Ask a Question
Notify Me On Question Update
Email this Question
I think I have Johnsongrass invading my back lawn. I has sprayed the usual Crabgrass/lawn grassy weed killer on it and it is still taking over my entire lawn. What can I do?
Rate This FAQ
Here is a link to Johnson grass control from University of Missouri Extension. The excerpt below on control emphasizes an integrated approach, that is using many different methods to manage the Johnson grass, there is not a silver bullet but an integrated pest management approach to deal with this weed.
link to the article is http://extension.missouri.edu/publications/DisplayPub.aspx?P=g4872
Preventing johnsongrass from becoming established in new areas is the best available control method, because the weed spreads in so many ways. Because johnsongrass is a perennial weed, single cultural control measures or herbicide applications rarely provide adequate control.
Johnsongrass control programs should
* Prevent spread of rhizomes from infested to uninfested areas.
* Kill or weaken established plants and their underground rhizome system.
* Control seedlings originating from shattered seed.
* Prevent production of seed and its spread to new areas.
* Use fall tillage to bring rhizomes to soil surface, where they may be killed by winter conditions.
These objectives are closely related and are equally important to the success or failure of a control program. In limited infestations, it is possible and desirable to use herbicides to kill the weed and prevent seed production. The critical time to kill johnsongrass is while the weed is becoming established and before it has spread over the entire field. For sites with established infestations, a fall application of Roundup or Touchdown will kill emerged tissue and often developing rhizomes.
Submit Your Suggestion
Other Questions In This Topic
- We tilled our garden and planted peas and lettuce about three weeks ago. Nothing has come up yet. We were talking to our neighbor yesterday, and he told us that about 30-40 years ago, in a fit of vexation, the former owner spread an industrial strength soil sterilizing chemical on the area in which we planted our garden. He further explained that weeds have only started to grow in that area in the past 5-10 years. This information has caused my wife to give up on trying to cultivate this area. Should we give up? What can we do to amend the soil in this area?
- I live in East Murray, West Holaday, Salt Lake County. We have a large pine tree and want to plant some flowers under/near it. The plants would be along a fence that runs to the east of the tree. Some, very little west sun in the evening. Any suggestions? I would love some long lasting flowers.
- We moved into our 2-story home in Lehi 1 year ago. The tree out front (which I planned to have my husband cut donw) has doubled in height since then. I don't know what kind of tree it is...medium size, darkish leaves. How do we (and when should we) cut it down to prevent it from sending up suckers?
- Why do we rake leaves? What would happen to my lawn and flower garden if I just left them on the ground and let the grass and perennials grow up through them? We currently mulch them with a mower and let most of them stay. Are we raising the elevation of our lawn? Are we doing good or bad to it?
- How do I keep lady bugs out of my house? Also, how do I keep out Asian Beetles?
- I have a stand of Gambel Oaks in my yard, I would like to leave the oaks, but fill in about 12 inches deep to level the area out. Will this damage the oaks? Is there any recommended ground cover to place in the area?
- I just ordered some blueberry bushes and wondered where I need to plant them in my garden.
- In the past you've offered a lawn-problem analysis --- as I recall a sample was brought in to your office and a quick analysis was done --- is the program still active? What is the schedule?