Alternative treatments in bean seeds for repelling Acanthoscelides obtectus (SAY)

Marcelo Ramos de Oliveira, Lisandro Tomas da Silva Bonome, Henrique von Hertwig Bittencourt, Edenilson Zarowni, Luan da Silva Lefchak

Abstract


The objectives of this study were to evaluate treatments with alternative products for repelling bean weevils, and to assess
their influence on the physiological quality of Phaseolus vulgaris seeds. The experiment was carried out in a completely randomized
design, with four replications, in a two-factorial scheme (10x4). It comprised 10 treatments: Piper nigrum, diatomaceous earth and
kaolin (4 g/kg of seed); Cinnamomum zeylanicum, Citrus sinensis and Eucalyptus sp. (1% of the seed weight); Azadirachta indica oil
(3 mL/kg of seed); Gastoxin (6 g/t of seed); PET container; control; and the storage times of 0, 25, 50, and 75 days. The variables seed
moisture content, germination, emergence speed, mean emergence time, weight of one thousand seeds, seed infestation, and repellency
were evaluated. The treatments with kaolin and A. indica had a repellent effect at first, but they lost effectiveness by the end of the
storage period. The products based on C. zeylanicum and Eucalyptus sp. did not have such impact during early periods of storage, albeit
repellency grew with time. On the other hand, C. sinensis and diatom-based products were repellents, both at the beginning and at the
end of storage. The treatments with diatomaceous earth, kaolin, P. nigrum, C. zeylanicum, Eucalyptus sp., A. indica, and PET container
all proved to be effective in reducing bean weevil infestation, without negatively impacting the physiological quality of the seeds.


Keywords


seed storage, bean weevil, Phaseolus vulgaris, alternative product, seed quality.

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