I have just come to the end of my supply of Phostrogen slow release
systemic insecticide pins and went to get some more. It seems Phostrogen
no longer supply them. Is there an alternative in the plant pin style?

I used then in my hanging baskets to give a season long protection from
thrips, greenfly, whitefly, blackfly, ... and they worked very well in
that I never had any problem with livestock.

Is there anything else on the market in the slow release-type category
which would work as well as these plant pins?

TIA
Margaret Parker