Who has sprayed for flea beetle?

[Tractor Boy]

Your main problem is that Cabbage Stem Flea Beetle is pretty much resistant to pyrethroids.

Why are you guys out spraying pyrethroids ? It ain't going to control your flea beetle !

Cabbage stem flea beetle and flea beetle are different species!

 

[snarling bee]

Interestingly the rate of Karis (lambda C) is 50ml for CSFB and 75ml for flea beetle. Obviously all my damage is caused by the Wessex Flea Beetle.

 

[snarling bee]

Your main problem is that Cabbage Stem Flea Beetle is pretty much resistant to pyrethroids.

Why are you guys out spraying pyrethroids ? It ain't going to control your flea beetle !

In Germany they have resistance but not in the UK ... yet. Pollen beetles are a different matter though.

 

[Farmer Dod]

Sprayed some for flea beetle and now we're starting to be attacked by slugs. The joys of growing oilseed rape.

 

[Feldspar]

Have done the whole lot now. Looked at the odd patch in a nearby field which we aborted drilling and there's barely any rape to be seen. Just the odd stalk which has been stripped completely by flea beetle.

 

[Centre]

Your main problem is that Cabbage Stem Flea Beetle is pretty much resistant to pyrethroids.

Why are you guys out spraying pyrethroids ? It ain't going to control your flea beetle !

Good advice David, what do you suggest we do with a crop that is going backward quickly?

 

[Brisel]

Your main problem is that Cabbage Stem Flea Beetle is pretty much resistant to pyrethroids.

Why are you guys out spraying pyrethroids ? It ain't going to control your flea beetle !

You are thinking of pollen beetle. Knock down resistance is coming, but isn't widepsread in the UK yet.

 

[Hindsight]

http://www.farmersguardian.com/arab...und-in-cabbage-stem-flea-beetle/66684.article

http://www.hgca.com/press/2014/june/24/growers-asked-to-take-part-in-resistant-beetle-survey.aspx

Edit - just deleted the link to sample form as I had forgotten it was for beetles found at harvest not now in growing crop. Other links still relevant.

 

[dontknowanything]

A

 

[david]

You are thinking of pollen beetle. Knock down resistance is coming, but isn't widepsread in the UK yet.

But surely going out this autumn with 2 or 3 rounds of pyrethroid is only going to increase the selection pressure for resistance.

I understand that Biscaya (a neo-nic) is going to get approval on OSR for flea beetle.

 

[FFC]

Finding plants at night like this. Been sprayed twice already!

 

[Brisel]

But surely going out this autumn with 2 or 3 rounds of pyrethroid is only going to increase the selection pressure for resistance.

I understand that Biscaya (a neo-nic) is going to get approval on OSR for flea beetle.

Nothing that I would argue with there. I did use the word "yet." I merely took umbrage at a sweeping statement.

 

[yellow belly]

I have used black seed for the last 10 years not sprayed for csfb since the 1990s
so far no signs around here the volenteers in this harvests field seem to be free may be hss is resistant

 

[david]

Nothing that I would argue with there. I did use the word "yet." I merely took umbrage at a sweeping statement.

My experience this year in veg crops is that flea beetle are pretty much resistant to pyrethroids, we had a real battle with them in June and July. None of the pyrethroid materials provided any knockdown effect of flea beetle. You spray them today, and when you come back tomorrow, the little blighters are still there munching away at your crop. No corpses on the soil, which you should expect to find if pyrethriods were doing a job.

We are lucky in veg that we have other materials which have 'in-direct' effects on flea beetle - Chlorpyrifos, Indoxacarb, Thiaclopyrid, so when we go into control aphid or caterpillars these materials do a job on flea beetle. 'In-direct' - I mean 'not officially stated on the product label that they control flea beetle', but then we are going into the veg to control aphid or caterpillars.

I guess with OSR you got to do something, its not cheap to grow, and flea beetle are eating the hell out of it - look at FFC's picture above ! But is the current regime of spraying pyrethroids just a case, 'well I went and sprayed it, surely it must do something ?'

The chemical supplier isn't going to refuse your order for pyrethriod - are they ? But how many of them have the balls to actually question what they are seeing in the field ? What is their attitude ? - the first spray didn't work, so lets fire some more at it !

Just my observations, but I wish you OSR growers lots of luck.

 

[Hampton]

But surely going out this autumn with 2 or 3 rounds of pyrethroid is only going to increase the selection pressure for resistance.

I understand that Biscaya (a neo-nic) is going to get approval on OSR for flea beetle.

Ridiculously, biscaya (thiacloprid) is a neo-nic!! But obviously spraying it is far less damaging than using other neo-nicks as a seed treatment!? Good logic EU!!

 

[Brisel]

Biscaya has about 10% of the toxicity to bees that clothianidin or thiamexoam has which is why it is still approved for foliar application.

 

[Hampton]

Biscaya has about 10% of the toxicity to bees that clothianidin or thiamexoam has which is why it is still approved for foliar application.

Now you are applying science to a political debate! You can't do that! You will be telling me that badgers have a link to Btb in a minute! Hang on...

 

[Feldspar]

Heard of the first lot of rape being pulled up and redrilled around here due to flea beetle.

 

[bert]

Drilled our first 94acre straight off the heap on the 19th of august and got its first spay today, all looks well with none badly damaged, made a good seedbed and got plenty of moisture and was up and away. at what stage is it big enough to be safe from the beetle?

 

[franklin]

Expect to be spraying some herbicide on the rape this week and adding insecticide in even if I dont see any insects. Dressing was always an insurance - now I am getting that out of a 1lt can. And everyone I have asked is doing the same around these parts.