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ckingsbury64

Stopping unstoppable aphids

7 years ago

I'm growing tomatoes, cucumbers, eggplants, peppers, and assorted herbs on an urban balcony in Boston. The last two years, aphids murdered most of my peppers and eggplants, and I'm preparing myself for another siege this season.


I've tried insecticidal soap, pyrethrin spray, and a mix of the two. On a 7-day application interval the herd would initially thin out but by day 7 we were back where we started. Daily applications of soap helped a little but not enough to allow the plants to grow much.


Because I'm hundreds of feet above the ground, I don't get much in the way of beneficial insects. Considered buying ladybugs, but not sure if my neighbors two feet away on either side would appreciate hundreds of them flying around. I keep reading things saying that cilantro repels aphids, well, last year they hit my cilantro so bad I pulled it out and tossed it.


I've read about Bayer Advanced (i.e. Imidacloprid) but am a little hesitant to use it out of concern for the couple of bees that somehow find my plants two hundred feet up in the middle of the city. I haven't tried malathion yet as it's a bit nasty and I've read conflicting reports on its effectiveness on aphids, but I'm not entirely opposed. Somebody elsewhere recommended flupyradifurone and bifenthrin, but I'm only finding those in "professional" quantities. My garden store also carries Bonide 8 (lambda cyhalothrin) which I haven't tried yet and some reviews say it worked.


Any suggestions greatly appreciated!

Comments (6)

  • 7 years ago

    Water works as well as anything. Are you able to hose down your plants with a strong stream of water? That along with some daily hands-on squishing or rubbing off should keep things under control if not eliminate the problem entirely. I just personally have issues using a lot of insecticides on plants I intend to eat :-)

    And be sure not to over-fertilize....a lot of vigorous, fertilizer-induced growth is very attractive to aphids. I prefer to run a little lean.

  • 7 years ago
    last modified: 7 years ago

    I agree with gardengal; skip the poisons and go to water. If you can get rid of the first and second flush of aphids - before they lay eggs - usually helps the situation for the rest of the year.


    Also, your spraying insecticides will only keep away any beneficials that might want to help.

  • 7 years ago

    Aphids don't lay eggs during the growing season. At that time of year, they bear live young -- one every 20 minutes!

    To keep ahead of aphids you must have healthy plants in good condition, then you must check every day. Missing just one aphid with the water spray,or pesticide, can be the reason you have a new herd by the net day.

  • 7 years ago

    I appreciate the suggestions but I think you guys haven't seen my location or experienced my aphids. When I pulled my cilantro out last year I couldn't count the number on a single stalk. Pepper leaves had hundreds. I think I have eggs everywhere as they started appearing even as I started seeds in peat pellets indoors.


    I don't have running water outside nor do I get beneficial insects naturally. I'm on a 20th-floor balcony surrounded by parking lots, highways, and other buildings. I strongly suspect the only way a ladybug ends up here is if they get blown up by the wind. I'm not totally opposed to trying to release a limited quantity but from what I've read the effectiveness of that is limited.


    As for spraying, I've tried using a hand sprayer up close for the same effect without much luck. I just have too many and so they reproduce faster than I can kill them.


    I don't *think* I'm over-fertilizing, but not sure I'd know. I mix osmocote and some compost in the potting mix and then start applying a liquid fertilizer (like a 3-2-2) weekly mid-season. I had an analysis of my mix done at the start of last season and my nitrogen was pretty low and I have high PH due to alkaline water supply.

  • 7 years ago

    ck, what kind of eggs? I'm not at all sure that you've been seeing aphid eggs. Maybe something that will eat the aphids.

    Please don't purchase ladybugs to solve your aphid problem. Some irresponsible companies are still using the Asian ladybug for their mail order businesses, an invasive insect now classified as a household pest and a threat to native species.

    They will also flee your balcony plants within moments of release.

    Speaking on behalf of your neighbors, please do not use the chemicals! They are truly hazardous, and not just to the bees.


  • 7 years ago

    Cutting back on the fertilizer might help reduce your aphid load. And spraying with something stronger than a hand sprayer might be more effective, if it's possible given your location.