DANOS E NÍVEL DE DANO ECONÔMICO DO PERCEVEJO BARRIGA-VERDE NA CULTURA DO MILHO
DOI:
https://doi.org/10.18512/1980-6477/rbms.v14n3p291-299Keywords:
Dichelops melacanthus, densidade populacionalAbstract
RESUMO – O comportamento produtivo do milho na presença de diferentes níveis populacionais de insetos adultos do percevejo Dichelops melacanthus em diferentes estádios de desenvolvimento da planta foi determinado em casa de vegetação e no campo com o objetivo de estimar o seu nível de dano econômico (NDE). A massa seca da parte aérea e o rendimento de grãos foram significativamente reduzidos na presença do percevejo, independente dos estádios de desenvolvimento da planta (V1 a V3). Em campo, utilizando-se gaiolas e infestando as plantas no estádio V1 durante 10 dias consecutivos, não foram observadas diferenças no peso de 100 grãos em relação às densidades populacionais utilizadas. No entanto, houve redução significativa no rendimento de grãos com o aumento da densidade populacional do percevejo. Em função dos resultados obtidos, é possível estimar que o NDE para D. melacanthus na cultura do milho é de 0,8 percevejo/m2, densidade populacional na qual o controle da praga é justificado economicamente.
Palavras – chave: Dichelops melacanthus, estádio de desenvolvimento da planta, rendimento de grãos, densidade populacional, injúria.
DAMAGE AND ECONOMIC THRESHOLD OF THE STINK BUG ON CORN CROP
ABSTRACT - This work aimed to evaluate the effect of the population level and infestation time of D. melacanthus in corn, as well as to estimate its economic threshold level (ET). The damage experiment was carried out under greenhouse. Corn plants were infested with 4 adult bugs on five different plant stages for a period of 10 days. Shoot dry mass content was significantly reduced by the presence of the stinkbug at all stages and grain yield was affected by the stinkbug when infestations occurred in the stages V1, V2 and V3. In the economic damage threshold level experiment, corn plants at one leaf stage were submitted to different infestation levels of stink bug for a period of 10 days, inside cages in the field. The weight of 100 grains was not significantly affected by populations of the stink bug; however, grain yield was significantly reduced when the population density of the bug in cages increased. The economic threshold level of the D. melacanthus for corn was 0.8 stink bug/m2.
Key words: Dichelops melacanthus, plant stage of the development, yield, population density, injury.
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