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Colorado potato beetle regulation
Colorado potato beetle (CPB), Leptinotarsa decemlineata, is an insect pest of tomato (Lycopersicon esculentum), pepper (Capsicum frutescens), potato (Solanum tuberosum), eggplant (Solanum melongena) and other Solanaceous plants. CPB causes damage to hosts; as both adults and larvae feed on foliage, decimating the plant. The adult beetle can be easily recognized by the distinctive yellow and brown striping on forewings. Adult beetles overwinter in soil and immerging in May to feed on leaves. Eggs are laid on undersides of host leaves. Hatching larvae feed on leaves for approximately three weeks, then will burrow into the soil and emerge as adults. Two generations of adults are the norm per year.

L. decemlineata is thought to have originated in Mexico as a host on nightshade. CPB has spread throughout North America with the introduction of the cultivated potato.

The California Department of Agriculture has in established a state exterior quarantine to prevent the introduction of Colorado potato beetle. This exterior quarantine prohibits hosts of Leptinotarsa decemlineata to be shipped from Oregon and other states with the exception of Alaska, Hawaii, and Nevada. Quarantined hosts of CPB include buffalo burr (Solanum rostratum), eggplant (Solanum melongena), Irish potato (Solanum tuberosum), nightshade (Solanum dulcamara) pepper (Capsicum frutescens), tomato (Lycopersicon esculentum). Irish potato tubers and soil in association with or attached to tubers or plants are also included in the quarantine.

Nurseries wanting to ship host material must present a certificate of quarantine compliance (CQC) issued by an authorized official from the state of Oregon. The CQC must state that it has been determined by official inspection, that the host plants and associated soil of covered commodities were found to be free of L. decemlineata. Exemptions include plant tuber free from soil and plant parts and seedling plants with a height of 8 or less inches and sent between January 1 through March 31.