which life stage of the honey bee is most commonly fed upon by the varroa mite
Varroa destructor The adults suck the "blood" (hemolymph) of adult honey bees for sustenance, leaving open wounds and transmitting diseases and viruses. The compromised adult bees are more prone to infections. With the exception of some resistance in the Russian strains and bees that have Varroa sensitive hygiene (about 10% of colonies naturally have it), the European Apis mellifera bees are almost completely defenseless against these parasites. (Russian honey bees are one-third to one-half less susceptible to mite reproduction).[2]
Africanized bee The Africanized honey bee was first introduced to Brazil in the 1950s in an effort to increase honey production, but in 1957, 26 swarms accidentally escaped quarantine. Since then, the species has spread throughout South America and arrived in North America in 1985. Hives were found in south Texas of the United States in 1990.[1]