Webworms on Arizona Roses: Detergent Soil Drench & Orthenex Protocol

40-year rosarian in Buckeye, AZ battling webworms? The spray isn't reaching them inside webs. Two-pronged attack needed.

1. Soil Drench for Pupae/Adults

¼ cup dry detergent (or liquid) + 1 tsp dish soap + 1 gallon water. Soak soil around roses. Forces pests to surface or kills in place.

2. Foliar Spray for Active Caterpillars

Orthene (acephate) — penetrates webs, systemic. Apply late afternoon (they feed at night). Strong chemical — follow label exactly.

Follow-Up Question: Leaf Drop & Soil Safety

Orthene won't burn leaves (formulated for roses). Diluted detergent is mild — test small patch if concerned. Liquid detergent = safer than dry.

Cycle Breaking

Repeat drench + spray at first sign of new webs. Webworms have multiple generations — persistence wins.