Cabbage seed weevil

[Laggard]

Didn’t spray last year’s OSR with any insecticide. Unfortunately there was a lot of damage from brassica pod midge. Haven’t used any insecticide on this year’s OSR either but wondering if I should spray for cabbage seed weevil this year?

 

[DrWazzock]

I never found the spray had any effect one way or the other. I think it came down to timing it right, which was impossible as egg laying was over a protracted period so the one shot knock down spray was practically useless, unless you make a living selling it.

 

[Brisel]

The seed weevil makes a hole in the pod that the bladder pod midge uses to lay its eggs. This is worth reading:

The status and potential of parasitoids of seed weevil and pod midge on winter oilseed rape | AHDB

ahdb.org.uk

 

[Laggard]

The seed weevil makes a hole in the pod that the bladder pod midge uses to lay its eggs. This is worth reading:

The status and potential of parasitoids of seed weevil and pod midge on winter oilseed rape | AHDB

ahdb.org.uk

Doesn’t seem spraying is the answer. Disappointed to see so much damage last year. Does any scientific institution measure numbers of seed weevil each year?

 

[Brisel]

NIAB?

 

[Laggard]

Anybody including an insecticide in their OSR flowering spray this week?

 

[Gong Farmer]

Anybody including an insecticide in their OSR flowering spray this week?

Ask yourself, should those two words be in the same sentence?

Impossible to monitor as you'd have to walk through the whole crop, not just get an idea from headlands. And when anything approaches (person, tractor) they drop to the ground. Also, pod midge don't need the weevil to make holes, they can make their own.

 

[Brisel]

No insecticide planned. A quick look at the radiator grille on the sprayer tells the story and by then it’s another pass if the screen is really covered. Little point in nuking the pollinators.

 

[Laggard]

 

[Brisel]

There are the reasons not to add an insecticide! Pollen beetles will pollinate your crop. The ladybird will eat a lot of aphids. I can only see a few seed weevils.

 

[Laggard]

There are the reasons not to add an insecticide! Pollen beetles will pollinate your crop. The ladybird will eat a lot of aphids. I can only see a few seed weevils.

Just sprayed fungicide. Second year of growing OSR with NO insecticides.

 

[farmerm]

Reviving an old topic...

Novice OSR producer.. I am looking at 3-4 cabbage stem weevils per plant.. treat or leave and if treat when?


EDIT: I mean seed weevil....!

 

[Laggard]

What are you going to treat it with?

 

[Brisel]

Reviving an old topic...

Novice OSR producer.. I am looking at 3-4 cabbage stem weevils per plant.. treat or leave and if treat when?

There is nothing you can treat them with.

 

[farmerm]

There is nothing you can treat them with.

What are you going to treat it with?

Rec for

https://www.adama.com/uk/en/our-solutions/insecticides/mavrik

my thought was it would do more harm than good

 

[Brisel]

Rec for

https://www.adama.com/uk/en/our-solutions/insecticides/mavrik

my thought was it would do more harm than good

You typed stem weevil (pre edit), not seed weevil. Which is it? Seed weevil can be controlled. Stem weevil cannot.

 

[farmerm]

You typed stem weevil, not seed weevil. Which is it? Seed weevil can be controlled. Stem weevil cannot.

Blood crop has too many pests Seed weevil

 

[Brisel]

Blood crop has too many pests Seed weevil

Sad but true!

3-4 seed weevils per plant in the crop away from the headland? If so, I will check but it sounds like you are above the threshold for treatment. Mavrik is arguably the least harmful to beneficials I.e. pollinators. Never mix pyrethoids like Mavrik with triazoles as they disable the repellency for bees.

Usually, the flowering fungicide is when the sprayer engine radiator grille is covered with them, by which time it would mean another pass through the crop causing more damage, so I don't bother

 

[Brisel]

Control of cabbage seed weevil on oilseed rape | AHDB

Find out how to identify and control weevils to prevent direct and indirect yield losses.

ahdb.org.uk

 

[farmerm]

Control of cabbage seed weevil on oilseed rape | AHDB

Find out how to identify and control weevils to prevent direct and indirect yield losses.

ahdb.org.uk

Neighbours independent says spraying them is a waste of time