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The adult sawflies are winged insects 5-7mm long, with yellow bodies with black markings and black heads. The caterpillars have pale green bodies with black spots, and black heads and about 20mm long.
Plants are severely defoliated as a result of the caterpillars feeding. Often the older leaves will have the veins remaining on the older leaves as these parts are too tough for the caterpillars mouthparts to deal with.
Now you know what the problem is, and the damage it is doing, don't let your plant suffer.
For specific problems try one of our specialists...
Lalbagh Botanical Garden
Bangalore, India
Saint Petersburg Botanical Garden
Saint Petersburg, Russia
Royal Botanic Gardens, Kew
Richmond, United Kingdom
The New York Botanical Garden
New York, United States
Eram Garden
Shiraz, Iran
Butchart Gardens
British Columbia, Canada