Dursban replacement?

[damaged]

Just direct drilling spring oats into old grass ley on heavy clay. Spayed off and limed last winter. Another light dose of roundup a few days ago.
Conditions are good but soil still has plenty of wire worms and leather jackets. Not sure about frit fly.
I never used Dursban when it was available but sods law, I need something now. Any suggestions from the spray gurus?
Oats will be over sown with Rye grass for whole crop.

 

[Will Blackburn]

Too late here, but I did wonder whether Austral seed dressing may partially help?

 

[Simon Chiles]

Too late here, but I did wonder whether Austral seed dressing may partially help?

I'd do this.

 

[damaged]

Yes good plan for next time. Seed was undressed (and left over from previous spring).