Posted: 09/05/2015 at 08:23
Try using a spray of diluted Neem oil ... it is totally organic.
See this link for further info.
and this one for how to make it.
I make up a spray of neem oil and as soon as growth starts in April I drench the foliage. Any spare solution goes onto the soil below the plant as the earthworms are supposed to love it. I repeat spray every few of weeks.
Neem is best used preventatively ... but should help with your current attack.
It is totally organic and although it stinks a bit is easy to mix up and apply.
I got mine off ebay .... wasn't expensive for a big bottle which will last ages. At room temperature it is solid, but goes liquid again within a couple of hours in the airing cupboard.
Worth a try.