Can I tank mix Grub+ and Tea Saponin?
Can you apply tea saponin liquid and Grub+ as one mix as noticed small mounds of soil in the lawns mostly the back lawn.
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Small mounds of soil pushed up through the surface are worm casts, not grub activity. They're different problems, and Grub+ is the wrong product for this one.
@Iain Perry thanks Iain please advise which is the best product to use?
@Paul Reilly Tea Sap for worm. Grub+ doesn't touch worms.
The tank mix answer depends on which pest you're targeting with the Grub+.
If it's going down for soil-dwelling pests (grass grubs, black beetle larvae, porina), Grub+ needs to be watered in straight after application to move the active down into the root zone. Tea Saponin also needs watering in (8 to 15mm). Both products want the same post application treatment, so a tank mix works fine from that angle. Jar test first to confirm compatibility, but there's nothing obviously problematic about the two chemistries together.
If you're targeting surface feeding caterpillars (sod webworm, armyworm), Grub+ needs to stay on the leaf. You hold off irrigation for 24 hours so the active remains where the pest is feeding. Tea Saponin does the opposite: it needs to be watered in to reach the worms. Those two requirements conflict, so don't tank mix them for that application. Apply them separately.