An alternate collective noun for 'dust' is a layer of dust.
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A collective noun is an informal part of language. Any noun that suits the situation can function as a collective noun. In the noun phrase 'a chest of cutlery', the noun 'chest' is functioning as a collective noun. The standard collective noun is 'a set of cutlery'.
A spot of leopards would work. Collective nouns are not set in concrete; any noun suitable for the context can be used as a collective noun. A noun is not inherently a collective noun; a noun is determined to be a collective noun by its use in grouping people or things. The standard collective nouns for leopards are a leap of leopards (also spelled 'leep' or 'lepe') and a keep of leopards.
There is no specified collective noun for trees in a road; you might use an obstruction of trees, a hazard of trees, or a suitable noun of your choice.
The collective noun 'cache' is used for:a cache of ammunitiona cache of jewelsa cache of moneya cache of weapons
The noun 'man' in the collective sense is race or human race. The noun 'man' as an individual doesn't use a collective because the word is singular. A collective noun is used for a group of something.