What Is This Larvae On My Delphinium Leaves?

Question

Over the past few weeks I have noticed my delphinium leaves (I have 5 plants) turning brown and black, curling and falling off, as well as some of the flower buds. I have removed the dead and sick leaves and buds and flowers (which have finished for now anyway). There is new growth at the base of each plant that looks healthy. I had a good look today and found these brown larvae underneath one of the leaves (see photos). What is it? What can I do? Should I cut back each plant – how far down?

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Answer 1

I am unable to identify that type of larva. I have never seen those, here, in my area. I would try a general purpose pesticide. Most organic methods are broad spectrum and will treat a large number of insect pests.

Here are some articles that will help:

https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm

https://www.gardeningknowhow.com/plant-problems/pests/pesticides

https://www.gardeningknowhow.com/ornamental/flowers/delphinium/growing-delphinium-plants.htm