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Treating Rose Slugs on New Knockout Tree Rose

One-Month-Old Tree Rose Under Attack

Lower leaves on a newly planted knockout tree rose are full of small holes, some nearly completely eaten.

Rose Slug Identification and Treatment

This is classic rose slug (sawfly larvae) damage. Any rose insecticide spray for chewing insects will control them.

Critical Application Tip

Spray thoroughly around the base of the tree rose. Rose slugs drop to the soil after feeding, then climb back up to eat again. Treating only the foliage misses half the population.

Roses: Knock Out Rose Tree Planted Outdoors Shows No Growth; Why Tree Roses Die in Winter & How to Protect Them; Tree Rose Failure: When the Rootstock Takes Over; Tree Rose Frost Damage: Assessing Survival and Recovery; Overwintering Knock Out Tree Roses in Cincinnati: Protecting the Bud Union; Saving a Failing Tree Rose: Convert to Rugosa Bush; Winterizing Tree Roses in Zone 5: Bubble Wrap and Garage Storage; Frostbitten Rose Tree: Recovery Protocol; Emergency Repair for a Broken Tree Rose Trunk; Rose Tree Winter Protection in Iowa Zone 5: Trunk Insulation Method

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Overwintering Tree Roses in Cold Climates: Garage vs. Trench Method

Overwintering Knock Out Roses in Raised Planters: Mulch and Fertilizer Timing

First-Year Winter Protection for Knock Out Roses in Indiana: Simple Soil Mounding

Planting a Double-Grafted Rose Tree: Why the Bud Union Is So High

Pruning an Overgrown 10-Foot Rose Bush/Tree in Stages

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Removing the Dead Top from a Double-Decker Tree Rose