By Misssixty
Lancashire,
United Kingdom 
My nasturtions have lots of tiny black caterpillars on, I keep pulling the affected leaves off , have also used a spray, but they insist on remaining !!
Any suggestions would be helpful.
On plant
nasturtions
15 Jun, 2017
Answers
Thanks for your reply Moon Growe, will give it a go , but they seem to be mostly in the new flower buds ,but also under the leaves.
Heres hoping it works.
Thanks.
17 Jun, 2017
Try spray them with a mixture of liquid soap and water. Mind you nasturtiums are as tough as old boots so they usually survive a caterpillar attack without problems.
15 Jun, 2017