Why potted Carnivorous Plants are so liable to disease ? Grey mould (Botrytis),  greenfly (aphids) and cochineal are the most common trouble to fight. In the Wild we've never seen grey mould killing carnivorous plants, why?  Sun, wind and rain help plants to fight mould. Rain, especially, plays an essential role dissolving store of mould, the sun it dries up  and wind disperses the residue. In cultivation the situation is quite different: if grey mould attacks a plant  you can try to move pots in an airy room but sometimes It isn't enough so may be necessary to apply harmful chemical products.

Also greenfly and cochineal rarely attack bog plants in the Wild, this is probably due to the wrong environment for these parasites. At home they can choose which plant may be a good lunch  moving from plant to plant.

Also peat moss plays an important game. As we know, only high quality  peat moss can be used for growing CPs. This is very important because CPs lives where soil acidity is very high (low pH); on the other hand soil acidity allows peat to keep long itself. As long as soil acidity is pH=4.5-5 or lower, it won't be problem with plants. When soil acidity rises over pH=5.5 or more,  means it's time to change the substrate.

But  why peat changes acidity and why it is so harmful for Carnivorous Plants? As we remember the main characteristic of most of  CPs is to live in areas poor of  Nitrogen, absence of this important element induced plants to get it  in other ways becoming carnivorous and letting to the root system the function to absorb water and other mineral salts.  This is the reason why a Carnivorous Plant may die if ferilized, roots are so weak to burn if contaminated with Nitrogen.
 

  1st Important Rule : NITROGEN =    ( for CP of course!!)
 

When a vegetable substance is going to rot, his biological structure is assailed by two kinds of bacteria: aerobic and anaerobic. The below simplified diagram shows decomposition of a vegetable :
 

                       / Aerobic Bacteria    =  Oxidization =  H2O + CO2
 Dead Plant +
                       \ Anaerobic Bacteria =  Reduction   = NH3 + Nitric Compound + Sulphurous Compounds
 
 

  2nd Important Rule:  ANAEROBIC BACTERIA -> Reduction -> Nitrogenous Compounds = DEATH OF PLANTS
 
 

At high acidity levels ( pH< 5) anaerobic bacteria action slow down, damaging substances can't be produced and Carnivorous Plants may survive. This is the main reason to keep pH soil  as lower as possible. On the other hand water should be soft  to avoid lime build up that helps pH rising triggering a negative chain reaction.

Is it possible to avoid storing of  Nitrogen traces in the soil? Yes, in  Basic guidelines  section, there is a very simple and working trick to avoid it.

Water stagnation. Watering  by tray is a method to keep wet potted plants,  but there is an hidden mistake: water used for damping peat moss, is never shook and when aerobic bacteria have exhausted all oxygen dissolved into water, anaerobic bacteria begin their work with the above effects. A common fact is Sphagnum death when cultivated in pot. Sphagnum is  a very amazing plant if kept live, but it requires care: very clean water, light, night cool and so. If  Sphagnum  is put in a water tray, after a few days (it depends from temperature), if  removed  from  water  it is possible to smell stink as rotten eggs on the  previously submerged  parts.  This is hydrogen sulphurated produced by anaerobic bacteria, a real poison for  plants. A solution for solving  this problem is described in  Basic guidelines page.