Pre-emergents are used as weed killer for grass.Most people use weed killer for bermuda grass to prevent the germination of crabgrass.Killing weeds are easy with lawn pre-emergents.
Generally, pre-emergents are applied in spring and fall.
Hot temperatures are naturally perfect for crabgrass seeds to germinate.Normally, people assume as soon as temperature start to hit 50-55 degrees fahrenheit, it is ideal to put on pre-emergents for spring.We recommend as soon as temperatures hit 51 degrees you should put down granular pre-emergents.
Are we done fighting the weeds finally?
Not yet.There is a slight problem.Many of us follow calendars,let's say in your region temperatures generally hits 50 degrees on march 1.These data are generally based on past oriented informations.But mother nature has her own rule.There are chances of warm fronts to move in.
Pre-emergents normally lasts from 2-6 months.So it’s better to put down your granulars two or three weeks before the temperature starts to rise.
TIP- To get the best results, it’s wise to put down some pre-emergents(liquid sprays) again after 3-4 weeks after the granular applications.By doing so, you can remain stress free for the rest of the year regarding pre-emergents.
Below is just a screenshot of a great tool which allows you to know about soil temperatures depending on dates and location.You just need to enter your location and change dates to know when soil temperatures start to get closer to 51 degrees.Based on that put down pre-emergents 2-3 weeks before that actual date.
Click on the image below to go to the website.Follow the data on the left to get idea about average past temp.
(We have shown temperatures based on california.Change it according to your specific location)
Moreover, the graph below shows a probable date for germination of crabgrass seeds. You can also put down pre-emergents 2-3 weeks before the actual date shown below:
You don’t need to worry about crabgrass in the late fall into winter, rather you would want to target Poa Annua and other winter weeds. However, you would also want to make sure your pre-emergent has been able to put a stop to the crabgrass when applying depending on your zone.
If you have new sod in your lawn, it’s wise not to apply pre-emergent as temperatures are going to drop and grass will go dormant.
Otherwise, apply a light amount of granular pre-emergent as you have sometime for winter to come.As soon as winter hits and you bermuda grass goes dormant, apply heavy(following limits) liquid pre-emergents.
Moreover, you could apply humics to your lawn as much as you can.The more humic you apply, the more healthy is your soil.
With bermuda grass pre-emergent herbicides, it’s crucial to treat your entire lawn area. Missing a spot may become a chance for weeds to come out again.
Most pre-emergents require watering in, even the liquid ones are applied using a hose-end sprayer. With liquid herbicides, the volume of water that is used to disperse the weed killer is not sufficient to help the soil absorb the material.As it cannot reach the weed seeds, it may not work efficiently.
That’s why you should apply water after pre-emergent application on bermuda grass.Else, apply before rain if it’s in the forecast.
To make it easy for you, we have selected some best pre-emergent(both granular and liquid) for your bermuda lawn. below:
Note- Read the labels carefully. Find which weeds treatment are mentioned on them.
To make it easy for you, we have featured some best pre-emergent for bermuda grass here!