- Common name: Teaweed
- Scientific name: Sida spinosa
- Grass or broadleaf: Summer annual broadleaf
- Native to the eastern two-thirds of the United States and prevalent across the South
- One of the most troublesome weeds in peanuts, cotton and soybeans in the Southern states1
- Emerges as temperatures warm in early spring, continuing through September, and can grow to 3 feet in height
- Can produce approximately 1,000 seeds in a single weed
- Can reduce yield potential by as much as 10 percent2
A fact that may surprise you
- The common name of prickly sida is teaweed because the weed’s leaves look a lot like the leaves of a tea plant.
Fast facts from David Hillger, Enlist™ field specialist, Dow AgroSciences
To correctly identify prickly sida when scouting, look for the following plant-distinguishing features:
- The seedling’s cotyledons are heart-shaped and covered with small hairs.
- Leaves are small, ¾ to 2 inches long, oval-shaped with toothed margins and are alternately positioned on branched stems.
- Prickly sida flowers are pale yellow with five petals.
- Stems have small, blunt spines at the leaf and branch bases.
- A member of the mallow family, prickly sida is related to velvetleaf and cotton.
- According to TakeActionOnWeeds.com, herbicide-resistant prickly sida has been documented in Georgia.
- Since the early 1990s, prickly sida has shown resistance to ALS inhibitors (Group 2).
*Resistance confirmation does not necessarily include all weeds and may vary among different areas of each state.
Prickly sida control/management tips:
- Plant soybeans early in narrow rows with high seeding rates.
- Apply a preplant burndown followed by a soil-applied preemergence herbicide.
- Use a postemergence herbicide treatment to control prickly sida before they get too large for adequate control.
- Prickly sida experiences increased germination during high temperatures.
General tips to manage herbicide-resistant weeds
Growers in the Midwest and Midsouth face some of the most difficult-to-control weed species. Taking the following steps during the season can help manage weed resistance issues:
- Develop an integrated weed management plan that delivers multiple modes of action throughout the season. With resistance increasing, the Enlist™ weed control system allows growers to use multiple postemergence modes of action, including glufosinate, glyphosate and a new 2,4-D in soybeans and FOPs, glyphosate and a new 2,4-D in corn.
- Use full rates of herbicides during applications. Do not use partial rates or trim back for any reason, including cost.
- Spray when weeds are small. Although it can be challenging because of weather and other factors, this is the ideal application timing.
- Scout fields regularly to identify weeds when they are small and easy to control.
Dow AgroSciences weed control solutions:
SureStart® II herbicide
Keystone® NXT herbicide
Keystone® LA NXT herbicide
FulTime® NXT herbicide
Surpass® NXT herbicide
Durango® DMA® herbicide
Enlist Duo® herbicide, as part of the Enlist™ weed control system
More information can be found online at:
Prickly Sida (Teaweed) Management in Soybeans — United Soybean Board