対象-3: キノコの採集には、細心の注意が必要です。

Excite!&@nifty:
Close attention is necessary for the collection of the mushroom.

Livedoor:
Careful cautions are required for the collection of a mushroom.

Yahoo!:
Scrupulous attention is necessary for the collection of the mushroom.

OCN:
Scrupulous attention is necessary for collection of mushroom.

BabelFish:
Prudent note is necessary in collection of the mushroom.

Google:
The gathering of mushrooms, you must be extremely careful.

Bing Translator:
Collection of mushrooms requires careful attention.

Summary)
"の" for target is correctly handled.