Parasitic Mite Syndrome, Deformed Wing Virus and Bee Paralysis are caused by the varroa mite.
Parasitic Mite Syndrome [PMS]
Symptoms of PMS are spotty brood pattern with sunken, dark, torn and chewed cells. Melted, discolored larvae and lack of eggs are signs of affected brood.
Deformed Wing Virus [DWV]
Adult bees with DWV are quite obvious as their wings do not form properly and appear chewed up, although they are not. They have a greasy appearance, may be hairless, trembling, and show aggressive behavior. Affected bees cannot fly.
Chronic Bee Paralysis Virus [CBPV]
Chronic Bee Paralysis Virus [CBPV] is another effect of high mite loads. It is highly contagious in adult bees. Developing bees seem to have lower viral loads. Symptoms are weak, shaky wings, hair loss, and a greasy, black appearance. Some bees may exhibit no symptoms, yet spread the virus & die within days. Transmission of the virus is through bee feces and through close contact with one another. This is why it’s so important to sanitize hive tools between inspections.
Often times these symptoms of high varroa infestations lead to colony collapse. To stop virus spread, the mite issue has to be addressed. Tests such as sugar roll and alcohol wash help determine mite load. A sample is taken from a frame that has uncapped brood. If the queen is healthy and it’s early enough in the season, the colony may be saved. Strong colonies are a beekeepers best bet. We treat with organic compounds throughout the year; not just in spring, summer, temperature permitting.