Repellent effect of sirinol (garlic emulsion) against Lasioderma serricorne (Coleoptera: Anobiidae) and Tribolium castaneum (Coleoptera: Tenebrionidae) by three laboratory methods

Abstract

To alleviate insect pest problems in storage, synthetic pesticides are recommended; but their use may create toxicity to non-target organisms, development of resistance and residues in treated products. Under such circumstances, the need for research to find a safe, convenient, durable and economically logical method is necessary. The application of repellents could be considered as a new control method in storage. In this study, percentage repellency (PR) of Sirinol (garlic emulsion) was assayed on adults of cigarette beetles, Lasioderma serricorne (F.) and red flour beetles, Tribolium castaneum (Herbst) using three techniques, Petri-dish, Y-shape olfactometer tube and leaky glass. The insects were exposed to 0, 0.5, 1.5 and 10% concentration of Sirinol that is a botanical compound and PR of the adults was determined. In each of the three methods, the maximum PR of Sirinol was about 10% concentration, and the quantities were equal to 58.56, 42.58 and 26.29% for L. serricorne and 70.99, 55.47 and 38.72 for T. castaneum in Petri-dish, Y-shape olfactometer tube and leaky glass techniques, respectively. The interaction between concentration and time (concentration × time) was not significant for the adults of the two species. It was shown that T. castaneum was more susceptible to Sirinol than L. serricorne. Data analysis revealed that PRs of Sirinol were not significantly different between the time of 12 and 72 h.

Militia feruginaea solvent extracts on maize weevils and red flour beetles repellency; an implication to use them in storage pest management in Ethiopia

“…Similarly, Karunaratne and Karunaratne (2015) also indicated a significantly higher percent repellency of methanol, acetone, and ethanol extracts of M. viridis and O. gratissimum against C. maculatus. Several previous researchers have also been reported the repellent, insecticidal, or antifeedant, and development inhibiting effects of various plant parts, and their products on S. zeamais and T. castaneum with varying degrees of success (Amoh-Amoah, 2010;Arannilewa et al, 2006;Asawalam et al, 2006;Jahromi et al, 2012;Katamssadan, 2016;Lale, 2002;Muchiri, 2017;Nukenine et al, 2011;Tripathi et al, 2009;Udo, 2005).…”

“…It was also indicated that plant essential oils and/or solvent extracts contain several phytochemicals, and the repellency to insects is typically enhanced by the synergistic effects of the individual components on them (Zhang et al, 2013). Likewise, plants were revealed to be a principal basis of bioactive phytochemicals, with an exhibition of repellent, toxicant, and antifeedant effects on a variety of field and storage insects (Jahromi et al, 2012). And therefore, their extracted produces have been considered as alternative options for controlling insect pests (Tripathi et al, 2009).…”

“…Repellency test was conducted following the procedures adopted by previous researchers (Talukder & Howse, 1995;Obeng-Ofori & Reichmuth, 1997;Jahromi et al, 2012) using the area preference (A choice bioassay) method. The fine-dried powder of the test plant was diluted with respective solvents (ethanol, acetone, methanol, distilled water) (polar solvents), N-hexane (partial polar solvent), and chloroform (nonpolar solvent) to prepare 2.5%, 5.0%, and 10.0% solutions (Figures 3 and 4).…”

“…The insect pests that occurred on the treated (NT) and the control (NC) portion of the discs were quantified after 12, 24, 48, and 72 h, respectively. Percent repellency (PR) was calculated by the formula shown below (Obeng-Ofori & Reichmuth, 1997;Nerio et al, 2009;Jahromi et al, 2012). PR = [(NC-NT)/(NC+NT)] ×100 where NT was the number of insect pests on the treated portion and NC was the number of insects on the untreated area after the treatment application.…”

“…Repellency against insect pests is among the main motives that botanicals have been used traditionally used by the farmers under their grain storage. Repellents represent the plants biochemical that push away the insect pests from materials treated against them through motivating the olfactory or other receptors of the insect pests while causing less effect on the environment (Jahromi et al, 2012;Karunaratne & Karunaratne, 2015). Botanicals have been reflected to be harmless, as they pose a negligible influence on the environment, and human health, and as they reduce unwanted chemical remains on food grains that could be resulted from the use of synthetic insecticides (Rajashekar et al, 2012;Talukder, 2006;Talukder et al, 2004).…”