Evaluation of low humidity treatments to control Acarus farris (Acari: Acaridae) in Cabrales cheese |
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Authors: | Ismael Sánchez-Ramos Pedro Castañera |
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Institution: | Departamento de Biología de Plantas, CSIC, CIB, Ramiro de Maezt 9, Madrid 28040, Spain. ismael@inia.es |
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Abstract: | Laboratory experiments were conducted to establish the best combination of relative humidity (r.h.) and time of exposure to
be applied on Cabrales cheeses infested with Acarus farris. Laboratory assays revealed that less than 30 h were required to obtain 90% mortality of mites at 50% and 60% r.h. Males
were more susceptible than females to low relative humidity, since their lethal period values (LP) were lower than those obtained
for females at the same relative humidity. Moreover, the response within sexes to low moisture treatments changed as exposure
time increased, since the LP50 obtained for each sex at 50 and 60% r.h. were statistically different whereas the LP90 showed
no significant differences within sexes. Accordingly, two modifications of the traditional maturing process were established
to assess the efficacy of low moisture treatments to control A. farris on infested cheeses. The first modification consisted of one single exposure of 48 h at 50% r.h. and the second one consisted
of two exposures of 48 h at 50% r.h. separated by a time interval of 15 days. No significant differences in final population
density were observed for both low moisture treatments compared to control cheeses. Therefore, low humidity treatments are
not effective to control A. farris in Cabrales cheese, despite the good results obtained in laboratory assays. |
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Keywords: | Acarus farris Mite control Cabrales cheese Relative humidity |
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