S pyri help needed

Hello,

I am pretty sure that the problem you described is not a matter of foodstuff. It seems to me - without knowing any details - that the caterpillars contracted an infectious disease. Thus, as there is no adequate therapy, you should face the fact that all of them may die gradually.

Regards

Hi,

which L are they? Recently hatched from eggs?

If so, they may be thirsty. Spray a little water.

best regards

Thomas