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Larry McMahan


This is great news to me! My swiss chard has been ravaged by these pests this years. It just happens that I have been spraying my Cherry tree for Spotted Wing Dorsophila (Cherry Vinegar Fly) with Spinosad. I will just start spraying any chard which I plant also. I was wondering what I was going to do other than wait a year or two for the leafminers to leave. Great info!

Lynette

I too have had this problem with my beets and chard for about two years! I read an article in the Chronicle regarding this pest, and have been picking the leaves faithfully but nothing has made it stop and it's now almost December. I have even tryed food grade DE like I use on my brasicas! Next step will be the Bulls-Eye as we love our greens!

Pam Peirce

Hi Keith,

I am perplexed by your "unseen bugs." By skeletonized,do you mean they ate all the leaf except the midrib and large veins? Can I ask where you are gardening? Are you in the SF Bay Area? Have you looked at your chard at night, with a flashlight to check for nocturnal pests? I'd like to figure out what the pest is before you choose a pesticide.

Keith

I had unseen bugs that skeletonized the leaves of my Swiss Chard this year. The "frass" mentioned in the article was present at the end (before my plants died!) I think most of the larvae were gone by the time I tried harvesting, and even the stems seemed damaged. This was the first year I had this problem, as Swiss Chard is pretty reliable normally. Also, in answer to the previous post, none of my lettuce was affected - just the Swiss Chard. I may try some rotenone next season as it breaks down fairly quickly before harvesting.

Richard

This information has saved me a trip to the nursery and I thank you for that. I also have romaine and red leaf lettuce in the garden and currently haven't seen any problem yet. Do they eat lettuce too ? Thanks for any help.

Teri in Minneapolis

Sticky paper also helps by trapping the flies and interrupting the reproduction cycle. I remove the leaves that have been mined or just the affected parts on larger leaves. Early intervention is important--if you catch it early the odds of success are better. Bulls Eye sounds fishy to me! Neem is supposed to help but I had no luck with that.

chard man

Leaf miners are no problem. Wash the eggs of the leaves every few days. If you somehow miss one and they get into the leaf, cut the mined part right out of the leaf.

I have a 100 percent success rate this way.

pam

Charlene,

You can't get rid of leafminers by washing the leaves. The larvae live inside the leaf, between the top and bottome "skins" of the leaf. They lay eggs at first, on the outside of the leaf, and you can brush these off, but then the eggs hatch and enter the leaves.
The leafminer larvae wouldn't survive being eaten by you. They are totally incapable of surviving inside you and do not parasitize anything but spinach, beets, and Swiss chard. Most people wouldn't want to eat them due to the ugh factor, but they would just be, as they say, extra protein, nutritionally speaking.
In order to avoid eating them, most people would cut away the part of the spinach or chard leaves that had damage, problem being, of course, that if spinach leaves aren't very big, you might not have much left to eat.
There is more on this pest in later posts, including ideas for controlling it. Do a search for "chard" to find them. There are photographs.
Yes, gardeners often, within reason, wash off the pests and eat the rest, but this one is a hard one to deal with once it is in there.
If you don't mind, I would like to consider your question for a column that I write for the SF Chronicle (and sfgate.com).

charlene

I have a question, as I am a new gardener. Is it OK to eat spinach that has had the leafminer larvae on it? I have just painstakingly washed, leaf by leaf, a small harvest of spinach, brushing the larvae off each until I am sure they're gone. The last thing I want is to contract a parasite. I don't know what is safe or standard practice in terms of eating from an imperfect garden. Advice??

charlene oneil

where to buy bulls-eye in Bay area?

pam

I don't have any info about boric acid and leafminers. Boric acid is effective against ants. The link provided in the previous post is a link to a site dealing with indoor pests, not garden pests. I don't recommend use of boric acid for leafminers in the garden.

dee

Boric acid is very effective against these pests . From http://pests.in

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Golden Gate Gardening

The new, updated and expanded third edition of Golden Gate Gardening has more of the information you'll depend on about California microclimates, soils, container gardening, vegetable varieties, herbs, edible flowers, cutting flowers, fruits, managing pests and weeds. Now includes 4 planting calendars, 2 for cool summer microclimates, plus 2 for more inland microclimates. More recipes and tips for learning to harvest and eat from a garden too.

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These common and easy to grow California garden plants are being reclaimed by current garden designers for their beauty and sturdiness. Learn how to grow them well, care for them throughout the year, and use them in your garden for reliable, drought-tolerant, year-round color.

Mar 31, 2006

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