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The appearance of globe thistle (Echinops) foliage can be spoiled by the larvae of a fly that feeds within the leaves.
Echinops leaf miner is a small fly which develops as larvae that feed within the foliage of wild and cultivated globe thistle (Echinops) plants.
The adult flies are ash grey and about 2mm long. They feed by rasping the leaf surface, causing many small pale spots on the upper leaf surface. More significant damage is caused by the creamy white larvae. They eat the internal tissues of the leaves and cause whitish brown discoloured blotches. The mines typically have a pale edge around the darker brownish centre.
There are probably at least two generations during the summer and by August leaves can be affected by several mines.
Echinops plants will survive and produce flowers, even when there is extensive leaf mining, so control measures are not essential.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
Echinops leaf miner has at least two generations during the summer. The females deposit their eggs on the foliage during April and July. The eggs hatch into legless larvae that tunnel into the foliage where they eat the internal tissues. The mines are linear forming silvery lines throughout the leaf, lines of black excrement (frass) are often visible within these mines. When fully fed, the larvae pupate within the mines.
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