Spring applications of formic acid for control of Acarapis woodi
Wilson, W.T.; Collins, A.M.
American Bee Journal 131(12): 785
ISSN/ISBN: 0002-7626 Accession: 002227583
In southern Oklahoma, USA, tracheal mites were satisfactorily controlled by 3 applications of 40 ml 65% formic acid at weekly or 2-weekly intervals during February and March, when the weather was cool (10-20 degrees C). After the third treatment, > 90% of adult mites were dead (< 17% in untreated controls). Adult and immature bees appeared to be unaffected; but immature mites, especially eggs, were not killed. When 20-ml applications were given, 4 or 5 weekly applications were necessary. Applications of 10 ml were ineffective.