![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiB5szyjWcsMXgBS6wu3XEBLYTtA_qfCFn7GUCjS7zxlpJZe_eOgmx8uxEGtNwgmm7Ugg3JcHqlceLTFUqa-ta4uCDRU0AWRDU3yVwwkJohy0DIU2hFXsk6CbmEfnn7E8YqHSLMPLdQMg/s400/whole-leaf-web.jpg)
And here's the bad news as far as the larvae are concerned. This is the primary parasite, a Campodorus sp. Ichneumonid. This is the one that oviposits from under the leaf, curling its long abdomen round the leaf edge. The larvae are currently too small to target, but I suspect egg-laying will commence in a day or two.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifatyjdE21b-HKoRRcgUMJQ07PXMXH1sgV90dYlHiIf9DMNTB8DyZ_Fae2KgZ9hWRKQ79N6NdJtFWH7M03E0WfWULvM27QsxQkSwtk77fdKk_RfUjEEJyKuyeiV1VrKMBqxPKmZQ7b8Q/s280/campodorus-web.jpg)
A very common leaf-miner found on Alder is the Sawfly Fenusa dohrnii. This makes a brown blotch mine that wanders between two veins, heading towards the leaf edge.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEit9Orn9DOni7C2EI1iczLSpEGXDFJGTA7uw-nrJQ9tjc3FqP8ts41zPpJYDScM3orTOylKrxZvEU1WRJHmet_KojB1k90ovD48r8enhfaYWXoEXEguTti8_uKdTSxaOWl0hba4YE3wjQ/s280/fenusa-dohrnii-web.jpg)
This close-up of the larva shows the distinctive shape, with wide 'shoulders', which confirms that we are looking at a sawfly rather than a fly, which has simple bullet-shaped larvae.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhAUooLtv0Sq4XtcN7BlLMyjyDXAX3daCmySniuuII4CRF3xN6eM-Egj5KHKbGDXNSsNY6e-H7uYCxBxII6CnZInizcVYTUgMA7yx5sF8YC-xouy8iSKse3SD5mmQtMCWirp8fH1GGIGQ/s280/fenusa-close-web.jpg)
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