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Leafminer control
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The Pest | |
Adult female leafminers feed on sap by probing the upper surface of leaves. Obvious white spots soon appear where probing has occurred. Eggs are laid at some of these sites which hatch after about a week. The larvae tunnel within the leaf causing typical mines.
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Biological Controls | | » DACSURE (si) Dacnusa sibirica (10% Diglyphus) in units of 250
» DIGSURE (i) Diglyphus isaea in units of 250
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| | Dacsure (si)
Dacnusa adults are dark brown-black and 2-3mm long with long antennae. The females lay their eggs in the larvae of leafminers and are able to locate mines at very low densities. The larvae develop within the leafminer larvae at a rate which allows the leafminer to reach pupation. At this point the leafminer are killed and adult Dacnusa emerge. Dacnusa adults live for about 10-14 days and during this time will lay 60-90 eggs. Directions for Use
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| | Digsure (i)
Diglyphus adults are black and 2-3mm long. They lay their eggs beside the leafminer larva which they have paralysed. The Diglyphus larvae feed on the leafminer eventually killing them. Characteristic black columns are made in the mines where the Diglyphus pupates. These remain after the adults emerge and are a clear sign that Diglyphus was present. Diglyphus is particularly active in the summer, and because it kills many leafminer larvae at an early stage, it is more effective than Dacnusa at controlling large populations. Dacnusa performs well in the absence of prolonged periods of intense light, providing control during winter but we have found that Diglyphus will also establish successfully in winter providing it has sufficient host available. Directions for Use
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