When you’re a gardener, you stop and smell the roses. All the time. And all the other flowers, too. I mean, you plant them to bring you joy, right?
So it feels like someone’s stabbing me with a knife, when I peruse my flowers one day and find this:
I don’t begrudge a few aphids to a few bits of my garden. The birds, ladybugs and ants often take care of them anyway, and their damage won’t kill a plant most of the time. I usually let them be, or I pick off a few infested leaves by hand and throw them away. But this was a serious infestation, that left several heliopsis plants wilty and in peril. Time to take action.
If you Google “how to get rid of aphids,” you will get a lot of advice. Here’s what I tried and how well each approach worked:
- Spray them off with water. This is the #1 recommendation. “Just fit your garden hose with a high-pressure stream of water and spray away,” I was told. “Most aphids can’t fly, and they are too small and weak to climb back up on the plant. If they don’t die from being blasted off the plant, they’ll die of starvation.” Sounded good to me. I blasted the plants with water thoroughly, taking care to also hit the undersides of the leaves, where the little suckers congregate. I noted, with satisfaction, thousands of aphid corpses on the ground. The next day, a conga line of red aphids covered the stems again. THIS METHOD DOES NOT WORK. Maybe for a few aphids, it would do the trick, but it does nothing to stop a major infestation.
- Spray a solution of water and dish soap. This #2 recommendation assured me that the soap would kill the aphids by suffocating them, yet it would not harm the plants or the bees. I mixed a solution of water and dish soap in a squirt bottle and sprayed away, again with special attention to the undersides of leaves. I noted with satisfaction many aphid corpses on the plant a few hours later. I also noted with agitation many alive aphids. I sprayed again. And again. I tried adding garlic and cayenne pepper to the mix. Still no dice. I’d kill some aphids, but more would appear, and some seemed temporarily stunned but not dead. THIS METHOD DOES NOT WORK EITHER.
- Rely on natural aphid predators. Many experts advise releasing ladybugs into your garden to watch nature at work. When I first noticed the aphids, I also noticed several ladybugs feasting on them. When I tried remedies #1 and #2, I shooed away the ladybugs so they wouldn’t suffer collateral damage. They did their part, but we’re talking tens of thousands of aphids vs. a few dozen ladybugs. How many aphids can a ladybug eat in a day? 50 or so, I read. How nice. Maybe I could try this sometime, before an infestation gets out of control, but I am not going to pay $30 and wait a week to get mail-order ladybugs when things are this bad. JURY’S OUT, BUT I AM MOVING ON.
- Live and let live. I found some gardeners who noted that there’s always an “aphid season” and if you just wait it out, the aphids go away on their own. SORRY, NOT HAPPENING.
- The best defense is a good offense. Aphids prey on weak plants and won’t attack healthy plants, I was told. To put it another way, if you have aphids, it’s your own fault. Accept the consequences and take better care of your garden. This seems unfair to me. These plants have been well-tended, fertilized and watered. SCREW YOU.
- Use an insecticide. No one but the insecticide makers recommend this. The gardening world is full of people who will tell you that some combination of remedies #1 through #5 will solve the problem. Maybe with a mild outbreak, sure, but with a full-scale infestation on my hands, I opted next for the nuclear option. I cut off all the flowers so that no bees would come by. Then I mixed up some concentrated pyrethrin spray, donned a mask and gloves, and let loose. Two quarts of spray later, I had a full-scale aphid massacre on my hands. I declared victory. The next day, I noted a few live aphids, but not many. I figured the insecticide residue would get them. It didn’t. It rained. The next day, a few more appeared. I squished them with my bare hands. I got the insecticide on my skin and enjoyed a numb sensation for a few hours. I marveled that the insecticide affected me – a 155-pound mammal – while teeny aphids lived on. A week later, the infestation was as bad as ever. INSECTICIDES ALONE DO NOT WORK.
- Scorched earth. At this point, I was beyond angry. I decided to literally cut the aphids off in their tracks. The plants would die – or at least be very sickly – anyway, and the aphids would spread elsewhere, so I might as well go scorched earth on their asses. The aphids clustered on the soft new growth while leaving the tougher old woody growth alone. I pruned the plants back to the woody growth, taking most of the new growth and all the flowers with it. I also weeded all around the base of the plant. Here’s what I had at the end of the job:
I had a nice paper sack of aphids after that. Some managed to escape the bag, only to die on the curb. Ha ha.
I sprayed more pyrethrin to kill off any stragglers.
Three weeks later, behold:
I still see a few aphids, and a few ladybugs, so I figure things are in balance, finally.
So, what REALLY works? Simply this – removing the aphids – physically – from the plant. Cut them off. Spray a little too, just in case. A healthy plant will grow back. You may lose a few flowers or fruits, but you will not lose your mind.