Insecticidal Activity of Piper Guineense (Schumach and Thonn) Seed Oil Against Callosobruchus Maculatus (F.) (Coleoptera: Chrysomelidae) in Stored Cowpea Seeds

Abstract

Post-harvest losses due to insect pest infestation in storage constitute a challenge to sustainable food security and economic losses to farmers throughout the world. Use of synthetic chemicals have been the most effective means of reducing losses in storage. Unfortunately, these toxicants have adverse effects in humans and the environment. There is renewed search for safer plant products as alternatives. In this study, we assessed the potential use of Piper guineense seed oil in the control of cowpea bruchid, Callosobruchus maculatus (F.) infestation on stored cowpea seeds. Adult mortality, oviposition rate, F1 progeny emergence, cowpea seed damage and seed germinability were the indices considered in the assessment under laboratory conditions. The setup of the experiment was completely randomized design (CRD). Statistical analysis of the data was by analysis of variance (ANOVA). Adult C. maculatus mortality was dose-dependent with higher dosages inducing 100% mortality. The number of eggs laid on the treated seeds were significantly (P<0.001) reduced. Progeny emergence and feeding damage were completely inhibited at higher dosages. The seed oil has no adverse effect on cowpea seed viability. The results indicated that P. guineense seed oil has protectant potential against insect pest damage in storage and a good alternative to synthetic insecticides in the control of insect pest of stored products.

Bioactivity of extracts from Syzygium aromaticum, Annona muricata, and Piper retrofractum against Spodoptera frugiperda J. E. Smith (Lepidoptera: Noctuidae)

“…Fruit of P. retrofractum contain piperamide alkaloid secondary metabolites, namely piperanine and piperside [7,13,34]. Piperamide in Piperaceae extract acts as neurotoxin, then inhibits the production of Cytochrome P450 enzymes, and caused knockdown effect on Lepidoptera larvae [7,30].…”

Effect of Hexane and Methanol Extracts of Piper guineense (Schum and Thonn) Seeds against the Maize Weevil (Sitophilus zeamais) in Stored Maize Grains

“…Such include spices, powders, oil and extracts of plant parts. Plant extracts have been commonly used in insect pest management due to their effectiveness against various insect life stages (Adedire 2001;Nzelu et al, 2020). Their mode of action varies, but with low to moderate dosages, the effect is always repellent or toxic (Rajapaske, 2006).…”

Insecticidal activities of volatile oils of lime fruit peels and African black pepper seeds on adult kola weevil and their chemical compositions

“…The seeds of P. guineense are rich in a good number of natural products such as lignans, amides, alkaloids, flavonoids and volatiles oils (Rodolfo et al, 2013) and can be used in treating cough, bronchitis, intestinal disease and rheumatism (Ojinnaka et al, 2016). They are also used in traditional African medicine, as a result of their various pharmacological effects such as antibacterial, insecticidal, anticonvulsant, antioxidant, antihypertensive, aphrodisiac, sedative and anti-inflammatory (Ojinnaka et al, 2016;Chukwunonso et al, 2020).…”