Shrubs, trees & patio plants · Austin, Texas
Root drench treatment in Austin
Root drenching at a glance
| Pests it’s for | Aphids, mealybugs, scale (including crape myrtle bark scale), whiteflies and ash borers |
|---|---|
| Plants | Landscape shrubs, hedges, crape myrtles, small trees and big patio pots |
| How it works | Applied to the soil at the base of the plant, taken up by the roots, carried through the sap |
| When to treat | Spring as new growth starts, ahead of bloom; again in fall if needed |
| What we don’t drench | Vegetable gardens, fruit you’re about to pick, milkweed, plants in full bloom |
| Price | Quoted by the number and size of plants before any work. Plus tax. |
| Contract | None |
What a root drench is, and why it beats spraying for these pests
Aphids, mealybugs, scale and whiteflies all feed the same way. They push a mouthpart into the plant and drink the sap. A spray only kills what it lands on, and these insects are good at hiding. Mealybugs tuck into leaf joints and under bark. Scale sit under a waxy cover. Whiteflies live on the underside of the leaves and lift off in a cloud when the sprayer gets close.
A root drench works from the inside. The tech mixes a systemic product with water and pours it into the soil around the base of the plant, close to the trunk where the feeder roots are. Over the next days the roots take it up and the plant moves it through the sap into the stems and leaves. Any insect that feeds on that sap takes in the product, wherever it’s hiding on the plant.
Because nothing goes on the leaves, there’s no spray drifting onto the patio, the pool or the neighbor’s car. That matters on tight South Austin and Mueller lots, where a hedge sits two feet from the next driveway.
Austin plants we drench most
| Plant | Usual pest | What you’ll notice |
|---|---|---|
| Crape myrtles | Crape myrtle bark scale, aphids | White crust on the trunk and branches, black sooty mold, sticky cars parked underneath |
| Gardenias and hibiscus | Whiteflies, mealybugs | A white cloud when you brush the plant, yellowing leaves, white cotton in the leaf joints |
| Hollies, ligustrum and euonymus | Scale, whiteflies | Bumps along the stems, leaves dropping, black film on the hedge |
| Roses | Aphids | Clusters on new buds and tips, curled new growth |
| Potted citrus and big patio plants | Mealybugs, scale | White fluff on stems and sometimes on the roots, sticky leaves |
| Ash trees | Redheaded ash borer | Sawdust and small holes in the bark, branches dying back |
Black film on the car or sticky patio furniture is usually the first sign. Not sure which pest it is? Text a close-up of the leaves and stems and a wide shot of the plant to 512-203-0525. The office can usually tell from the photo.
How we drench a plant
- Confirm the pest. We make sure it’s a sap feeder. Sooty mold alone isn’t the problem, it grows on the honeydew the insects leave behind.
- Check the soil. The drench has to soak in, not run off. Bone-dry soil gets a light watering first.
- Measure by size. The amount is based on the size of the shrub or the trunk of the tree, poured evenly around the base.
- Treat the plants that need it. Only the affected plants and the ones touching them, not the whole bed, which leaves lady beetles and lacewings elsewhere alone.
What you can do
- Water the bed normally the day before the visit if it’s been dry
- Hold off on heavy nitrogen fertilizer on these shrubs; soft new growth draws aphids
- Wash sooty mold off with a hose once the insects are gone
- Tell us if the plant is in a pot, a raised bed or a rock bed
How long it takes to work
A drench isn’t instant. The plant has to pull the product up from the roots before the insects feed on it. On shrubs and patio pots you’ll usually see the population drop within one to two weeks. Larger plants and trees take longer, sometimes several weeks, because the product has farther to travel.
Don’t judge scale by whether it falls off. Dead scale stay stuck to the bark and leaves until weather and time wear them away. Look for new growth that stays clean, honeydew that stops dripping and no new crawlers in spring. One spring drench usually carries a crape myrtle or holly through the season. For aphids, if the colony is still going strong at about three weeks, call and we’ll take a look.
When to drench in Central Texas
Timing matters more with a drench than with a spray. The plant moves the product fastest when it’s actively growing, so spring is the main window in Austin, roughly late February through April as leaves come out. Fall, once the summer heat breaks, is a second window for plants that got hit again over the summer.
Bees work crape myrtle flowers hard in June and July, and systemic products can move into the flowers. So we don’t drench plants in full bloom, we never drench milkweed that monarch caterpillars feed on, and we don’t treat vegetable gardens or fruit that’s close to harvest. If a plant is blooming when you call, we’ll schedule it for after the flowers are done.
Where you live changes the job, too. West of MoPac and out toward Lakeway, Bee Cave and Dripping Springs, shrubs often sit in a few inches of soil over limestone, so the tech works the drench in closer to the stem where the roots actually are. In the heavy black clay east of I-35 in Pflugerville, Manor and Hutto, water soaks in slowly, so it goes on more gradually to keep it from running off.
Plants in pots and plants indoors
Big potted plants on a patio or porch, like citrus, hibiscus, gardenias and large succulents, drench well because the product stays in the pot with the roots. Mealybugs sometimes live on the roots of potted plants, and a drench reaches those too.
We rarely come inside just to drench one small houseplant. For one or two indoor plants, wiping the bugs off with rubbing alcohol on a cotton swab or repotting in fresh soil is usually faster and cheaper than a service call.
What’s quoted and what’s covered
Root drenching is its own service and isn’t part of the quarterly pest plan or its warranty. The price depends on how many plants we’re treating and how big they are, and we explain it before any work starts. There’s no contract. If you’re already a quarterly customer, mention it at your next visit and the tech can look at the plants during the visit.
If ants are running up and down the shrub, they’re farming the aphids or scale for honeydew. Quarterly customers should tell the tech so the ant trail gets treated along with the drench.