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United States

My lawn company applied granular prodiamine as a pre-emergent herbicide. They arrived unannounced (WTF), so I was unable to rope off my growing area. Thankfully, I haven't planted yet. Since prodiamine appears to work by stopping germination, could I start the pumpkin in a pot, and transplant it without any negative effects from prodiamine?

4/15/2023 8:11:46 PM

Syracuse, NY

I took this on as though it were my own problem and did not see anywhere a reference to pumpkins - at least not directly.

I am hoping others chime in for you but here's the label I saw just for reference and my takeaway from the huge listings was
"* DO NOT use on food producing trees, vines, or plants.
** Not for use on container grown plants.
***Landscape ornamentals only"
...just for reference to what you might be dealing with, like 'YIKES!'

SO, even if it doesn't bother the pumpkin seedlings after a certain number of leaves have developed, DON'T eat anything that has been exposed to this herbicide - I dunno what happens if someone does
and I sure wish I coulda helped more---eg

http://newsomseed.com/resources/Prodiamine65WDG_LABEL.pdf

4/15/2023 10:11:24 PM

Menomonie, WI (mail@gr8pumpkin.net)

It appears they also use it as a pre-emergent on some crops such as soybeans, alfalfa, and ornamental crops. It is almost like Preen (trifluralin). Just like Preen you may prohibit your secondary root growth.

4/16/2023 8:39:35 AM

Syracuse, NY

It's Sunday, so don't mind my preaching:

Call the manufacturer + lawn company, in that order, before you chance toxifying
yourself amidst all these warnings on this highly-readable label.

I did not see nor find with a search of the page (Control + F) + then the first three and four letters
(soy)beans nor (alf)alfa NOR (pump)kins - Sorry.

"4. Disturbing the herbicide barrier with cultural practices such as disking may result in reduced weed control."

"Before planting a species not listed on this label, it is recommended that several test strips
of an indicator plant such as wheat, sorghum, or corn be sown into the treated area. If the
indicator plants germinate and grow normally to a height of 12 inches with normal root
development, it is safe to plant."

SO - Here now, you could direct-seed several AGs and see how they do WHILE you are
sprouting for real otherwise indoors;

I actually sprouted test 443s of mine and alternatingly put them in the refrigerator, literally on a random
basis - A day or two in there, a day or two out of there and they lived to a ripe, young age
before termination after INITIALLY acting like they were wilting SLIGHTLY, butt bounced back,
so, seedlings can be slowed like that and not even become leggy, for such a purpose.

'What's good for the Goose is good for the Gander...'
...we've yet to hear from the Gander on that....

Not only those recs butt since it was granular AND if it has NOT rained since application,
you may be able to de-sod the area, but only after seeking and heeding any advice of the
M'f'r. (lol)

(See the last ten lines of the label)

...and the lawn company.

Good Luck! eg

4/16/2023 10:33:52 AM

Torrance, Ca.

What Engel said. I've heard this from other growers over the years.
I was thinking about trying it a few years back and they changed my mind.

4/16/2023 12:49:44 PM

United States

To be clear, no one will be consuming this pumpkin. It's purely a hobby to see how big I can grow.

Also, it has rained since they applied the granular prodiamine.

4/16/2023 9:17:39 PM

Eugene,OR

If you have a neighbor you don’t like, give him/her a bunch of blossoms from it & tell them that they are delicious. You’ll either find out they are not too toxic, or you’ll have one less irritating neighbor.

4/16/2023 9:30:56 PM

Bethlehem CT

It could definitely be a lot worse. Like if they had put down a bunch of broad leaf weed killer. I know many pumpkin farms that use preemergents in there pumpkins to keep the weeds down. Like Shannon says it is in the same class of herbicide as Preen which is labeled for garden vegetables. SO I would expect it to be about the same. I am not aware of any grower trying out preemergents now or in the past on there giants. So we don't know. As far as I know we have all been to afraid to try them. In my opinion, You may not have any major issues.

4/17/2023 10:18:28 PM