Posts Tagged 'Aphids'

Ants, Roses and Religious Freedom

I’m usually glad when I answer the business line on the weekend even though we’re officially closed. Customers often present questions that I’m happy to help unravel. Sometimes new inquiries make my day, like last Sunday. A young woman’s voice asked, “Are you open? I need aphid controls.” It soon became clear to me that she really needed ant controls. It became clear to her that she really wanted to come over and learn about it eye to eye. A bright curiosity in her voice drew the OK out of me.

She was actually calling for her boyfriend and his 16 young citrus trees and roses. They were at the local nursery weighing a decision to buy the spined soldier bug eggs (the ones that utlimately come in the mail) to control argentine ants that they were sure occupied their greater neighborhood. They got a tip to give us a call first.

What a delight! They absorbed new insights about insect ecology so fast! It was charming how he admitted being a perfectionist about his trees. He decided on both an AntPro and AntsNoMore bait stations, Gourmet Liquid Ant Bait AND the granular bait laced with insect growth regulator. My description of the triple jeopardy for ant mounds turned over with a shovel was all he needed to feel armed for battle. He had the confidence to conquer the millions of ants in his little orchard. Still, he said he was worried and made another joke about being a perfectionist. I pointed to the blurbs about Rhizoboost and Microbe Nutrients in our Catalog. Spraying the bacteria on the rose bushes can interfere with the rust he was worried about as well as stimulate the food web in the root zone. But for now, we decided to concentrate on the ant campaign.

As I finished getting payment information, I learned that they are Persian-American Moslems. She was fasting. I said, “That’s why your face is radiant.” They were curious about the photo of ‘Abdu’l-Baha on a high shelf above my desk. His clothing is turn of the last century Persian. Four eyes fixed on ‘Abdu’l-Baha. I said, “He is the son of the prophet founder of the Baha’i Faith.” They looked left and right, “There are Baha’is around here!!?” “I’m a Baha’i,” I said. Eyes wide, was I also fasting for Ramadan? I said that God is merciful, for Baha’is the fast is only 19 days. It ends at Naw Ruz. We agreed on how we love the fast, the feeling of lightness, the quality of prayer at the end of a day, more clear than prayer during the rest of the year.

I turned my monitor towards them, “Iran just sentenced seven Baha’i leaders to 20 years solely because they are Baha’is.” She said, “My mother told me about that! It’s terrible.” I just got this announcement. Amnesty International provides a mailing address where we can plea to the Iranian government. The youth said that unfortunately nothing like that would do any good. “You can’t change them. They are just crazy.” She said it with such assurance and finality I was riveted.

Through diligent and persistent attention they will nurture their trees and roses to optimum health. What explains being so full of optimism about trees and roses achieving perfection and so cynical about one’s people respecting religious freedom? I want to urge them to also take a stand for justice in Iran. Tweet freedom songs for the Baha’is during Ramadan.

-Jan Dietrick, Manager

Ant Control Weather

When the temperature starts dropping it’s time to go on the offensive against ants. Ants are one of the biggest overlooked factors that lead to biological control failures. Many common species “farm” honeydew producing pests, including aphids and mealybugs. They eat and fight off predators, transport pests to new areas, and will even shelter aphids and mealybugs inside their ant mound. Cooler temperatures slow ants down, making them more vulnerable to attack by the vigilant farmer.

Formica ants on AntPro

Formica ants visiting AntPro bait station

One of the most effective control measures is baiting ants with low toxicity ant baits. We recommend using bait dispensers filled with liquid boric acid baits for sugar feeding ants. Dry granular borate ant baits can also be used. Boric acid won’t kill the foraging ants immediately, letting them bring the poison back to the mound where it can kill the queen. Don’t be alarmed if you don’t see results right away. Because of boric acid’s low toxicity, the same reason it is effective at killing whole mounds, it may take up to a month to see a reduction in ant numbers. Boric acid bait stations can also be used to prevent ant infestations. There are various strategies for bait station placement depending on the kind of ants and the amount and type of area needing protection. If the ants don’t accept the bait, try diluting it or adding more flavor. For example, ants in strawberry crops are more attracted to bait when strawberry juice is mixed in.

Physical disruption of ant nests provides more immediate results. Using a shovel or piece of rebar to break up the ground around the entrance to the colony forces ants that would be foraging to rebuild. If food supplies are low, the ants inside may eat their young. This allows beneficial insects to get to work without interference. Unfortunately, this is only a temporary solution and mounds will need to be repeatedly disturbed to distract the ants from tending to their honeydew source.

Other control measures you can use are nematodes, orange oil drenches, and sticky barriers. Read our Ant Bulletin and our founder Everett J. Dietrick’s paper Argentine Ants Must Be Suppressed for more information on ant control. This fall we’re also offering discounts on ant control supplies.

On an ant control side note, in a field study where they used only sticky barriers for ant control in an organic citrus grove, researchers found more aphids in the trees without ants! Their conclusion was that, as a side effect of excluding ants, they were also protecting the aphids from earwigs. After analyzing the populations of other aphid predators in their grove, they determined that earwigs are one of the main natural controls of aphids in the springtime. Populations of some of the other predators grew in response to growing aphid populations, but not fast enough to control them without the help from the earwigs.

Discussing the study at Rincon-Vitova, we thought of other predators we see a lot in orchards and gardens that would be blocked by sticky barriers – wolf spiders and ground beetles. Releasing aphid predators to back up the naturally occurring ones might have helped the aphid problem in the study grove. Or maybe another method of reducing ant interference without stopping crawling predators from finding the aphids, such as baiting, would have worked better in their case. Aphids can also be blasted off plants with a strong jet of water, which might be a good strategy if you are using sticky barriers. This study is a reminder of how complex these ecological systems are, and that we have to be alert to the unexpected effects our pest control efforts.

(The study mentioned, “Effects of the concurrent exclusion of ants and earwigs on aphid abundance in an organic citrus grove,” was written by Josep Piñol, Xavier Espadaler, Núria Cañellas and Nicolás Pérez and published in the August 2009 issue of BioControl (vol. 54, no. 4, pp. 515-527).)

-Alia Tsang, Bug Farm intern

Lacewing Marathoners

Lacewing larvae feeding on Aphid (Photo © Rincon Vitova Insectaries, Inc.)

Lacewing larvae feeding on Aphid (Photo © Rincon Vitova Insectaries, Inc.)

An efficient green lacewing larva might consume 350 aphids, 11,200 spider mites or 3,780 scale crawlers! They are good at cleaning up eggs and young larvae of many beetles and caterpillars, mealybugs, whiteflies, thrips, leafhoppers and more without wasting time eating the whole thing. They drink the juice and toss away the exoskeleton terminating the prey before moving on. They compete in endurance as well, walking seven miles as larvae. Launch these hungry long-distance runners in pest hotspots.

To sustain these general predators, first control ants by baiting their runs or turn mounds inside out. Then cultivate habitat for beneficials. Corn stalks and sunflowers when shaken at dusk in the peak of bloom will send lacewing fluttering overhead. Borders of alfalfa and oilseed Brassicas, Beneficial Blend or Insecta-Flora seed mixes support lacewing and other natural enemies.

For more info, check out our Lacewing Bulletin on at rinconvitova.com.

This article originally appeared in our Biocontrol Beat Winter 2008 Newsletter.



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