Lithium chloride treatments in free flying honey bee colonies: efficacy, brood survival, and within-colony distribution

The efficacy of various lithium chloride (LiCl) applications in eradicating the parasitic mite Varroa destructor in honey bee colonies was investigated, with a specific focus on its impact on brood development. In broodless colonies (3 weeks post queen caging), the highest efficacy of 98% was achieved with a 9-day treatment of 2.5 kg of candy spiked with 50 mM LiCl. A shorter 5-day treatment with 2 kg of 50 mM LiCl candy resulted in an efficacy of 78%. In colonies with brood, a repeated short-term application of 4 × 0.5 kg 50 mM LiCl candy yielded an efficacy of 88%. LiCl treatment led to a removal of the first batch of brood reared after release of the queen. However, no long-term effects on colony growth were observed, and the colonies successfully overwintered. Additionally, the study demonstrated that lithium is rapidly distributed among the bees of a colony within 2 days, yet only low concentrations were detected in stored food samples. This suggests that the bees efficiently absorb and distribute lithium within the colony. The harvested honey in the following spring revealed a lithium concentration of 0.1-0.2 mg/kg, which is below naturally occurring lithium levels in honey. Based on these findings, LiCl can be considered an effective and easy-to-apply acaricide in broodless colonies, and even in colonies with brood, it had good efficacy and no long-term effects on colony survival. Further research may be necessary to determine the optimal treatment period for achieving an efficacy over 95%.

 

Comments:

That's an intriguing study! It seems like the use of lithium chloride (LiCl) presents promising results in combating Varroa destructor in honey bee colonies, especially in broodless colonies. The efficacy rates achieved in the study are quite impressive, particularly the 98% efficacy with a 9-day treatment of 2.5 kg of candy spiked with 50 mM LiCl in broodless colonies.

The fact that the treatment didn't exhibit long-term negative effects on colony growth or survival, despite the removal of the first batch of brood after queen release, is encouraging. It's also interesting that the bees efficiently distributed the lithium within the colony, with low concentrations found in stored food samples and harvested honey.

The potential for LiCl as an effective and easily applicable acaricide in honey bee colonies, even in those with brood, is significant. However, the study also highlights the need for further research to optimize treatment periods to consistently achieve over 95% efficacy.

This kind of research is crucial for sustainable beekeeping practices, ensuring the health and survival of honey bee colonies while effectively managing pests like Varroa destructor.

Related Products

Cat.No.	Product Name	Information
E0153	Lithium Chloride	Lithium Chloride (LiCl) inhibits the replication of type 1 and type 2 Herpes simplex virus at concentrations which permitted host cell replication. Lithium chloride also prevents glucocorticoid-induced osteonecrosis of femoral heads and strengthens mesenchymal stem cell activity in rats.

Related Targets

Antiviral