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Each 200g pot of grease is enough to protect 1-2 mature trees (it depends how thick the trunk is) for a year.
Like Greasebands, Fruit Tree Grease is used for two main reasons. The first is to trap a wide variety of winter moths before they can lay their eggs on fruit trees. The wingless females climb fruit trees in early winter from November onwards to lay their eggs near dormant fruit and leaf buds. When these hatch, the caterpillars eat leaves and fruit. A band of fruit tree grease (which is extremely sticky) around the trunk of the tree above grass and weed height either deters or traps them
Fruit tree grease also catches in earwigs in spring and summer and prevent ants from farming and protecting aphids and scale insects.
Full instructions are on every pot of fruit tree grease, but put simply a ring of grease is smeared around the trunk of each tree so that crawling insects are prevented from climbing the tree to lay their eggs. They stick in the grease and die.
You can buy other garden chemicals and fertilisers here.