Robson Antonio Botta

Nível de infestação de moscas-das-frutas em faixa de fronteira, no Rio Grande do Sul

Fruit flies are considered the major pests of fruit worldwide. Tefritids and lonchaeids are major pests in this group of insects. However, little information exists regarding the potential for harm of lonchaeids. The aim of this study was to identify the infestation levels of fruit flies in the boundary zone of Rio Grande do Sul with Argentina and Uruguay. The study was conducted in 2011 and 2012 in Itaqui, Quarai, Santana do Livramento and Uruguaiana, RS. Fruits were collected from19 exotic and native plant species, and the infestation levels in pupae/kg of fruit and pupae/fruit were calculated. The highest rate of Ceratitis capitata infestation occurred in nectarine, with 72.01 pupae/kg and 2.51 pupae/fruit. Anastrepha fraterculus showed high levels in cherry, corresponding to 57.57 pupae/kg and 0.23 pupae/fruit. Lonchaeids were represented by Neosilba and Lonchaea, infesting papaya and star fruits, respectively. In the studied municipalities of Rio Grande do Sul, the following species of fruit flies occurred: C. capitata, A. fraterculus, Neosilba zadolicha and Lonchaea sp.

Mortalidade de percevejo-do-colmo do arroz no preparo do solo para cultivo mínimo

The objective of this work was to verify the influence of the management of irrigated rice stubble, during soil tillage, on the reduction of pre-hibernating populations of the rice stem bug (Tibraca limbativentris). The treatments consisted of the following rice stubble managements: one harrow pass; two harrow passes; two harrow passes, with a leveling pass; and a control. In each sampling unit, the number of nymphs and adults of the rice stem bug was determined. In the soil preparation, at least two harrow passes are necessary to reduce the pre-hibernating population of the rice stem bug.

Desempenho da mistura de aveia preta e azevém em função da adubação orgânica e mineral

Performance of the mixture of black oat and ryegrass as a function of organic and mineral fertilization Maximizing the efficiency of existing production systems and reducing the intake of external inputs and production costs is the principle of modern farming and livestock production. In this context, the aim of this study was to evaluate the influence of organic and mineral fertilization on dry mass (DM) development and production of the consortium of black oat (Avena strigosa Schreb.) and ryegrass (Lolium multiflorum Lam.). The experiment was arranged in a randomized block design, with four replications, with the following treatments: without fertilization, mineral fertilization only , organic and mineral fertilization (50% mineral and 50% organic) and organic fertilization only. The experiment was