Our study indicates that some plant products (H. lupulus and M. communis) as well as plant-derived compounds capsaicin, nordihydroguaiaretic acid, sanguinarine, thy- moquinone, and trans-2-hexenal have potential to control growth of P. larvae in vitro at applicable concentrations. The use of perspective non-toxic compounds could represent a natural alternative to synthetic antibiotics in the control of American foulbrood, lessening considerably the contro- versies of antibiotic residues and resistance. Because of their significant growth-inhibitory action on P. larvae and their low toxicity to bees, these plant-derived products are potentially useful alternatives in suppressing American foulbrood, while being commercially available. The sub- sequent work will focus on field efficacy, methods of dosage (sugar solution, candy or aerosol) and delivery.
Our study indicates that some plant products (H. lupulus and M. communis) as well as plant-derived compounds capsaicin, nordihydroguaiaretic acid, sanguinarine, thy- moquinone, and trans-2-hexenal have potential to control growth of P. larvae in vitro at applicable concentrations. The use of perspective non-toxic compounds could represent a natural alternative to synthetic antibiotics in the control of American foulbrood, lessening considerably the contro- versies of antibiotic residues and resistance. Because of their significant growth-inhibitory action on P. larvae and their low toxicity to bees, these plant-derived products are potentially useful alternatives in suppressing American foulbrood, while being commercially available. The sub- sequent work will focus on field efficacy, methods of dosage (sugar solution, candy or aerosol) and delivery.
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