|Wasps for caterpillar control? Are you kidding?
by The Garden Goddess
|Got Questions?!Call the Garden Goddess toll-free at (888) 514-4004 or send email to her at gdngodsmill.net.The Garden Goddess is a trademark of The Organic Gardener's Resource and Design Centre of Encinitas.
ello fellow mulch spreaders. The Goddess is here this week to tell you more about biological pest control methods. This week's garden heroes are the parasitiod wasps of the family trichogrammatidae, and especially trichogramma pretiosum Riley, that little non-stinging wasp that can work wonders when it comes to caterpillar control in your garden.
Trichogramma pretiosum are beneficial insects that really mess up the dinner plans of pest caterpillars and other lepidopteran critters that can really damage a garden in short order. Corn ear worm, tomato horn worm, and cabbage loopers all can be controlled in the garden with less monetary expenditure than it takes to spray, and a lot less time is used releasing trichogramma into the garden than would be needed to apply a spray. The most important aspect of releasing trichogramma into the garden is that after release they continue to work until the targeted pest is controlled. This is how they work:
Nature is brutal, but very effective. Trichogramma wasps are probably the most widely released beneficial insect in the southwestern United States. It is used by smart growers of fruit, vegetables and ornamentals to control caterpillar and worm pests on their crops. The real beauty of this method of pest control is that the targeted pests can not develop a resistance to trichogramma like it could when a chemical pesticide is used. Trichogramma eats the pests there's no defense against that. Chemicals are as toxic to you as they are to the pests, and often ineffective against the targeted pest due to resistance. Instead of coating the garden with toxic substances, it seems logical to this goddess to have trichogramma working round the clock. The bad guys don't stand a chance.
When releasing trichogramma into your garden, it is good to wait until the first signs of a caterpillar or worm doing their business. This will ensure that you have a food source for the wasps when they are released.
Releasing trichogramma is very simple. When you purchase the insects, they come to you as parasitized moth eggs. You just hang the little strips on a branch in the vicinity of your caterpillar problem and forget about it. Trichogramma is on the job!
Adult trichogramma wasps are nectar and pollen feeders, so it is a good idea to plant nectar-rich flowering plants like any of the mint family; they really like the flowers of the dill weed as well. So do some companion plantings of these kinds of plants for your benefit as well as for trichogramma's well being. This will help to keep the adults from finding a source of nectar outside your garden, and I'm sure many of you can find a use or two for fresh mint or dill in the kitchen. Everybody wins except for the bad guys. I like stories like that, don't you?
Next week we will be discussing late summer care for your rose garden and how to get a few extra weeks of bloom before letting them rest. Come up and see me sometime.