Keeping Insect Pests Out of the Vegetable Garden

comments (6) May 4th, 2015

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WesternGardener Jodi Torpey, contributor
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Broadwinged Katydids are much less destructive than their grasshopper relatives. They also help control small insects by eating them.
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Broadwinged Katydids are much less destructive than their grasshopper relatives. They also help control small insects by eating them.


Photo: Jodi Torpey

The best defense is a strong offense when it comes to protecting your vegetable garden against damaging insect pests. And the best offense starts at the beginning of the season by planning ways to control the insect pests that are most common to your garden.

Check with your county's extension office or master gardeners to get an idea of what insect pests to expect and when they might hit in full force.

Then prepare for battle by planting a diverse, layered landscape that includes the plants that attract beneficial insects. The more spiders, lady beetles and lacewings in the garden, the fewer problem insects you'll find hanging around.

Inviting hungry birds into your landscape is another good method for keeping insect pest populations from taking over.

Before planting, it pays to select the cultivars that are resistant to the most common pests for certain plants, like onion thrips on onion plants.

Then, as soon as you've planted, keep an vigilant eye on your garden to catch insect problems early and then take action quickly. 

Here are some easy, organic methods for keeping insect pests out of your garden:

  • Time plantings of crops, like beans, either earlier or later to avoid the first wave of bean beetles.
  • Use row cover cloth, tightly tied down, to protect young plants from flea beetles.
  • Keep juice cans or plastic cups with the ends removed to use as collars around small plants to prevent cutworms from crawling up the stems.
  • Keep the vegetable garden free of weeds where pests like to hide and feed.
  • Handpick beetles and tomato hornworms and drop them in a bucket of soapy water.
  • Use a forceful stream of water on both sides of leaves to dislodge and drown aphids and spider mites.
  • Deter slugs with irritants like coffee grounds, dryer lint or diatomaceous earth sprinkled around the base of plants.
  • Use sticky traps for pests like cucumber beetles.
  • Use cabbage collars on the soil around plant stems to protect cabbage root fly from laying eggs on cabbage plants.

What are the most destructive insect pests in your vegetable garden? What organic methods do you use to handle them?

posted in: insects

Comments (6)

ElisaDixon writes: Hey thanks for share
Posted: 1:28 am on January 26th
BridgetPearson writes: Thank you for sharing this! Save me so much time and effort. :) I was having a similar problem.
Posted: 7:50 am on June 26th
DreamGardener writes: And remember, if you find a tomato hornworm with what looks like little rice grains all over its back, Don't kill it! It has been parasitized by a Braconid Wasp! She has laid her eggs on it, and when they hatch, the babies will EAT the hornworm - and then they will grow up to parasitize More hornworms! Braconid wasps are some of the tiny, non-aggressive guys that you would never even notice. Beneficial insects are SO cool!
Posted: 10:37 am on June 10th
NashvilleStephanie writes: P.S. I LOVE katydids. They are too cute.
Posted: 4:06 pm on June 5th
NashvilleStephanie writes: I just bought some beneficial nematodes, and they were delivered to my mailbox and sat there until hot. (I had watched for them to be delivered to the porch, so did not think to check the mailbox.) Asked the manufacturer how I could know if the nematodes were alive; they only say if they don't work I'll know they died.

I am a new gardener. Totally ignorant and learning!!

I'm growing tomatoes, cucumber, squash, bush beans, lettuce, chard, beets, and peppers. I saw lots of Japanese beetle grubs in the dirt. LOTS. Also wireworm. I've picked off squash bugs and flea beetles. Still learning to identify pests.

Any helpful knowledge about nematodes? How to tell if they survived?

thank you
Posted: 4:05 pm on June 5th
WesternGardener writes: Thanks for your comments, and I'm glad you found the insect pest information helpful.

It wasn't easy to spot the katydid in my garden because of that clever disguise it's wearing. The destructive tomato hornworm also has good camouflage, which is the prime reason to always be on the lookout in the vegetable bed.

Posted: 10:02 am on May 12th
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