UCR is home to the Citrus Variety Collection (CVC), a field collection of living trees amassed over the past 108 years which contains 1,038 cultivars, species of citrus, and related genera. In July and August 2017, three trees were discovered in the City of Riverside that were infected with the Huanglongbing (HLB) disease, which is spread by the Asian citrus psyllid. These trees were discovered approximately 2.25 miles from UCR's CVC, which presents a threat to the CVC. If trees in the CVC are determined to be infected with HLB, the California Department of Food and
Agricultural (CDFA) will require their removal, which would adversely impact the continued preservation of citrus diversity. The proposed Project seeks to construct a protective screened structure for the CVC to protect against HLB infection. The proposed Project involves construction and installation of a screened enclosure covering Field I IC, consisting of 50-mesh polyethylene sidewall netting and 40-mesh polyethylene roof-netting. The enclosure is proposed to be 18 feet in height and would be supported by a grid of galvanized steel posts, to be spaced approximately 16- by 28-feet apart. The steel posts would be placed into 24-inch square concrete
footings, measuring approximately 6-feet in depth. The structure would include two screened compartments to separate the trees propagated from registered and non-registered sources.