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Anthracnose
The anthracnose fungus usually infects weakened twigs. The disease is most common during springs with prolonged wet periods and when significant rains occur later in the season than normal. During wet or foggy weather, anthracnose spores drip onto fruit, where they infect the rind and leave dull, reddish to green streaks on immature fruit and brown to black streaks on mature fruit (tear stains).
Symptoms of anthracnose on citrus include twig dieback, premature leaf drop, dark staining on fruit and postharvest fruit decay. Dying leaves and twigs become covered with dark fungal spores by which the pathogen spreads.
A KEY MEASURE TO PREVENT AND CONTROL THE LATENT INFECTION OF ANTHRAX BACTERIA is to spray once in the tender shoot stage of spring, summer and autumn, and 2-3 times within a month after falling flowers, once every 10-15 days, to prevent and control the invasion of anthrax bacteria into young fruits.