The Valencia orange is a sweet orange. Investigators found that it was a pigmented bud sport of a conventional Valencia orange tree. He is credited with establishing the state's citrus industry and developing the Valencia orange. Lemon and late maturing citrus, such as Valencia orange, are the most susceptible hosts. The Midknight Valencia orange is a South African variety of the standard Valencia orange. Smith Red Valencia is a pigmented bud sport of a conventional Valencia orange tree. The 'Midknight' Valencia orange is a South African variety of the standard Valencia orange. He had 800,000 Valencia orange trees planted, with full production expected by 1967. Del Valle acquired his first Valencia orange seedlings in 1857 from his friend William Wolfskill.