When plants cry for help ,predator bugs answer

The topic of this is all about plants wanting help. They have a very clever method.The method is when caterpillars start nibbling on wild tobacco plants,they give a "help us" with their saliva cues. This is interesting because i learned the sign in plants when they want help.This took place in Jena,Germany in 27th August.I found this interesting because it was a very different method of wanting help and that is why I wrote about this.