Here are some methods you can use to tackle their attack.
Treat your plant with horticulture oil from time to time.
Spread beneficial insects like ladybugs, lacewings, and parasitic wasps around your plants.
These insects feed aphids and reduce their population. You can buy these bugs online.
Use companion plants in your gardener that are helpful to resist pests.
The catnip plant is a natural repellent for aphids. Plant them beside your vegetables or fruits to keep them away.
These pests are especially attracted to mustard and nasturtium plants. You can plant them on the other side of the garden so that all pests go there. Remember to check they are not transferring. You can use pesticides to kill them when they are in mustard and nasturtium plants.
Plants like chive and garlic repel aphids when planted near peas, lettuce, and rose bushes.
Spray cold water: you can directly spray cold water in affected parts from the water horse. But, don’t put water pressure on young plants, their stems might get damaged.
Use can treat the stems with dusty flour. Flour acts as a flour removal.
Neem oil is effective on pests. You will easily find neem oil in the online market. Before using them must read the instruction from the packet.
Killing aphids with soapy water. Mix soap (Castile) with mild water and put it in a spray. You have to treat plants with this solution every 2 days for 2 weeks. This homemade method has a very high success rate.
Make an oil solution mixing 4-5 drops of each clove, peppermint, rosemary, and thyme with water. Put the solution in the spray and spray it to affected parts of the plant.
Kill them with vinegar. Take a spray, fill ⅓ with white vinegar, and rest with water. This will kill aphids as well as larvae on contact.
If the problem does not get solved with these homemade methods you can use a non-organic material called Diatomaceous earth (DE). It kills the aphids fast but doesn’t apply them in a blooming plant as it might be harmful to pollinators too.