Runescape 3 Halloween Event of task

The first task
You will get an empty Ghost Buster 500 with 50 rounds of white destabiliser and five lots of other, variously colored destabilisers to clear up his ghost infestation.
These toys cannot attack you. To rid a toy of its possessor, simply load the Ghost Buster 500 with the white destabiliser. This is the liquid that will reveal the ghost’s true identity, and must be used first before the colored destabiliser.
When the color of the ghost has been revealed – it will be blue, red, yellow, black or green – then load the Ghost Buster 500 with the correct color destabiliser and dismiss the ghost. This process should continue for each of the ghosts in the workshop, and you need to dismiss three of each ghost type.
The destabiliser will be destroyed if you put it here, and you will have to get another from Diango when it is gone.

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The second task
Diango also has a problem of a rather imposing tree that has started to grow through his factory floor. The tree has the unfortunate habit of swallowing those who get too close or try to pull out its roots, so Diango understandably wants this pest out of his workshop. This hulking creature may seem to be an imposing foe, but once you get to the root of the problem then it should not be an issue.
You should be able to twig how to defeat the tree once you have tried to pull out its root. The tree will drag you down through the soil and underneath the workshop, where the roots of the evil tree dangle menacingly. With the use of a Woodcutting axe, these roots can be chopped down, sapping his energy.
Once ten of these evil roots have been collected, return to Diango via the column of roots in the centre of this underground area and receive your final Halloween item!

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Rewards
You will be rewarded with a black Halloween mask, two red, green and blue Halloween masks, two pumpkins and all the other Halloween special event items.
If you lose any of your untradeable Halloween items, visit Diango and he will return them to you.