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Lesson Nine

Biological Pest Control 9-6


Leaf Miners

Leaf Miners are a major problem for many crops. The larvae form
tunnels in the leaves of the plant. This may lead to desiccation and
early leaf loss. The loss of chlorophyll may result in severe reduc-
tions in yields.

Damage by Leaf Miners

Leaf Miner

Leaf Miner adults are small black and yellow flies. Leaf Miners eggs are inserted in leaves
and larvae feed between leaf surfaces, creat-
ing a meandering track or "mine." At high
population levels, entire leaves may be cov-
ered with these tracks. Mature larvae leave
the tracks, dropping to the ground to pupate.
This life cycle takes only 2 weeks in warm

 Biological Control

Dacnusa sibirica and Diglyphus isaea

These parasitic wasps lay their eggs in or near leaf miner larvae. The young parasite larvae
hatch from these eggs and begin to feed on their host, internally if Dacnusa and externally 
if Diglyphus. Eventually a new parasite adult emerges to continue the work of its predecessors.

Dacnusa sibirica

Diglyphus isaea