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Plantwise Technical Factsheet

garlic borer (Dyspessa ulula)

Host plants / species affected
Allium ampeloprasum (wild leek)
Allium cepa (onion)
Allium flavum (yellow garlic)
Allium sativum (garlic)
Allium spp.
Allium vineale (crow garlic)
List of symptoms/signs
Vegetative organs  -  internal feeding
Vegetative organs  -  internal rotting or discoloration
Vegetative organs  -  surface lesions or discoloration
Symptoms
The symptoms are revealed during storage, when the larvae are developing within the heads of Allium sativum (garlic). Some outer layers of affected garlic heads have a yellow-brownish colouring, these may be easily crushed because the internal cloves have been devoured. Garlic heads with signs of brownish dry rot, may be totally or partially tunnelled and show larva defecation residues.
Prevention and control

Usually, the selection and removal of infected garlic heads in storage is sufficient. In storerooms fumigants are usually applied to avoid damages during the drying process. The garlic containers may be treated chemically before transport.

Impact
D. ulula may cause up to 10% loss of Allium sativum (garlic) crop. However, the main economic consideration in an infested crop is the cost of rejecting the attacked heads and applying a fumigation treatment to the remaining crop.
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