In this study, we studied the insecticidal activity of powders of four different invasive alien plant species under laboratory conditions, namely: 1) false indigo (Amorpha fructicosa), 2) tree of heaven (Ailanthus altissima), 3) Canada goldenrod (Solidago Canadensis) and 4) staghorn sumac (Rhus typhina), used alone and in combination with wood ash and diatomaceous earth. The goal of the task was to study the effectiveness of powders of four invasive alien plant species and combinations with wood ash and diatomaceous earth for the control of rice weevil (Sitophilus oryzae) at different temperatures and different air humidity values. The insecticidal action of the selected powder formulations and the effect of the prepared formulations were studied at two different temperatures (20 and 25°C) and at two values of relative air humidity (Rh) (55 and 75%). Wheat was mixed in various combinations in larger erlenmeyer flasks. We found low mortality in the independent use of plant powders. Diatomaceous earth showed high efficacy when used alone, but when we reduced the concentration in the combinations with plant powders, the efficacy dropped. This means that there is not enough synergy between plant dusts and diatomaceous earth. On the other hand, we found satisfactory efficiency in the use of wood ash, both in single use and in combinations, against rive weevil.
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