Pests and diseases
Fruit and vegetables are often prone to attack by pests and diseases, many of which only attack certain species of vegetable or fruit. Others such as slugs a snails attack most plants, especially in the early seedling stage. There also pernicious weeds which take over a plot if not curtailed.
A comprehensive guide to diseases can be found at www.rhs.org.uk.
Here are a few of the more common allotments problems: