Frequent Inspection. Catch them early. One “colonizer” can produce up to 80 offspring in as little as a week and is capable of doing so several times. Slowly walk through your garden several times a week paying close attention to the underside of leaves. Also check for aphids on newly purchased plants and transplants.
Don’t over fertilize. Aphids prefer the new growth that is found in abundance in overly fertilized plants. Use only slow release fertilizers. It is also a good idea to grow plants inside or under a cover until they are large enough to be a little more tolerant.
Spray with water. A strong spray of water is an effective way to dislodge aphids from your plants. Most dislodged aphids will be unable to return to the plant. The Bug Blaster is a hose attachment that works great for this.
Home remedy for aphids. You can kill aphids by spraying, especially under the leaves, with a solution of 2 tsp mild dish or laundry soap to a bottle of luke warm water. The soap washes off the aphid’s protective waxy coating and causes dehydration. You can also mix three parts luke warm water to one part vegetable or horticultural oil and a couple drops of dish soap. This mixture can be sprayed on to clog the respiratory spiracles of aphids. Spray once a week taking turns between solutions. If using these solutions on food plants, be sure to wash them before eating. If using the oil solution, don’t spray on very hot and sunny days as the oil can magnify the sun and possibly harm the plant
Prune away colonies. Aphids maintain the right to assemble. If you see a section of the plant containing aphids galore, snip it off and dispose of it. It doesn’t cure the problem but it will slow the advance.
Bring in predators as an organic control of aphids
Aphid predators are a natural way to kill aphids. These include lacewings, ladybugs, and aphid predator (which is an actual bug called that). Introduce these beneficial bugs to your garden as a natural way to kill aphids. Planting mint, fennel, dill, yarrow, clover, and dandelions will also attract these insects to your garden.
Grow plants for a homemade aphid control
Growing plants that are especially attractive to aphids can actually help with a serious aphid infestation. Plants like nasturtiums, asters, mums, cosmos, hollyhocks, larkspur, tuberous begonias, verbena, dahlias, and zinnias are very attractive to aphids and are especially good for organic control of aphids. Grow these plants away from the plants you wish to keep aphids off. They will act as a lure, keeping the aphids away from the plants you wish to keep aphid-free.
You can also try planting garlic or onion plants nearby the infested plants. The smell of these plants drives the aphids away. You can plant garlic and onions in pots for mobile homemade aphid control.
Combine these controls for a super homemade aphid control
While any of these methods will work for getting rid of aphids, combining them will increase their effectiveness as a natural way to kill aphids.