Sacbrood virus

Sacbrood virus or SBV disease is an infectious disease caused by the Morator aetatulas virus that affects honey bee larvae. When sick, the colony declines gradually with little or no replacement troops, costing 20-80% of honey production.[1]

Sacbrood virus
Virus classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Pisuviricota
Class: Pisoniviricetes
Order: Picornavirales
Family: Iflaviridae
Genus: Iflavirus
Species:
Sacbrood virus

Reasons

SBV is caused by the M. aetatulas virus.[2] Transmission is due to bees taking care of larvae, other bees entering the colony to steal, bees entering the wrong nest through a source of flowers, or through beekeepers' activities (changing bridges, importing herds, etc). The disease spreads and flares up when the operation of importing bee breeds is not controlled.

According to Borchert, when studying the disease in 1966, one diseased larva could infect 3,000 healthy larvae. Bailey in 1981 claimed that the liquid in a killed larva containing 1 mg of virus can infect all worker larvae of 1,000 healthy bees.[3]

Symptoms

When sick bees go to work, particularly heavy herds noticed that bees take dead larvae out of the nest. The screw cap on the pupil surface is sunken, and a few small pinholes are present. The larvae die at the new stage screw cap (pupa). At the pointed tip of the diseased larva protruding between the nest holes, the tip of the larvae tilts towards the abdomen. At the larvae's end is a small transparent water bag. Dead larvae have no odor.

Prevention and treatment

The best preventative measures are hygiene of means, transporting tools and beekeeping tools when trading, importing, and transporting bees and products, as well as inspecting and interacting with bees; when importing the breeds, choose healthy, clean and clear herds.

Antibiotics do not affect this disease. Biological techniques such as replacing the sick lord with a royal cap or silk thread, confining the herd for 8-10 days, removing bridges so that the bees thicken the remaining bridges, feeding 5-6 nights in a row to transfer to a new and better source of flowers and isolation from other bee farms and merging the weakening herd.[4]

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References
  1. "Mulberry - Honey bee curriculum. Page 161" (PDF). Archived (PDF) from the original on 2017-02-08. Retrieved 2019-12-05.
  2. "Sacbrood Virus | Texas Apiary Inspection Service (TAIS)". txbeeinspection.tamu.edu. Retrieved 2020-01-03.
  3. "Why is a bagworm (Sacbrood) harmful to bees? Can this disease be cured? Treatment?". Archived from the original on 2017-02-08. Retrieved 2019-12-05.
  4. "Bee bag larvae". Archived from the original on 2017-02-25. Retrieved 2019-12-05.
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