Flutuação populacional da sogata, Tagosodes orizicolus (Muir) (Hemiptera: Dephacidae), em agroecossistema de arroz irrigado no estado de Santa Catarina, Brasil
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
J. Selva Andina Biosph.
Abstract
Resumo A flutuação populacional da sogata, Tagosodes orizicolus (Muir) (Hemiptera: Delphacidae), em agroecossistema de arroz irrigado em Santa Catarina não é conhecida. Isto dificulta o planejamento das medidas de manejo integrado de pragas a serem implantadas nas lavouras. Desta forma, objetivou-se monitorar a ndividuos da sogata, visando conhecer a flutuação populacional e determinar as épocas de maior ocorrência da cigarrinha nas lavouras. Coletas com rede de ndividuo foram efetuadas semanalmente nos ambientes: lavoura de arroz, área em pousio e pastagem. Cada amostra foi composta por 30 golpes pendulares de rede, retiradas em cinco pontos de cada ambiente. Concomitantemente, armadilhas luminosas foram instaladas em áreas de cultivo de arroz irrigado na Estação Experimental da Epagri em Itajaí, SC. A partir de setembro de 2020 a março de 2024, as armadilhas foram ligadas das 16 às 9 horas, uma vez por semana, exceto de abril a agosto de cada ano, quando permaneceram desligadas. A flutuação populacional de T. orizicolus em lavoura de arroz irrigado caracterizou-se pelo baixo número de ndividuos entre outubro e dezembro e o posterior crescimento contínuo do número de ndividuos a partir de janeiro. Na entressafra, a população de sogata mantém-se nas áreas com rebrotes de arroz. Em Itajaí, Santa Catarina, as maiores populações ocorreram no mês de março.
The South American sogata, Tagosodes orizicolus (Muir) (Hemiptera: Delphacidae), population dynamics in irrigated rice ecosystem in Santa Catarina State, Brazil, is still unknown. This makes difficult the overall planning of integrated pest management measures to be implemented in farms. The aim of this study was monitoring the sogata incidence to know its population dynamics and its periods of greatest occurrence in rice fields. Weekly sweep net samplings were carried out in the following environments: rice field, fallow land and pasture. Each sample consisted of 30 pendulum strokes of the net, taken at five points in each environment. Concomitantly, light traps were set in irrigated rice fields at Epagri Experimental Station, in Itajaí, SC. From September 2020 to March 2024 the light traps were turned on, from 4pm to 9am once a week, except from April to August of each year when they remained turned off. The population dynamics of T. orizicolus in irrigated rice fields was characterized by a low number of individuals between October and December and a subsequent continuous increase of individual's number from January onwards. In the off-season, the sogata population remains in areas with rice regrowth. In Itajaí, Santa Catarina, the largest populations in irrigated rice fields occurred in March.
The South American sogata, Tagosodes orizicolus (Muir) (Hemiptera: Delphacidae), population dynamics in irrigated rice ecosystem in Santa Catarina State, Brazil, is still unknown. This makes difficult the overall planning of integrated pest management measures to be implemented in farms. The aim of this study was monitoring the sogata incidence to know its population dynamics and its periods of greatest occurrence in rice fields. Weekly sweep net samplings were carried out in the following environments: rice field, fallow land and pasture. Each sample consisted of 30 pendulum strokes of the net, taken at five points in each environment. Concomitantly, light traps were set in irrigated rice fields at Epagri Experimental Station, in Itajaí, SC. From September 2020 to March 2024 the light traps were turned on, from 4pm to 9am once a week, except from April to August of each year when they remained turned off. The population dynamics of T. orizicolus in irrigated rice fields was characterized by a low number of individuals between October and December and a subsequent continuous increase of individual's number from January onwards. In the off-season, the sogata population remains in areas with rice regrowth. In Itajaí, Santa Catarina, the largest populations in irrigated rice fields occurred in March.
Description
Vol. 12, No. 2