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• Stormwater drainage impairment. <br />The USDOI, USGS and the Florida Department of Natural <br />Resources Bureau of Geology have created a map illustrating <br />sinkhole type, development, and distribution for the state of <br />Florida. Sinkhole risk is categorized using four categories. <br />According to this map, Indian River County lies in Area II, <br />which is classified as having coverage between 30 and 200 <br />feet thick, consisting of incohesive and permeable sand. <br />Sinkholes are few, shallow, of small diameter, and develop <br />gradually. Cover -subsidence sinkholes dominate in this area. <br />Extent: There is no risk assessment data available for seismic <br />hazards (sinkhole only) in Indian River County. <br />n. Agricultural Pests and Diseases — Hazard Identification. <br />Florida is among the top three agriculture -producing states in <br />the nation. Agriculture generates farm cash receipts of nearly <br />$6 billion annually, of which citrus and vegetable crops <br />contribute more than 40%. The industry is susceptible to many <br />hazards including freezes, droughts, and exotic pests or <br />diseases. Agricultural crops are grown throughout the state, <br />and every region is vulnerable to the effects of an exotic pests <br />or disease infestation. As a result, Florida uses the second <br />highest volume of pesticides in the nation. <br />Agriculture and citrus production play a key role in the Indian <br />River County economy; 52% of the County is farmland. The <br />main threats to the Indian River County agriculture industry are <br />1) Citrus canker, 2) Mediterranean fruit fly (Medfly), 3) <br />Sugarcane pests, and 4) Tomato Yellow Leaf Curl Virus <br />(TYLCV). <br />Extent. Best available data do not indicate that there have <br />been incidents of agricultural pests and diseases in Indian <br />River County or the municipalities. <br />o. Citrus Canker and Citrus Greening — Hazard Identification. <br />Citrus canker was found in Dade County in 2005, and by 2008 <br />it had spread to 32 counties with Florida. Citrus canker is a <br />bacterial disease of citrus that causes premature leaf and fruit <br />drop. It affects all types of citrus, including oranges, sour <br />oranges, grapefruit, tangerines, lemons, and limes. Symptoms <br />found on leaves and fruit are brown, raised lesions surrounded <br />by an oily, water -soaked area and a yellow ring or halo (Indian <br />Indian River County Comprehensive Emergency Management Plan Basic Page 57 <br />