Distribuição espacial e preferência alimentar de Tibraca limbativentris stal (Hemiptera: Pentatomidae) na cultura do arroz e em vegetação nativa e espontânea na região norte maranhense

Abstract

The rice stem bug (Tibraca limbativentris (Stal, 1860)) is one of the most importante pest of rice culture. Cause damage in vegetative and reproductive phases. When the rice is harvestm, the adults overwinter in crop rest or secondary host plants located nearby paddy field, just waiting for the next crop. The objective of this research was to study the spatial distribution and feeding preference of T. limbativentris in rice and native and spontaneous vegetation in northern Maranhão State. Experiments were conducted at the Campus and at the Laboratory of Entomology State of University of Maranhão. In field, as study area was analyzed family owned producer in municipality of Matões do Norte in the years of 2012 and 2013. Babaçu palm were surveys and quantified as the number of individuals. He collected a total of 1418 adults living rice stem bug, 13 killed and 10 postures. We can see the importance of babaçu palm tree such a host of T. limbativentris in Maranhão State. Under laboratory conditions, bed bug nymphs and adults were used in the tests of attractiveness in test and no choice of food. All hosts presented lesions bites. In no-choice test, Br Irga was most preferred by nymphs after 24 hours of exposure and by adults after 12 hours of exposure in freechoice test. There was no significant difference in the interaction hours of exposure within each host in both tests in the developmental stages of the bug