Answer: Luckily, just because you had aphids last year does not mean you will have them again this year. Modern pest management practices for aphids recommend waiting until a problem occurs and then treating if it is truly severe, rather than spraying preventively. You would need to keep an eye out and see if they reappear. The easiest way to remove aphids is to wash them off with a spray of water from the garden hose. Another option is to wait and let nature control them naturally -- when an aphid problem is severe, usually ladybugs will appear and eat them off the plants for you. Or, you can use an insecticidal soap per the label directions. Something else to keep in mind is that aphids tend to attack plants that have been overfertilized, so take care you are not overfeeding your plants. I hope this helps!
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