The practice of modern agriculture
is typically considered as unstable. In landscapes occupied by crops, we
usually observe only one plant species taking over a huge amount of land.
Cereals, fruits and vegetables are cultivated worldwide almost exclusively in
monocrops. Under these conditions, pest and diseases outbreaks are more frequent and losses are unavoidable, if control methods were not applied. Pests
may reproduce faster, and after crop harvest, these insects, mites and fungi
spores, may spread and infect adjacent areas.
Synthetic broadspectrum
pesticides are usually used, eliminating possible natural enemies. Simple
substitution of inputs (for example, replacement of soluble synthetic chemical fertilization and pesticides by high doses of organic fertilizers and green pesticides) is not a suitable solution. In general, green pesticides or
biological control agents demands more time to be effective against pests.