Honeydew is a classification of honey thatBee Collecting Honeydew honey from Oak leaf refers to honey produced by honeybees collecting nectar that is exuded from another insect such as an aphid or scale insect. It is quite common in a number of countries and the best known is honeydew from the Black Forest in Germany. World wide honeydew can be referred to variously as "forest honey", "Pine honey", "Fir honey" etc. and may sometimes be referred to by the specific species of tree producing the honeydew.
Typically honeydews have lower levels of glucose and fructose and higher levels of complex sugars due to the extra enzymatic actions in the sap sucking insect's gut. Honeydews don't normally crystallize due to the reduced levels of glucose and also have a high mineral content which is measured as a high conductivity - this measurement being the main tool to differentiate honeydews in the laboratory.