Because of the increase of organic farming and consequently lower needs for the usage chemical plant protection products (PPP), biological control agents are becoming more and more important for suppressing agricultural pests. One of the alternatives are entomopathogenic fungus, which cause diseases and death of insects. That feature have fungi of 90 genus. The most studied is genus Metarhizium Sorokin, that belong to the order Hypocreales. They are found in the rhizosphere, surrounding the roots. Fungus is made out of hyphae, that spread into mycelium and cause diseases in insects. The special ability of entomopathogenic fungus is that they infect through the host cuticle and not trough digestive system, like all the other pathogens. As a consequence, entomopathogenic fungus can infect larger number of hosts, such as adult insect, pupa and larva. The crucial question is, if the biological control agents will ever replace the chemical PPP? Fungus are alive organisms, so they are strongly affected by biotic and abiotic circumstances. Also their slow efficiency and higher asking price than chemical PPP, furthermore decrease the interest on the market. However, it is necessary to take into account the benefits of using safety, higher environmental acceptability and a less likely development of resistance to harmful organisms. With their usage we can avoid traces from chemical PPP on the fruit, vegetable and other crops and increase activity of other natural enemies.
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