Question: care of roses
I wanted to know how to apply the insecticide to roses?
only on the leaves or even on the flower itself?
Answer: care of roses
not all insecticides are the same, and not all insects have the same behavior. Aphids, mites, leafhoppers, sawflies, tend to feed on sap or other juices contained in the green parts of the plant; therefore they are completely disinterested towards flowers, and are often killed using insecticides by contact: that is, the insecticide is sprayed where the insects are, and must hit them to kill them. This type of insecticide is not sprayed on the flowers, first because they are generally broad-spectrum, and therefore should be used only when there are no flowers in the garden, otherwise apart from the aphids, you will also kill all the useful insects present on the flowers, such as bees . In addition to this, many roses have delicate petals, and if covered with insecticide on a sunny day, they ruin and blacken. There are also systemic insecticides, that is they enter the lymphatic circulation of the plant, and kill only the insects that feed on the leaves or stems, leaving the bees undisturbed on the flowers. It is clear that such insecticides must be used with caution, because if you spray the systemic insecticide lawn, you go to disturb the fauna that lives in the subsoil, and therefore generally should be used especially for potted plants. Other insecticides, often the biological ones, work as a deterrent, that is to say they have an odor or taste not liked by aphids and acres, and then they spray themselves on the green parts, where they form a film that remains for some time, dissuading insects from settle on your plants; even these insecticides should be used only when there are no flowers in the garden: bees do not like strange smells or substances present on flowers.
A typical parasite of roses, which attacks only the flowers, are the beetles, which eat whole buds, and especially love the light and fragrant flowers; baits and traps exist against these insects, because products sprayed on flowers are unlikely to be effective against beetles.