grape cane gallmaker
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Beginner
Scientific Name
Ampeloglypter sesostris
Identification
Eggs:
- Yellowish-white
- Oval
- 0.6 mm long
- 10 mm long
- Legless
- Yellowish-white colour with a light-brown head and dark mouth parts
- Resembles the adult beetle with legs and snout clearly discernible
- Light-coloured but becomes dark just before it changes to an adult
- 3 mm long
- Distinctive curved snout
- Dark brown snout beetle
- 4 mm long
- distinctive curved snouth
- Gall-like swelling on cane just above nodes
- Galls usually twice as thick as the cane and 2.5 to 4 cm long
- Galls uniform shape except for a deep longitudinal scar or series of holes on the side of the gall where the female made the egg cavity
- Round exit hole near longitudinal scar
- On red varieties, tissue surrounding injury turns reddish-purple
Often Confused With
Grape cane girdler: oviposition scars encircle the shoot instead of running longitudinally
Period of Activity
Galls reach full size when grapes are between pea-size berry and cluster close.
Scouting Notes
When scouting for grape berry moth larvae along borders of vineyards, make note of any shoots with broken ends after wind, and examine the ends for oviposition scars. Cut the shoot longitudinally and look for larvae and/or frass.
Threshold
None; This is a pest of low impact with rare exceptions.
Advanced
Scientific Name
Ampeloglypter sesostris
Identification
Eggs:
- Yellowish-white colour
- Oval
- 0.6 mm long
- 10 mm long
- Legless
- Yellowish-white colour with a light-brown head and dark mouth parts
- Resembles the adult beetle with legs and snout clearly discernible
- Light-coloured but becomes dark just before it changes to an adult
- 3 mm long
- Distinctive curved snout
Damage
- Gall-like swelling on cane just above nodes
- Galls usually twice as thick as the cane and 2.5 to 4 cm long
- Galls uniform shape except for a deep longitudinal scar or series of holes on the side of the gall where the female made the egg cavity,
- Round exit hole near longitudinal scar
- On red varieties, tissue surrounding injury turns reddish-purple
Often Confused With
Grape cane girdler: oviposition scars encircle the shoot instead of running longitudinally
Biology
Grape cane gallmaker overwinters in the adult stage in debris on the ground. Adults can be seen on the shoots in the spring when temperatures exceed 15.5ºC. Egg-laying begins when shoots are from 25 to 50 cm long. The female lays an egg in one of a series of holes she chews along the cane just above a node when canes are 10 to 20 inches long. The cane swells in the area of the oviposition injury. The young larva feeds on tissue surrounding the egg cavity. Later it feeds along the center of the shoot in the pith above or below the gall. The larvae pupate in the galls. Adults begin to emerge from infested canes in mid-summer and emergence continues through September.
Period of Activity
Galls reach full size when grapes are between pea-size berry and cluster close.
Scouting Notes
When scouting for grape berry moth larvae along borders of vineyards, make note of any shoots with broken ends after wind, and examine the ends for oviposition scars. Cut the shoot longitudinally and look for larvae and/or frass.
Threshold
None; This is a pest of low impact with rare exceptions.
Management Notes
Commercial vineyards are not usually damaged severely. No management required.
