Yes, but probably not now. Ladybugs are about the best thing to get - they eradicate aphids in no time. However, that insecticide you sprayed will not only kill aphids, it will also kill ladybugs. You will want to check out the life of the insecticide, though likely it's longer than you need it to be right now. If it's too soon to get ladybugs, you will need to follow an aggressive plan. What kind of "aphid spray" did you get, and how often and how long can you apply it without doing damage to your plants? If it's too strong, you may want to spray down the plants once with it, then switch to insecticidal soap. Insecticidal soap is fairly gentle on plants.Â
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Note that the lifecycle of aphids is extremely fast, they multiply at an incredible rate. Some of their stages are rather impervious to insecticides, so frequent repeat sprayings is necessary. If using insecticidal soap you can spray every day. The big thing to know is that just because you don't see any doesn't mean they're really gone. You need to continue spraying for at least a couple weeks after you see no more, to ensure that you get those that are just beginning to hatch.Â
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If, on the other hand, you are sure it's been long enough that the insecticide you've already sprayed won't kill the ladybugs, by all means go for it. I order ladybugs from buglogical.com. You can find ladybugs on amazon, but I recommend against going there. The ladybugs I got through amazon were apparently very well-fed on something other than aphids - they simply walked over the aphids and ignored them. The ladybugs I got through buglogical, however, decimated the aphids in no time flat.
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Best wishes, which ever way you go.
PS - ladybugs not only eat adult aphids, but even eat aphid eggs and every stage in between.