The objective of this work was to compare the effects of infestation with adults of rice stink bug, Oebalus poecilus (Dallas) Stal, on panicles of 39 genotypes of irrigated rice. In the field, newly emerged panicles were isolated in cages and infested with two insects in the beginning of the milky stage. Non-infested panicles comprised the controls. After harvest, samples of 50 spikelets from each infestation level were seeded in screen house, and the emergence was determined 16 days after planting. Stains in the grain were evaluated in samples of 50 spikelets. The stink bug produced significant alterations, reducing weight and number of spikelets per panicle, and percentage of seedlings, and increasing the percentage of empty spikelets and spikelets with stained grain. Combined percentage of weight loss with no viable seeds was 44%, and combined percentage of weight loss with stained spikelets was 81.4%. The highest percentage of seedlings emerged from stained spikelets was observed in genotypes of median season. The short season genotypes CNAi 8859, CNAi 8879, CNAi 8885 and CNAi 8886, and the median season genotypes CNAi 9089, CNAi 9097, CNAi 9150 CNAi 9687, CNAi 9730, CNAi 9747 and CNAi 9778 are the most tolerant to rice stink bug.
Oryza sativa; Oebalus poecilus; Hemiptera; Pentatomidae; early genotypes; late genotypes
