Abstract
Knowledge of the dispersion of adults and nymphs of Edessa meditabunda in soybean model is needed to determine the control actions and thus enable proper use of strategies to avoid losses in production. This research aimed to conduct probabilistic analysis of the spatial distribution patterns of adults and nymphs of E. meditabunda in two regions in soybean Bt and non-Bt. For the evaluations, the method of cloth-to- beat was used, where one sample per plot was collected randomly from each experimental area. Evaluations were performed at 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91 and 98 days after emergence. For data analysis, the rates of dispersion (variance/average Morisita index and exponent k Negative Binomial Distribution) and theoretical frequency distributions (Poisson, Binomial and Negative Binomial Positive) at 5% probability were calculated. The peak population of adults and nymphs of E. meditabunda was observed in the reproductive stage of soybean Bt and non-Bt in Dourados and Douradina. From the results obtained, it can be concluded that the Bt technology had the spatial arrangement of adults and nymphs of E. meditabunda, and is set in probabilistic arrangements with negative binomial distribution (aggregate) in the two regions surveyed. In non-Bt soybeans for adults and nymphs of E. meditabunda, spatial arrangements had set in probabilistic arrangements of positive and negative binomial distribution (uniform), as the days after emergence, for the region of Dourados and Douradina. Key words: Glycine max L., damage, horizontal dispersion, spatial arrangement.
Highlights
Soybean [Glycine max (L.) Merrill] worldwide, plays the primary role of oilseed production and for consumption (Leal-Costa et al, 2008; Silva et al, 2012; Vianna et al, 2013)
The peak population of adults and nymphs of E. meditabunda was observed in the reproductive stage of soybean Bacillus thuringiensis (Bt) and non-Bt in Dourados and Douradina
It can be concluded that the Bt technology had the spatial arrangement of adults and nymphs of E. meditabunda, and is set in probabilistic arrangements with negative binomial distribution in the two regions surveyed
Summary
Soybean [Glycine max (L.) Merrill] worldwide, plays the primary role of oilseed production and for consumption (Leal-Costa et al, 2008; Silva et al, 2012; Vianna et al, 2013). This fact is explained by importance of both. Products for animal consumption through soybean meal, and for human consumption by the oil (Silva et al, 2010). Brazil has great relevance for agribusiness, verified by the increase of cultivated areas, mainly by increasing productivity through the use of new technologies (Zadinello et al, 2012; Fonseca et al, 2013a)
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