Variação populacional de Tibraca limbativentris em função de elementos meteorológicos e do manejo pós-colheita

Abstract

The aim of this work was to study the population ecology of stem bug in rice, the factors that affect the population dynamics and the implications for pest management. The study was conducted between September 2010 and September 2012 in Plateau Campaign of Rio Grande do Sul, a municipality of Itaqui, to 47 meters. In the first crop year 2010/11 monitoring of the population of rice stem bug was conducted on a segment of about eight hectares, which were conducted 814 sample points. In the following crop year 2011/12, was monitored area of six hectares, with 440 sampling points. The stink bug population survey was conducted by sampling fortnightly in georeferenced points, equidistant set 10 meters using GPS handheld. The points covered the interior area and crop plants adjacent to, or in hibernation site preferential. At each sampling point was thrown a metal structure, of 0.25 m², and plants inserted examined to count bedbug nymphs and adults of-the-stalk. By analyzing the results of meteorological factors that most affect the insect population variation are temperature and photoperiod. Determinants of a hibernation period of approximately ten months, from February to November with a main peak of adults in January and early exit from the hibernation site in late August and may last until November. The range of population stabilization within the hibernation site occurs in the monthly average temperature below 14.8 ° C and below 11.2 hours photoperiod. From the results of postharvest handling can be concluded that the realization of managing stubble shortly after harvest of grain eliminates the individuals remaining within the area and reduces the population pre-hibernating stink bug-instem.