1, spraying chemicals
If you want to completely eliminate aphids, you need to spray pesticides on plants in time. You can dilute the leaves with omethoate emulsion and water and spray them twice every month to kill aphids.
Step 2 Remove it manually
When removing aphids, you can use a toothbrush or discarded old towels to soak them in soapy water, brush them off, and burn budding insects and used towels to curb the spread of aphids.
Step 3 spray plant essential oil
There is also an effective way to kill aphids, which can be mixed with mint, rose essential oil and neem oil, diluted with clear water in proportion, and sprayed on the leaves infected with aphids every half month, which is not as strong as pesticides.
Harm of aphids
Aphids are omnivorous and have many hosts. The overwintering hosts are mostly Rosaceae woody plants, such as peach, plum, plum, apricot and cherry. In summer, most of the hosts are herbs, including not only vegetables such as Leguminosae, Solanaceae, Cucurbitaceae and Cruciferae, but also many biennial herbaceous ornamental plants, especially greenhouse flowers.
Aphids will suck juice from the leaves, stems and young spikes of plants, which will make the leaves yellow and the plants shrink, thus leading to plant death. Moreover, some species of aphids will parasitize on the roots of plants, causing nodules on the roots of plants, which will lead to root rot and death of plants.
Aphids can spread diseases among plants, leading to large-scale death of plants from diseases. For example, aphids can spread mosaic disease in tomatoes and potatoes, and aphids will secrete a kind of hoarfrost when they are full. Frost will cover the leaves of plants and affect the photosynthesis of plants.