Glyphosate

Oat

Member
Location
Cheshire
It depends how wet the leaf is. If there is enough water on the leaf, that the spray creates enough liquid to cause run off, the it's a problem, but if not then it will actually improve the coverage of the glyphosate on the leaf. I was sprayed a contact herbicide on some rape which then got a light shower of rain (not enough to cause run off). It obviously improved chemical coverage, as the bit I sprayed the the day before had much worse control.

If the chemical dries on the leaf, then it gives more time for the chemical to be absorbed. This is also why it works better when the plants are actively growing, they will absorb the chemical and translocate it around the plant quicker. If temps are going below freezing and you think that the chemical won't dry on the leaf, then I would leave it.
 

Sonoftheheir

Member
Arable Farmer
Location
West Suffolk
Thanks, I haven't sprayed glyphosate this early before so that's why I'm asking such basic questions!
I knew there was something about spraying damp/wet leaves, different plants also shed the water better than others.

I'm not too keen on how cold it is, but it's nice and dry travelling and very little wind here for a change. Couple of nice sunny days here forecast too.
 

Brisel

Member
Arable Farmer
Location
Midlands
It depends how wet the leaf is. If there is enough water on the leaf, that the spray creates enough liquid to cause run off, the it's a problem, but if not then it will actually improve the coverage of the glyphosate on the leaf. I was sprayed a contact herbicide on some rape which then got a light shower of rain (not enough to cause run off). It obviously improved chemical coverage, as the bit I sprayed the the day before had much worse control.

If the chemical dries on the leaf, then it gives more time for the chemical to be absorbed. This is also why it works better when the plants are actively growing, they will absorb the chemical and translocate it around the plant quicker. If temps are going below freezing and you think that the chemical won't dry on the leaf, then I would leave it.

This. (y)

It will take longer to translocate around the plant at this time of year, so any perennial weeds should be left for at least a week before any cultivations.
 

Sonoftheheir

Member
Arable Farmer
Location
West Suffolk
This. (y)

It will take longer to translocate around the plant at this time of year, so any perennial weeds should be left for at least a week before any cultivations.

Thanks, we won't be planting for another month or so. Really wanted everything to be well dead by the time we get planting.
 

JCfarmer

Member
Mixed Farmer
Location
warks
Sprayed our stubbles off on afternoon Monday, reasonably warm and sunny with 3l Azural, 0.6l Spryte, 125l of water. Will be left a week at least before ploughing for spuds.
 

Sonoftheheir

Member
Arable Farmer
Location
West Suffolk
100 be fine, amistar slightly courser, depends how much one leaf BG there is really. I normally use guardian air 03's for my Glypho, might push it to 125l/ha if I want better coverage.

I just thought at 100 LHa I'd have to travel too fast for ploughed ground? Would probably only be able to manage 10 kph so the pressure would be very low on the sprayer?
 

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