Rose Weevils

Facts, Identification, & Control

Latin Name

Merhynchites bicolor 

Appearance

What Do They Look Like?

Rose Weevil

Rose Weevil image licensed under CC

  • Body: The rose weevil measures less than 5 to 6 mm in length with a pronounced snout.
  • Color: They are red and black in color.

How Did I Get Rose Weevils?

Rose weevils make their homes in nearby gardens. They burrow holes into flowers to feed on, especially roses.

How Serious Are Rose Weevils?

Rose weevils are harmless and do not bite people or pets, but they can be frustrating for gardeners. Despite their small size, these pests are serious threats to all horticulturists.

Agricultural Damage
A rose weevil’s snout can drill through flower buds and will cause irreparable harm to petals. These weevils lay their eggs inside flowers before they bloom that may eventually destroy the entire plant.

Signs of Rose Weevil Infestation

The appearance of open infected flowers with petals riddled with holes are sure signs of infestation.

How Do I Get Rid of Rose Weevils?

What You Can Do
In order to control rose weevil populations, it is necessary to identify them immediately. Noting which rose varieties appear most attractive to these weevils will assist for proper identification. Discarding adult specimens and infested buds may help prevent the reappearance of their populations the next year.

Pesticides should only be used if other methods fail and should not be applied without first consulting a specialist in ornamental plant pest control.

What Orkin Does
Your local Orkin technician is trained to help manage rose weevils and similar pests. Since every infestation is different, your Orkin technician will design a unique program for your situation.

Orkin can provide the right solution to keep rose weevils in their place and out of your yard, home, or business.


Behavior, Diet, & Habits

What Do They Eat?
Using its long snout, adult rose weevils puncture rosebuds in order to feed, while larvae the plant’s reproductive parts for sustenance.

These pests feed primarily on roses and prefer light-colored varieties. In the absence of flower buds, adults will feed on shoots or stems.

Life Cycle

Stages
Rose weevils complete their life cycle in four stages:

  1. Egg: Females deposit their eggs on the buds of roses in which she has bored a hole.
  2. Larval: Larvae will feed on the bud until time to pupate. The feeding of larvae often result in the bud falling from the plant.
  3. Pupal: The larvae crawl into the soil to pupate.
  4. Adult: The rose weevil pupates and matures beginning in April or May and can only produce one generation a year.

Geographical Range
While not a common pest, these weevils can live throughout a large portion of the U.S. due to their ability to overwinter in cold regions of the country.

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