Integrity Research Journals

ISSN: 2536-7064
Model: Open Access/Peer Reviewed
DOI: 10.31248/JBBD
Start Year: 2016

Assessment of the toxicity of Carica papaya plant powders against Sitophilus zeamais (Mots) (Coleoptera: Curculionidae) on maize seeds during storage   |   Article Number: 45D5CDC91   |   Vol.4 (5) - October 2019

Received Date: 25 September 2019   |   Accepted Date: 25 October 2019  |   Published Date: 30 October 2019

Authors:  Adenekan, M. O.* , Onasanya, R. O. and Owolade, E. O.

Keywords: mortality, storage., Eclosion, oviposition, Sitophilus zeamais

The toxicity of Carica papaya plant parts powder (leaf, stem bark, root and flower) at different dosages (0.5, 1.0, 1.5, 2.0 and 2.5 g) against Sitophilus zeamais infesting stored maize grains were assessed at the Biology Laboratory of the Federal College of Agriculture, Ibadan. Treatments were admixed with 30 g of maize grains, infested with 10 teneral adults of S. zeamais and stored in 3.0 mm petri dishes. The experiment was laid out in completely randomized design (CRD) and replicated four times each. Data were collected on adult mortality, oviposition and percentage weight loss of the grain in each of the replicate. Data collected were analyzed using analysis of variance, while sample means were separated with the aid of least significant difference (LSD) at 5%. There were significant differences in adult mortality of S. zeamais treated with different dosages of the plant parts powder. The flower powder of the plant recorded the highest mean adult mortality (10) compared to the lowest adult mortality of 0.1 obtained at the control experiment. The flower part powder also revealed the lowest mean eggs laid (oviposition) (7.1) and the lowest grain damage loss (1.4%) when compared with the values of 18.7 and 40.0 obtained for mean eggs laid and percentage weight loss obtained with stem bark and control treatments respectively. This clearly showed that the powder of the flower of C. papaya showed good potential as bio-insecticide for protecting stored maize grains.

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