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This leaflet is produced by the Ministry of Agriculture & Livestock, Solomon Islands, with support
from IPPSI: Improved Plant Protection in Solomon Islands, a project financed by ACIAR, the
Australian Centre for International Agricultural Research, Canberra. Authors: Helen Tsatsia, MAL &
Grahame Jackson, TerraCircle Inc.
Farmer Fact Sheet 28:
Sweet Potato Leaf Folder
What is it?
It is an insect that feeds on the leaves of sweet potato. It also feeds on wild relatives of
sweet potato, as well as Mikania. The scientific name is Herpetogramma.
What damage does it do?
Caterpillars do the damage. They fold the leaves with webbing. The young
caterpillars eat the surface of the leaf; older ones eat through the leaf making small
windows. There is no information about leaf damage affecting yield.
How do I identify it?
Look for folded leaves, unfold them and look for caterpillars, webbing and their
droppings. Look at the leaf surface for small windows between the veins. The adult
moth is brown with zigzag markings on the wings (see photo).
How do I manage the leaf folder?
Tiny wasps provide natural control of the leaf folder. Earwigs and other predators are
also important for natural control. Pesticides are rarely needed.
Cultural control:
DO NOT take vines for replanting from plants with folded leaves.
Chemical control:
• Use plant-derived pesticides, for example, pyrethrum or derris, as they are natural
insecticides and do not last long in the environment; or
• Use insecticides made from bacteria, for example: Spinosad, also known as
Success; or Bt - Bacillus thuringiensis kurstaki.