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During 2004-2005 our research focused on several areas. The first was testing a new gel- based diet developed to take the place of the agar sugar block diet used to feed adult Tephritid flies prior to sterile insect technique (SIT) releases. Unfortunately, the gel formulation was deficient in protein which resulted in production of adults that were not efficient in producing pheromone or attracting females (Figures 1, 2). Formulation of the gel diet with additional protein, needed to improve reproductive competence, yielded an inconsistent formulation. Additionally, the gel diet was expensive and labor intensive to formulate. As such the gel diet was judged a poor substitute for the agar/sugar blocks.
The purpose of this research program is to determine how insecticides can be used most effectively, with as little disruption of natural enemies as possible, as part of the citrus IPM program. Information derived from this project is used to update the UCIPM Pest Management Guidelines, produce Arthropod Management Test articles and help support registration of insecticides.
Septoria spot of citrus caused by Septoria citri is found in many citrus-producing countries around the world. It is a sporadic disease in California with most reports coming from Tulare Co. and Fresno Co. The pathogen is present on leaves and twigs in many orchards, and fruit infections probably occur commonly. Disease from these quiescent infections, however, only develops when plant tissues become senescent or environmental conditions predispose the host to infection.
Seedy citrus fruit are a major quality issue and of significant concern to the citrus industry. Elimination of seed formation would be a valuable trait for many citrus cultivars, especially the mandarin varieties and seedy lemon varieties. In this project we will evaluate the role of ovule specific regulation of auxin to induce parthenocarpy in citrus.
As specifically provided for in the California Citrus Improvement Program marketing order, this ongoing Quality Assurance Program is conducted by the California Citrus Quality Council (CCQC) under an operating agreement with the California Citrus Research Board.
The California Citrus Clonal Protection Program (CCPP) is a part of the University of California, Riverside, Department of Plant Pathology. The CCPP is a cooperative program with the California Department of Food and Agriculture (CDFA), the United States Department of Agriculture Animal and Plant Health Inspection Service (USDA-APHIS) and the citrus growers of the state of California represented by the Citrus Research Board.
Stubborn disease of citrus, caused by Spiroplasma citri, is an important disease of citrus in the hot, arid inland areas of California and Arizona. The two methods most commonly used for detection of stubborn have been biological indexing and culture in a cell-free medium. Indexing for stubborn disease of citrus is difficult since it requires the somewhat tricky side-graft or leaf vein method, and it takes several months to obtain results. Culturing is also somewhat time consuming, sometimes requires several attempts, and can produce false positives from contamination. Culturing is the test of record for CDFA and most regulatory agencies.