## 4 Discussion  
The \"pest's food\" spectrum is extremely wide. It includes over 300 species belonging to various systematic groups, growing wild and cultivated, for example, under cover, from where they can move to the surrounding fields. In addition, the spider mite spends several generations per season and has an exceptionally high reproductive potential, which means that the development of the generation can even lead to a 100-fold increase in the population size! \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Year**} & \multicolumn{8}{c}{**2019**} & \multicolumn{8}{c}{**2020**} & \multicolumn{8}{c}{**2021**} \\ \hline \multicolumn{2}{c}{ \begin{tabular}{c} **Plant Protection** \\ **Protuct** \\ \end{tabular}  } & \multicolumn{2}{c}{**NO**} & \multicolumn{2}{c}{**C**} & \multicolumn{2}{c}{**V**} & \multicolumn{2}{c}{**E**} & \multicolumn{2}{c}{**O**} & \multicolumn{2}{c}{**T**} & \multicolumn{2}{c}{**NO**} & \multicolumn{2}{c}{**C**} & \multicolumn{2}{c}{**V**} & \multicolumn{2}{c}{**E**} & \multicolumn{2}{c}{**O**} \\ \hline \multirow{4}{*}{2019} & C & 1.43 & & & & & & & & & & & & & & & \\  & V & 2.62 & 3.20 & & & & & & & & & & & & & & & \\  & E & 1.67 & 1.31 & 3.41 & & & & & & & & & & & & & & \\  & O & 1.79 & 1.26 & 3.13 & 1.99 & & & & & & & & & & & & & \\  & T & 2.42 & 3.45 & 2.93 & 3.76 & 3.28 & & & & & & & & & & & & \\ \hline \multirow{4}{*}{2020} & NO & 5.55 & 5.74 & 4.24 & 5.68 & 6.23 & 5.77 & & & & & & & & & & & & \\  & C & 8.88 & 8.77 & 7.60 & 8.68 & 9.01 & 9.25 & 5.24 & & & & & & & & & & \\  & V & 9.41 & 9.43 & 8.00 & 9.22 & 9.70 & 9.79 & 5.02 & 2.70 & & & & & & & & & \\  & E & 6.66 & 6.85 & 5.37 & 6.77 & 7.12 & 6.24 & 2.56 & 4.80 & 5.16 & & & & & & & & \\  & O & 7.83 & 7.89 & 6.65 & 7.82 & 8.22 & 7.71 & 3.61 & 3.57 & 4.04 & 2.44 & & & & & & & \\  & T & 8.36 & 8.53 & 6.81 & 8.35 & 8.77 & 8.16 & 3.50 & 3.79 & 3.05 & 2.63 & 2.46 & & & & & & \\ \hline \multirow{4}{*}{2021} & NO & 4.23 & 5.40 & 4.71 & 5.14 & 5.16 & 4.43 & 7.49 & 10.89 & 10.88 & 8.65 & 9.75 & 9.90 & & & & & \\  & C & 3.90 & 4.87 & 4.60 & 4.75 & 4.45 & 4.36 & 7.81 & 11.15 & 11.23 & 8.98 & 10.05 & 10.30 & 16 Apart from beetroot the spider mite also feeds intensively on sugar beet, fodder and sugar maize varieties and their colonization is favored by the \"stay green\" feature, thanks to which the plants remain green for longer. Generally application of acaricides is adopted as a quick method to destroy the maximum number of mites and stop their multiplication. The strategic treatment schedule is applied once or twice per vegetation season (field plantations) to stop their development and multiplication. Mite control with chemical acaricides was a very popular method at one time and was partially successful, but the drawbacks of using synthetic acaricides include harmful residual effect on natural environment and can cause contamination of food, especially fruit and vegetables meant to be consumed when freshly harvested. Continuous use of acaricides also results in the development of resistance of mite strains. Mites are resistant to the most commonly used acaricides including organophosphates, pyrethroids, carbaminates, quinolines, carbamates, tetrazines, diphenyl oxazolines, quinazolines, phenoxy-pyrazoles, thiazolidines, macrocyclic lactones, pyridazones and pyrazole derivatives. In Poland, the assortments for use in beet are very limited. Only one preparation is registered--Ortus 05 SC, which fights only spider mite, not eggs. It works by contact and in order to be fully effective it must come into direct contact with the pest's body, which in practice is not that simple, and not only because of the \"protective spider web\". Beet plants, although sown in wide row spacing, at some point begin to form a thicket. The leaves overlap and a compact \"umbrella\" is formed, which makes it difficult to penetrate the field and thoroughly cover the bottom side of the beet leaves with the working liquid, which is the only condition for obtaining satisfactory results.