engleski

Laboratory testing of two diatomaceous earths against red flour beetle

The aim of this study was to determine the insecticidal efficacy of the two diatomaceous earths against red flour beetle Tribolium castaneum (Herbst) on wheat and to determine their optimal dose. Laboratory testing was conducted using three doses (250, 500 and 750 ppm) of two diatomaceous earths: SilicoSec® and Celatom Mn-51®. Wheat (100 g) with moisture content of 14.2% was treated with both diatomaceous earths, respectively, in glass jars (200 ml) followed by the introduction of 20 adults of red flour beetle of different sexes aged 7-21 days. All treatments were set up in four repetitions. The mortality rate of red flour beetle was recorded after 7 and 14 days. Significantly higher mortality rate compared to control treatment was achieved at the 7th day of exposure at the highest dose (750 ppm) for both diatomaceous earths. A significantly higher mortality rate was also observed by prolonging the exposure at 750 ppm for Celatom Mn-51® and at 500 ppm for SilicoSec®. The highest mortality rate (81.25 %) in treatment with SilicoSec® was achieved with 750 ppm after the 14th day of exposure, while the highest mortality rate achieved with Celatom Mn-51 was 55.0 % with the same dose and exposure. The results indicate on high efficiency of the investigated diatomaceous earths in suppression of red flour beetle on wheat. Further research is required on the impact on offspring development as well as testing combinations with botanicals for better insecticidal efficacy.

diatomaceous earth ; insecticidal efficacy ; SilicoSec ; Celatom Mn-51 ; red flour beetle

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