CITRUS PHYSIOLOGY

Citrus - Twig Dieback
Twig dieback can be caused by several fungi, as well as by other factors. Fungal infection often occurs following a freeze or mechanical or chemical injury.
Size: 1.5 K

Citrus - Spray Burn
The fruit has a dry, brown sunken spot.
Size: 1.1 K

Citrus Sooty Mold
Leaves, fruit and sometimes branches have a black, moldy appearance. The fungi causing sooty mold do not actually infect the plant, instead they grow on the sugary exudates of insects such as aphids, brown soft scale, blackflies and whiteflies.

Citrus - Sunscald
Irregular, brown pustules are found on the underside of leaves [Picture]. This occurs when the undersides of leaves are suddenly exposed to direct sunlight, for example, after harvest because of repositioning of limbs and leaves after removal of the fruit that had bent them downward.

Citrus - Wind Scar
This damage occurs as the result of twigs or leaves rubbing against young fruit [Picture]The injury develops early, i.e. within the first couple of months post-bloom.
Size: 1.3 K