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Honey producers in the United States and in some European countries have reported a massive mortality of domestic bees for several years (see report): https://www.fundacionunam.org.mx/salud/un-dulce-aliado- the-honey-of-bee /).
The researchers called this phenomenon collapsed colony disorder.
The cause of this problem has been sought and everything indicates that it has several factors causing the massive death of bees.
A study published in 2013 in the Suppliers of the National Academy of Sciences of the United States of America, describes the mechanism through which insecticides can alter the immune response of insects and promote the replication of viral pathogens, being one of the causes of this collapse in the bee hives. The disorder of the collapsed colony causes the sudden and unexplained death of the bees.
The first records of hive deaths are reported in 2006 and 2007, when beekeepers in the United States found the hives completely empty, a phenomenon that was also reported in countries in Europe and Asia.
The fact that the hives collapse has led to various hypotheses to explain the phenomenon, these range from the use of mobile phones to the introduction of transgenic crops.
Until now they have been discarded hypotheses and the effect that pests, diseases, environmental and economic factors, as well as the use of pesticides may have, is being investigated.
One of the possible causes seems to be related to an ectoparasitic mite called Varroa destructor.
The original host was the Asian honeybee, but when Apis melífera was introduced in Asia, the mite found a new host, being found in all beekeeping regions of the world except Australia, where no cases of hive collapse have been reported.
This ectoparasite does not cause the direct death of bees, but it inoculates various viruses that can affect them.
Scientists have found other factors that can affect hives, such as climate change, the stress of transport to farmland, malnutrition due to loss of crop diversity and the use of pesticides.
Nowadays, solutions are being sought to control V. Destroyer, since it is resistant to most acaricides. In addition, it seeks to control the other factors that could contribute to the disorder of the collapsed colony.
The European Commission, for example, limited the use of neonicotinoid pesticides for a period of two years.
Pesticide-free agriculture is also promoted, diversifying the fields of cultivation. Much of our diet depends on the pollination service of these insects. If we do not act in a timely manner, we could face a huge global crisis.