Repellence and fumigant toxicity of propionic acid against adults of Sitophilus granarius (L.) and S. oryzae (L.)

Propionic acid in bio-based packaging to prevent Sitophilus granarius (L.) (Coleoptera, Dryophthoridae) infestation in cereal products

“…The experimental trials conducted in this study demonstrated that, despite the favourable experimental conditions for insect infestation, propionic acid-loaded PCL and zein coatings significantly reduced the number of insect entering cartons filled with wheat kernels, confirming the compound ability to disrupt the mechanism of food location by granary weevils (Germinara, De Cristofaro, & Rotundo, 2008;Germinara et al, 2007). Moreover, results demonstrated that polymer composition influenced the repellent release, thus resulting in a different effectiveness between PCL and zein coating.…”

“…It is known to be very effective in inhibiting Gram-negative bacteria strains (Davidson & Juneja, 1990) and stored grain moulds (Milward, 1976;Raecher, Bern, Johnson, & Glatz, 1992), and in destroying surface-born fungal conidia that cause post-harvest decay of fruits (Sholberg, 1998). In a recent study it was shown that propionic acid is perceived by the antennal olfactory system of adult S. granarius and S. oryzae (L.), exerting strong repellent effects toward these two important pests of stored cereal-based products (Germinara, Rotundo, & De Cristofaro, 2007).…”

Repellents effectively disrupt the olfactory orientation of Sitophilus granarius to wheat kernels

“…In behavioral pitfall bioassays testing different concentrations of individual EAG-active compounds, at specific doses, five compounds (1-butanol, 3-methyl-1-butanol, pentanal, maltol, and vanillin) acted as attractants, while twelve [1-hexanol, butanal, hexanal, heptanal, (E)-2-hexenal, (E,E)-2,4-nonadienal, (E,E)-2,4-decadienal, 2,3-butanedione, 2-pentanone, 2-hexanone, 2-heptanone, and furfural)] acted as repellents suggesting that host finding behavior by the granary weevil more likely depends on the balance of positive and negative stimuli (Germinara et al 2008). Among previously identified repellent compounds, propionic acid and some short-chain aliphatic ketones were found to reduce wheat grain attractiveness to adult granary weevils (Germinara et al 2007(Germinara et al , 2012b. In the present study, hexanol and some volatile aldehydes, previously identified as granary weevil repellents, were assessed for their ability to disrupt the olfactory orientation of adult weevils to a feeding and oviposition substrate in twochoice olfactometer bioassays.…”

“…Control of granary weevil is difficult due to the endophytic development of immature stages that are well protected within grains from pesticides, the increasing legislation limits to the use of some fumigants and broad-spectrum contact insecticides, including the worldwide withdrawal from routine use of methyl bromide as a fumigant in 2015 under the directive of the Montreal Protocol on ozone-depleting substances, and the increasing consumer demand for safe food (Phillips and Throne 2010). As a consequence, the identification of bioactive compounds to be used for the implementation of current integrated pest management strategies is necessary (Isman 2006;Germinara et al 2007;Trematerra 2013;Li et al 2013).…”

Avaliação do uso de ácidos orgânicos na conservação de grãos de sorgo (Sorghum bicolor L. Moench) durante o armazenamento

“…A comparação de efeitos conservativos mostra não haver diferenças significativas entre os grãos tratados por incorporação de ácidos e os valores encontrados podem ser considerados de moderado a elevado conforme a Portaria 268/84 do Ministério da Agricultura (BRASIL, 1984). O caráter repelente dos ácidos utilizados exerceu influência determinante nos comportamentos verificados (ELIAS, 2002;GERMINARA;ROTUNDO;CRISTIFARO, 2007). Tabela 7.…”