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With average-quality copper products, about 2 lb of metallic copper per acre is usually sufficient for scab control. If canker is a concern, the only product that can manage both diseases is copper. In those cases, copper fungicides, Abound, Gem, or Headline may be preferred because Ferbam and Enable 2F are less effective for Alternaria control.
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On Minneola tangelos, Murcotts, and certain other varieties, Alternaria brown spot and scab can occur in the same grove. However, copper products are less effective for scab and should not be selected where scab pressure is high. Copper fungicides, Abound, Gem, or Headline are good choices for the third spray because they will protect fruit from early melanose as well as from scab. Any of these products can be used in the petal fall spray, but do not use strobilurin products (Abound, Gem, or Headline) twice in a row. Ferbam, Enable 2F, Abound, Gem, or Headline are good choices for the first application because they are all able to kill the fungus in old lesions and thus reduce inoculum as well as protect foliage. Timing of the fungicide applications is critical for citrus scab management, but if there is little carryover of disease from the previous season, the first spray can be omitted. If leaves from the previous season are heavily infected by citrus scab, 3 applications of fungicide are needed to control the disease: the first at about 1/4 expansion of the spring flush, a second at petal fall, and a third about three weeks later. Spores are spread to healthy tissues by water splash.
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One to 2 hours of wetting are sufficient for spore production, and only an additional 3–4 hours are needed for infection. Spores of this fungus are produced directly on scab pustules that occur on leaves and fruit. Reduction or elimination of foliage wetting on susceptible varieties during the active growth period of the fruit will decrease disease severity. There is no need to control citrus scab on processing fruit, except possibly on Temples, where severe early infection reduces fruit size. Citrus scab, caused by the fungus Elsinoë fawcettii, affects grapefruit, Temples, Murcotts, tangelos, and some other tangerine hybrids.