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At the end off a cycle, especially when buds are big, sometimes they start to rot. It is best to take harvest out right away because otherwise it will spread quite fast. Bud rot can be more or less prevented by keeping the relative humidity low.

24.2 Stem rot

When making clones, sometimes plants get a little brownish where it is put in the medium. After this, leaves will hang down, stem will get soft and plant will eventually die. This is caused by a fungus. Normal root stimulators will not help preventing this problem, special medication is needed.

24.3 Spider mites

When leaves get little yellow dots and when in a later stages webs are formed around buds and leaves, you got a plague of the most feared enemy of all growers and destroyer of harvests, SPIDER MITES. When yellow dots are visible, take a leave of and look at the back. In case spider mites are there, little 1 millimetre black dots are visible that will walk away when pushed. It is easy to get them when buying new clones, or when your plantation is close to an outside garden. But it is very difficult to get rid of them. The plague can sometimes be more or less controlled by using the natural enemy of spider mites, PREDATORY MITES. In some countries it is also possible to get an insecticide that will kill all mites. But be aware, this insecticide should be only for spider mites, if the label is saying it will work on all kind of pests, it will not kill all mites.

24.4 Trips

When leaves have little yellow spots, bigger than spots produced by spider mites, and leaves also have silver coloured trails on them, trips is there. Normally trips will not destroy a whole harvest, like spider mites will do, but in time they will do some damage. When there is a problem it will be enough to spray plants with a broad working insecticide that can be bought in any flower / plant shop.

24.5 Whitefly

Management of whiteflies is difficult. Insecticide applications often fail to provide adequate control and whiteflies are able to rapidly increase in numbers when conditions are ideal. The greenhouse whitefly has developed resistance to certain insecticides. The important role of natural enemies in reducing populations of greenhouse whitefly is clear. Releases of the parasitic wasp, Encarsia formosa, have been successful in controlling greenhouse whitefly and are widely used in Europe.