Additionally, consumers consider the absorption of certain plant protection active substances to be something constant, and product brochures do little to dispense with this notion. However, it helps to realise that the rate of absorption via the leaf surface of locosystemic (translaminar) and true systemic active substances (which move through vascular bundles) varies. The effects of the waxiness of leaves are well-known in other environments, thus mainly when treatments are held off for a few days after heavy rains to protect the culture crop and wait for the necessary waxiness to be replaced.
The wax layer (fatty acid – esters – cutin) can decrease the attainable pesticidal effect when using non-contact pesticides, acaricides, and fungicides. This is especially disadvantageous when battling burrowing pests and pests that cause damages to hard-to-reach plant areas or within the plant tissue.
Currently, there are no systemic acaricides that have systemic effects; once applied to the plant, they work as contact or as translaminar products. Due to the fact that spider mites most frequently start reproducing on the more protected undersides of leaves, getting the spray to the mite habitat is a difficult challenge when spraying. The selection of a good adjuvant is therefore especially important when using acaricides. Practical experience shows that oil-based adjuvants are the most common, which can be used to realize significant increases.