Any chance of pictures?

the photos are here !
have not found any black bug later on.
i disposed off the ones which were there.
though found these.

link for the photos > http://picasaweb.google.com/109078447128567897634/ImagesWhatAreThese#

Here is a link that might be useful: http://picasaweb.google.com

They look like wireworms and I wouldn't call them white.

Here is a link that might be useful: Wireworm control

Small whiteish, orangeish, grayish, wiggly thingys in soils are the larva of one of a number of, usually not large problem, insects such as Fungus Gnats. Most often the potting soils will have the eggs the produce these larva and when the right mixture of soil moisture and temperature are found these eggs hatch and slowly pupate into the adults.
The simplest means of control of these soil borne larva is to allow the potting soil to dry out (near the surface) between waterings since the major reason the eggs hatch is because the soil is kept too wet.

To me they look like millipedes. If so, they're scavengers and commonly found in high organic soils and places. No remedy needed.

Seriously doubt they're wireworms. Wireworms are bright shiny golden yellow, and have only 3 pair of quite small legs.