen samples were taken weekly from January to April 2012. In general, the aggregation indices (variance/mean; Morisita index and k exponent) and frequency indices showed that the spatial distribution model that best represents this pest population was aggregated or contagious.
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