How to Get Rid of Cinara Aphids on a Christmas Tree

In the Field

• 1

  Inspect the trees for areas of infestation throughout September and October. Look for purple stains under trees, and inspect branches and needles closely for the aphids. Also, wasps surrounding a tree indicate possible infestation as they are attracted to aphids.

• 2

  Mark infested with flagging tape, so you will know which trees to treat in the winter.

• 3

  Apply the insecticide thoroughly on the infested trees using a high-pressure sprayer at least two weeks before harvest. Wear safety goggles, respirator and gloves when applying insecticide.

• 4

  Inspect trees again during harvest. Look for purple stains on the ground or gloves when harvesting, and watch for aphids that fall out as trees are hauled out.

After Harvest

• 5

  Inspect trees by shaking thoroughly and watching for purple stains while moving them. Isolate problem trees from other trees. Control of cinara aphids on already harvested trees is difficult, so focus on preventing the spread of the aphids to healthy trees.

• 6

  Wash infected trees thoroughly with water and insecticidal soap.

• 7

  Treat the washed tree with insecticide and allow to dry for several days before handling. If you are operating a Christmas tree lot or moving your tree inside your home, treat with a household-safe insecticide and allow to dry.