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I am having trouble with pests eating my Lupin plant, poppy plant and gooseberry plant leaves (I have found out that my problem with the gooseberry could be sawfly larvae)
Can anyone advise me what to do?
Get an insecticide and spray. The ready-to-go bottles are easy to use. You'll need to be quick to tackle the goosegog sawfly.
I agree with Si, don't leave the sawfly long, they can strip the entire foliage in less than a week. Good luck