Various pests may cause problems when propagating, but as they attack a wide range of host plants they need only be considered in a general way so that the gardener can recognize them and treat them appropriately.
When infested propagating material, or a plant, is placed in a propagating environment, the increased levels of temperature and humidity often cause a population explosion.
It is important, therefore, to propagate, ) whenever possible, from material that appears to be free of pests. It is safer, and often ' easier, to control pests on stock plants before I taking cuttings rather than to treat the cuttings later before they have established
> themselves as plants. This is not always possible, however, and routine pest control measures should always be taken in the
I propagating area to combat invasions of f pests from infected plants elsewhere in the ) greenhouse or garden.
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