Probably the most well-known pest in domestic gardens is the greenfly. Greenfly are often to be found in whole colonies on the tips of shoots or the undersides of leaves of crops and decorative plants. Greenfly damage plants by extracting phloem sap or cell sap from them by suction. The leaves and shoots are thus deformed or discoloured. In addition, excreted substances containing sugar can attract ants, as they like to feed on this so-called honeydew.
No chemical substances are required to control this. It is often sufficient to create good living conditions for the natural enemies of greenfly, e.g. ladybirds or lacewings and their larvae. Meanwhile, these natural enemies are even specially bred and sold in shops as eggs or larvae. Another possibility is to plant special herbs, for example savory or lavender, as these repel certain greenhouse species – but unfortunately not all.
If all this has no effect and your plants are stubbornly infested with greenfly, you should first spray the affected plants with water. This washes the greenfly off the plant and often, in their search for a new source of food, they are eaten by beneficial organisms. Stinging nettle stock is also a useful means. If plants are sprayed with stinging nettle stock, the leaves are given a hard surface, so that the greenfly can no longer attach itself by suction. Apart from the greenfly, there are of course a large number of other pests, such as the snail, which we will not discuss in detail here, however.
The following generally applies: to minimise infestation with pests in your garden, you should ensure that you have as many different types of plant in your garden as possible. With monoculture, a massive spread of certain pests may occur. Therefore, ensure an ecological balance in your garden!