• Arizona Cooperative Citrus Registration-Certification Program Celebrates Silver Anniversary

      McDonald, H. H.; Butler, Marvin (College of Agriculture, University of Arizona (Tucson, AZ), 1991-01)
      New methods of determining the content of virus and virus-like disorders in citrus trees are heralding a new era of the Arizona Cooperative Citrus Registration-Certification Program (ACCRCP). It has been 25 years since the first budwood was released to participating nurseries. During that time, the program has relied on indexing using various indicator plants. Last year, indexing was begun in the laboratory using the ELISA unit for tristeza tests. Efforts are now being made to obtain antiserum for stubborn disease which currently has no reliable indexing method using indicator plants.
    • California Red Scale Again Eradicated from Yuma County

      McDonald, H. H.; Butler, Marvin (College of Agriculture, University of Arizona (Tucson, AZ), 1991-01)
      Since 1973, Yuma County has had three apparently unrelated infestations of California Red Scale (CRS). The Yuma County citrus Pest Control District (YCCPCD) was successful in eradicating the first two in 1980 and 1984, respectively. We are continuing our spray program on the third, but our detection methods indicate that this infestation has now also been eradicated.