Teaching “Grow a Homestead-Style Food Garden” every fall and spring, I invariably learn all kinds of new tips about food gardening! My recent class was no different: the students brought all kinds of interesting questions and insights…this time, mostly about pests and pest control.
And specifically, non-chemical gardening strategies.
Beer works for slugs! |
Since we reside on the mossy side of the Pacific Northwest, slugs are probably our most pernicious pest. As usual in my classes, the topic of slugs came up right away. One student had a garden full of strawberries, but said every year, the slugs eat every last berry!
Now, there’s all kinds of poisons available—but who wants their berry bed full toxic substances! Another student raised her hand.
“Beer,” she said. Lots of other students chimed in, in agreement. I had actually heard long ago that setting out shallow dishes of any kind of beer is a fail-safe, non-toxic slug killer! The slugs come crawling…then will drown themselves in no time flat.
Or maybe they just get pickled in the alcohol. Either way, it works!
Another student looked rueful. “Just make sure you empty the dish frequently,” she said. She confessed she’d gone a couple of weeks without dumping out the dead critters…and it was unspeakably gross!
Since my husband and I don’t keep beer around, and we’ll never remember to buy any, I use “Sluggo,” safe for organic gardens. This product is iron phosphate, which is somehow tasty to slugs, but doesn’t really poison them. Instead, it gives them a stomachache, and they’ll just crawl off somewhere to kick the bucket.
Pest Control Products: Neem Oil, Diatomaceous Earth and Beneficial Nematodes
Several students were interested in manufactured products for food crop pests, and mentioned neem oil and diatomaceous earth, two manufactured products that are generally considered safe to use. My research indicated that yes, both are considered no-toxic.
Neem oil is from a neem tree, and apparently you can mix it with water and spray it on both soil and plants to kill pests. Diatomaceous earth is a powdery formula of some kind of silica compounds, which are abrasive to insects’ exteriors. I understand some people use it inside their home.
It doesn’t sound terribly toxic, right? However, neem oil can cause stomach upsets in humans, while diatomaceous earth can irritate the lungs.
Beneficial nematodes are basically tiny critters that live in the soil and eat the pests’ eggs and larvae. They come in a powder, a refrigerated package, and you mix the powder with water.
I mentioned these in earlier posts—for 3 or 4 years in a row, John and I faithfully deployed beneficial nematodes to address the apple maggot infestations in our orchards. Sadly, the nematodes seemed to have no effect.
The one method that has worked for us is thinning the apple tree thoroughly, then stapling a Ziploc baggie around each remaining apple while it’s about the size of a quarter. The apple maggot moths, nor their larvae can penetrate the plastic!
My own position is to use natural methods of pest control. We use sprigs of mint to repel ants and mice, and have several small patches of peppermint around the yard—one, we’ve planted next to the house foundation, a spot where ants like to enter our house!
Also for ants, you can set out a mixture of cornmeal and cayenne. The ants love the corn, but the grain will swell in their digestive tracts. Plus cayenne pepper won’t go down easily either!
You can used soapy water on aphids, and hand-pick larger pests off your veggies.
I learned another insight earlier this spring: healthy plants repel pests best! If you build healthy soil, with lots of organic matter and natural fertilizers like compost, you’ll have healthy plants.
That made perfect sense to me. We don’t use any pesticides, herbicides or fungicides in our garden, and have very few pests…
You can do any easy search on this blog for more in-depth articles using beneficial nematodes, and the Ziploc technique!