are they closer to guns or roses?
Matej Podgornik Milosavljević (Author), Monica Novljan (Author), Iztok Jože Košir (Author), Aleksander Horvat (Author), Urban Šilc (Author), Christos G. Athanassiou (Author), Tanja Bohinc (Author), Matej Vidrih (Author), Stanislav Trdan (Author)

Abstract

We tested the insecticidal efficacy of different powders as surface treatment against the rice weevil (Sitophilus oryzae) adults. We have applied dusts from five invasive alien plant species (Solidago canadensis, Solidago gigantea, Amorpha fruticosa, Rhus typhina, Ailanthus altissima) and two inert dusts, i.e. wood ash from Norway Spruce (Picea abies) and commercial product SilicoSec® (as diatomaceous earth). Mortality was evaluated from 1st till 7th day after exposure, at 20 and 25 °C, two values of relative humidity and two doses (20 and 40 g/m$^2$). After Day 7, alive beetles were placed into clean Petri dishes, and mortality counts were measured from 8th till 14th day. In general, we have detected poor efficacy of plant powders against S. oryzae. SilicoSec® at 20 g/m$^2$ caused 100 % mortality at 25 °C and 55% RH, after seven days. Wood ash (13.46% SiO$_2$) was less effective in comparison to SilicoSec® (79.48% SiO$_2$), as approx. 60% mortality was recorded at the same conditions. We have detected that leaves of A. altissima and flowers od S. gigantea are rich with polyphenols (like catechin hydrate), on average almost 17 mg/g in S. gigantea flowers. Flowers and leaves of Solidago species are also rich with essential oil, like beta-copaene. The results of our research indicate that the powders of invasive plants are closer to fragrant roses in controlling S. oryzae adults, while the gun for this pest is only diatomaceous earth. To improve the effectiveness of invasive plant products, we suggest testing their independent effectiveness in liquid form as well as combinations of their essential oils with inert dusts.

Keywords

Sitophilus oryzae;diatomaceous earth;wood ash;invasive alien plants;insecticidal efficacy;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 632
COBISS: 181538051 Link will open in a new window
ISSN: 0022-474X
Views: 267
Downloads: 19
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Other data

Secondary language: Slovenian
Secondary keywords: skladiščni škodljivci;rižev žužek;skladiščeni proizvodi;diatomejska zemlja;lesni pepel;invazivne tujerodne rastline;insekticidna učinkovitost;
Type (COBISS): Article
Pages: 11 str.
Volume: ǂVol. ǂ105
Issue: ǂart. ǂ102245
Chronology: 2024
DOI: 10.1016/j.jspr.2024.102245
ID: 22427656