Friday, August 1, 2014
PLACERVILLE, CALIFORNIA
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Grow For It! Garden whodunnitts: Insect ID on the Web

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From page B10 | June 23, 2014 |

It was a dark and stormy night. No, wait, it’s a bright sunny day and you are inspecting your veggie garden, fruit trees or some favorite plant in your yard. That’s when you see it: a bunch of murdered leaves. So, whodunnitt?

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Help?

You consider your list of causes: maybe I didn’t water correctly, maybe there is a problem with the soil or maybe a disease is spreading through my yard.

But look. Right there is a bunch of insects on the damaged leaves, or maybe a single insect or a caterpillar. Aha! What would Sherlock do now?

Sherlock would definitely find out the truth — and you, as a good gardener, would want to make a correct identification before taking action.

Why? You don’t want to hurt any good guy insects that are out there defending your garden day and night (for free). If your suspect is in fact the one doing the damage, you want to use the right control method. Otherwise you might do more harm than good and still not get rid of the bad guys over the long run. You could even make the situation worse.

What to do?

Get out your Sherlock hat and magnifying glass (forget the pipe) and play detective.

First, get a sample to work with. You can collect your suspect(s) in a jar or plastic baggie or take some close-up photographs with a camera.

Second, take a good look at your sample. Is it a caterpillar or adult-form insect? How many legs does it have? What plant was it on when you found it?

Many insects are very small. For example, thrips on a leaf will look like a dusting of black pepper. You might need some kind of magnifier, such as the zoom on your camera or a magnifying glass.

Third, identify your sample. These Websites are very useful:

The “Invertebrates Menu” at the University of California, Davis site for Integrated Pest Management, at ipm.ucdavis.edu/PMG/menu.invertebrate.html.

Bugguide, hosted by Iowa State University Entomology, at bugguide.net. Click on one of the 28 “bug” silhouettes in the box at the upper left, matching your sample, then scroll down to “Identification.”

Insect identification Webpage of Texas A&M University, Department of Entomology, at insects.tamu.edu/extension/insctans/identification/. Click on the ID method you prefer.

Maybe the suspect is innocent and the real culprit has left the scene. These will help you recognize the good guys:

A poster called, “Meet the Beneficials — Natural Enemies of Garden Pests,” found at ipm.ucdavis.edu/FAQ/natural-enemies-poster.pdf.

A clickable list of insects that eat other insects (predators) or lay eggs in the bodies or larvae of other insects (parasitoids) available at ipm.ucdavis.edu/PMG/NE/index.html.

Fourth, decide what to do. If it is a good guy, just put it back or leave it alone to do its job in the garden.

Otherwise, look up “best practices” for controlling it at the UC Davis site for Integrated Pest Management at ipm.ucdavis.edu/PMG/menu.homegarden.html. This site recommends methods that are both effective and do the least harm to your garden’s ecosystem.

“Quick Tips,” which are short summaries of recommendations about dealing with specific pests at ipm.ucdavis.edu/QT/index.html;

“Pest Notes,” which are 4-5 page summaries of the research on controlling specific insects and other pests at ipm.ucdavis.edu/PMG/PESTNOTES/index.html.

Fifth, smile. You have just visited the amazing world of insects.

Although insects seem very different from us — they breathe through holes in their bellies and can smell through their feet — they are also a lot like us. Their muscle tissue is much like ours and their nervous system cells work much like ours. What’s more, we think alike. The shapes and colors and perfumes that attract insects to flowers are also beautiful and fragrant to us.

Insects are the most common type of animal on the planet and are essential to natural ecosystems through recycling of decaying matter and plant propagation (including pollination). They also provide food for birds, mammals, fish and reptiles.

Given their overall benefits, it seems worth taking the time to do a little sleuthing and find the best ways to control any unwanted insect activity in our gardens.

Master Gardeners of El Dorado are available to answer home gardening questions at local farmers markets and at the office Tuesday through Friday, 9 a.m.-noon by calling 530-621-5512. Walk-ins are welcome at the office, located at 311 Fair Lane in Placerville.

For more information about public education classes and activities go to the Master Gardener Website at ucanr.edu/sites/EDC_Master_Gardeners/. Sign up to receive the online notices and e-newsletter at ucanr.edu/mgenews/. You can also find Master Gardeners on Facebook.

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