Maximizing Control of White Grub and Other Insects in 2022

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Now is the time to plan your preventative white grub programs to maximize control. Here’s how:

  • A game-changing grub control solution from EnvuTetrino® is an insecticide that shows excellent control of all white grub species in research trials and real-world use last season. Tetrino also shows excellent activity against other important pests including annual bluegrass weevil, caterpillar pests like sod webworm, cutworms and fall armyworms, plus chinch bugs
  • Timing is everything – regardless of what product you use, best practice is to start applications for grubs when you see the first adult beetles in flight (usually early-July to mid-August). Systemic products like Tetrino and Merit® have a long soil residual under “typical” environmental conditions
  • Apply the right rate
    • A full rate of Tetrino (32 oz/acre) is recommended to ensure season-long grub control. This can be applied as a single application during peak adult flight (mid-June through mid-August), or as a split application (16 oz/acre + 16 oz/acre) in late spring and again in mid-late summer to target a wider range of pests throughout the season
    • With imidacloprid, it is critical the full label rate (0.4 lbs ai/A per year) is applied regardless of formulation. Be careful with some combination Merit/fertilizer products because their high label rate equates to less than 0.4 lbs ai/A. Here are the proper rates:
      • Merit 75WSP = 5 x 1.6 oz packet/A per year
      • Merit 0.5 G = 80 lbs/A per year
      • Merit 2F = 1.6 pt/A per year
      • 0.2% Merit on Fert = 200 lbs/A per year
  • Water it in
    • For Merit, irrigation or rainfall (≥ 0.5 inch) should occur within 24 hours after application to move the active ingredient targeting grubs through the thatch into the soil profile (where the grubs are feeding)
    • For Tetrino, irrigation or rainfall (0.125-0.25 inch) should occur within 24 hours after application
      • If targeting surface feeding insects like caterpillars, post application irrigation is not required
  • Minimize thatch – thatch layers > 0.5 inch can severely limit insecticide movement to the area of grub feeding
  • Other insects problematic – Tetrino’s flexibility allows for multiple applications at a variety of rates depending on the insects that are most important:

Timing and rate of Tetrino® based on primary insect pests, exact timing depends on local conditions

Timing White grubs Billbugs + white grubs (+ spring caterpillars or black turfgrass Aetaneuis [BTA) ABW + white grubs (+ spring and fall caterpillars or BTA)
 May    16 fl oz/A  32 fl oz/A
 July  32 fl oz/A  16 fl oz/A 32 fl oz/A


  • Need more info? - Read and follow the product label, and contact your Envu area sales manager if you need assistance

White grub control is largely weather dependent, so optimizing management strategy is critical 

White grub control is largely weather dependent, so optimizing management strategy is critical. (Envu)

Rob Golembiewski

by Rob Golembiewski , Ph.D., Green Solutions Team Specialist

Sunday, May 1, 2022