Population density of Tibraca limbativentris on flood irrigated rice and alternative host plants

Abstract

The objective of this work were to evaluate the population dynamics of the rice stem bug (Tibraca limbativentris) around and in flood irrigated rice cultivation area, to quantify the insect population flow between crops and host plants, and to determine the effect of the species, the diameter of the plant, and the distance of the host plant from the border on the rice stem bug population. The work was conducted in the 2012/2013 harvest and in the off-season, with sampling of rice, Andropogom bicornis, and Andropogon lateralis plants in six cultivated areas, in order to count the number of insects. The population density of the rice stem bug in irrigated rice and alternative host plants presents spatial and temporal dependence. In the cultivated areas, the population density of the rice stem bug increases according to the evolution of the rice phenological stages, with the highest densities concentrated in regions close to the crop borders. The diameter and species of the host plant affect the rice stem bug population. Andropogon bicornis plants have higher population densities than A. lateralis, and plants with larger diameters show higher population densities of the rice stem bug. In the off-season, the greatest population of the rice stem bug on host plants is concentrated up to 45 m from the crop border, but it can disperse until 150 m.

Spatial distribution and sample size to estimate Lycosa erythrognatha (Araneae: Lycosidae) population density overwintering

“…Several studies involving the occurrence of arthropods in transects between cropped areas and native vegetation sites have been carried out, which corroborates the importance of these areas within the agroecosystem for maintaining pest insect populations overwintering (Cividanes, 2002;Bortolotto et al, 2016;Engel et al, 2018;Pasini et al, 2018). Thus, it is necessary to understand the distribution patterns and build sample plans for their potential biocontrol agents in these areas.…”

“…Plants of A. bicornis, E. retusa and S. angustifolium are randomly found in different environments with different sizes. They are considered part of the vegetation of the Brazilian southern fields, interfering in the occurrence and distribution of the individuals existing in that environment (Boldrini, 2009;Klein et al, 2013;Pasini et al, 2018;Engel et al, 2018). Among the species that seek shelter in these plants during the winter, there are important predators that help control pests.…”

Relationship Between Stink Bug Populations in Winter Shelters and Atmospheric Variables in Soybean Growing Areas in Southern Brazil

“…In short, the results obtained in this experiment demonstrate how the climatic variation during the off-season of the soybean crop rapidly translated into changes in abundances and co-occurrence of stink bugs in refuges. The searching pattern for economically important stink bugs by alternative plants during the off-season in the Neotropical region has been widely corroborated (Smaniotto & Panizzi 2015;Pasini et al 2018, Engel et al 2019. Nevertheless, few studies are dedicated to determining which variables influence their abundance within this period (Santos et al 2006, Klein et al 2013, Fuentes-Rodríguez et al 2020.…”

“…such as crops of forage turnip, canola, corn, and wheat, besides weeds such as buva (Smaniotto & Panizzi 2015, Bianchi et al 2019. Afterwards, there is a period of quiescence in June, when there is a drop in the photoperiod and air temperature (Pasini et al 2018). After the rise in air temperature and photoperiod, stink bugs tend to leave these refuges, finding nutrients in corn and other associated plants, resulting in the multiplication of these species, which start to colonize the soybean crop again (Panizzi et al 2012).…”

Interpolators in predicting the estimated population density of Oebalus spp.

“…Interpolation procedures are important tools for monitoring insect pests and other harmful organisms. From the understanding of the behavior of the target pest, it is possible to define management zones in order to optimize the use of pesticides besides helping in the prediction of the emergence of harmful species to cultivated plants (Sciarreta & Trematerra, 2014;Pasini et al, 2018).…”