Citrus Black Spot is a disease that first appeared in southwest Florida in 2010. It affects fruit rind and leaves, and can cause fruit to drop early. The four main symptoms are: false melanose, early virulent spot, cracked spot, and hard spot. All commercial cultivars are susceptible to citrus black spot, though it appears most common in lemons and maturing oranges.
A citrus canker is an infection that spreads easily through storms, irrigation, human movement, birds, other animals. Symptoms include stem lesions, fruit lesions, blemishes and early fruit drops. Grapefruit, lemons, navel, and certain early oranges are highly susceptible to citrus cankers.
Citrus Greening is a disease that affects all varieties of citrus plants. Symptoms can arise at any time of the year and can include yellowing in the veins that create a “blotchy mottle.” Greening causes a reduced production of fruit and an increase in fruit deformities, thus heavily impacting fruit production.
The rugose spiraling whitefly was first discovered in the Miami-Dade area on 2009, though it is suspected to have originated from Central America. This particular pest feeds off of many plants, including gumbo limbo, black olive, and many palms which are abundant in Florida. Symptoms include a waxy, white substance on the underside of leaves and black, sooty mold.
Sweet Orange Scab is an unsightly fungal disease that affects citrus fruit. Symptoms include scab-like lesions that appear mostly on the rinds of the fruit. Although the fruit’s internal quality remains unscathed, the cosmetic effects does reduce the fruit’s market value.