• Online Events For Landscapers!
    With GIE+EXPO cancelled, virtual education and product launches are filling up the fall. Check out dates for Caterpillar, Exmark, NALP, and more. Click here to learn more.

MONITOR GROWING DEGREE DAY FOR WEED EMERGENCE

ant

LawnSite Silver Member
Location
dirty jersey
ITS COMMON TO HERE A PESTICIDE APPLICATION CO. TO USE GROWING DEGREE DAY MODAL FOR INSECT ACTIVITY BUT DID ANY ONE EVER LOOK INTO OR DID A STUDY ON THE GROWING DEGREE DAY ON WEED EMERGENCE?<br>ANTHONY N.J.
 

thelawnguy

LawnSite Silver Member
Location
Central CT
Our local Lesco posts soil temps from several area locations daily so we can see how much longer we can put off the preemergent apps(!).<p>Here it varies widely, whether your in the valley or the hill country. Degree day averages are taken from one central location so you would have to record your own model at your shop for a truly accurate count.<p>Bill<p>Bill<p>----------<br>&quot;...half my brain tied behind my back, just to make it fair.&quot; R.L.<br>
 

GroundKprs

LawnSite Bronze Member
Location
South Bend, IN
Growing degree days is an interesting overall predictor, but hardly functional in real life. I have seen microclimate insect activity 4-5 weeks ahead of degree day model based on local weather service data. Would only be useful if you set up a digital recording thermometer in exact area you know to expect a problem.<p>Also, on preemergent predictions, numerous university studies over last 6-8 years have shown that mid-October application in northern states is just as effective for next spring as the spring application. Since microbal activity breaks down the pre-ems, and it is not active in winter, you really have a 6 month window of application.<p>----------<br>Jim<br>North central Indiana
 

jborchers

LawnSite Member
Location
Grand Rapids
In my expierence, I can get the best weed control by just watering and mowing right. I have asked customers who can do this allow me to NOT put a pre-emergent down. The results have been great, and I am applying less pesticide into the enviroment.
 

Let-it-mow!

LawnSite Member
Location
North East
Other factors such as sunlight intensity, rain and humidity play a role also. GDD is an interesting idea but not always accurate.
 
Top