When to stop spraying due to heat

[woody 1]

As title says, do you stop because of bright sun shine or when it gets too hot ?
Reason for asking, today isn’t that hot (21 degrees) but unbroken bright sunshine and tomorrow will be very hot and sunny, just wondering what people’s thoughts are.

 

[silverfox]

I’d do it early morning or late evening . I wouldn’t risk it in bright sunshine

 

[teslacoils]

Tricky. I'm just about to finish for the day. Cloudy. 18 degrees. Best chance before the thunder though.

 

[JMM]

I was always told to avoid spraying in direct sun if the temperature is 20c or above, thats direct sun mind you, i've sprayed in temperatures up to 24c with it overcast with no ill effects.

 

[average farmer]

I think it’s risk vs reward, not done any today . Plants stressed enough without me putting them under more for the sake of 2 hundred weight/ acre with chemicals and pass costing 1 , if it was below 20 and dull I’d have been doing a bit . Enjoy the football to

 

[Zippy768]

Finished T3's around 12:30pm. Might had been 20°c by then. Only a bit of teb, and if I leave it too long, i might as well not bother.

Planning on some spring beans tomorrow morning. Hoping for earlier start as dont have to do nursery run. Hopefully done by 10am.

In 2019 I went spraying t1s on ww through the day and it must had been 24/25°c with clear skies. 2x fung, 1x herb, 2x pgr. Absolutely no after effects .
2019

 

[Wombat]

21 is my cut off

 

[Nick.]

I asked my agronomist today, he was too worried about the temp alone. (Only a bit of fungicide )
He was concerned about how bright it was plus the temps.
But then it’s a trade off to beat any rain v scorch.

 

[principal skinner]

Today looks like last chance for T3 before the weather breaks, so will be going all day I think

 

[Phil P]

Past week I’ve just been starting at 5am as it’s cooler but mainly because through the day it’s been getting too windy. Went spraying beet at half 9 last night as thay really don’t like been sprayed when it’s hot! Past year though I’ve found you have to go early or late on to avoid all the walkers!

 

[7800]

There’s really no problem doing ear wash up to 25 degrees in sunshine.
herbicides on other crops a different matter

 

[Bman]

It pays some time not think too much and just crack on. rather have my ear wash complete before this bad weather than my crop exposed

 

[Wombat]

It pays some time not think too much and just crack on. rather have my ear wash complete before this bad weather than my crop exposed

No such rush as it’s not started flowering here yet

 

[principal skinner]

It pays some time not think too much and just crack on. rather have my ear wash complete before this bad weather than my crop exposed

This totally, On T3’s all day yesterday and finished at ten pm, damp here all day today with an unsettled forecast glad I’ve done it.

 

[Farmer Roy]

Err, you know, a lot of the major arable & cereal growing regions around the world are a lot hotter & drier than the UK


just saying . . .

 

[teslacoils]

Clear skies and heat are so rare. We both desire and fear them in equal measure.

 

[Chae1]

Err, you know, a lot of the major arable & cereal growing regions around the world are a lot hotter & drier than the UK


just saying . . .

I didn't used to spray in the heat of the day in Australia either.

Got up early did a load. Went back to bed started again late afternoon and kept going through evening.

Just saying...

 

[teslacoils]

Tbh our national sport is "complaining about the weather". The mummies at the school gate who were wearing three jumpers and whining about the winter are now wearing huge hats, looking flustered, and complaining about the heat. That's a five degree range. I say bring on the mid 30s. Bloody love it.

 

[Farmer Roy]

I didn't used to spray in the heat of the day in Australia either.

Got up early did a load. Went back to bed started again late afternoon and kept going through evening.

Just saying...

So do we during summer, but our summer temps are a lot higher than 20 C

 

[Strungup52]

Canada, we stop spraying most chems @26C.
But, spraying glufosinate (Liberty) on Canola we like to go above 24C to about 30C for best results. Today much cooler and stopped around noon, the temp had dropped to 18C, weird.