My Citrus Tree – Disorders

Orange Header Image

ORANGE – Citrus Variety Info

In this section of citrus varieties the orange is a hybrid of ancient cultivated origin, possibly between pomelo (Citrus maxima) and mandarin (Citrus reticulata).[2] It is a small flowering tree growing to about

Read More »

Citrus Tristeza

Tristeza is vectored by several species of aphid the most efficient being the brown citrus aphid Toxoptera citricida (Kirklady). Where T. citricida does occur, Aphis

Read More »

Orange Scab

Sweet orange scab forms spores on the surface of the scab pustules. This species of scab attacks mainly fruits. The conidia ( asexual spores) are

Read More »

Citrus Psorosis

Psorosis is transmitted by grafting. There is some evidence of natural spread, possibly by Olpidium brassicae which transmits other ophioviruses, or by an aerial vector.

Read More »

Citrus Pseudocercospora

Pseudocercospora angolensis is a fungus that requires moisture for infection and the production of wind-borne conidia. Other than by wind, conidia can be transported on

Read More »


Phytophthora is a water mold (Class Oomycetes, formerly a fungus-like protist) that is found throughout the world. Under favorable conditions (high moisture and temperature) it

Read More »

Citrus Melanose

Melanose is a saprophyte that completes its lifecycle on dead twigs. The disease severity is determined by the amount of inoculum on dead wood in

Read More »

Citrus Leprosis

Citrus leprosis virus (CiLV) is transmitted by the false spider mites in the genus Brevipalpus (Acari: Tenuipalpidae). Brevipalpus mites occur on citrus around the world

Read More »

Citrus Greening

Huanglongbing (HLB) is presumptively caused by a phloem limited bacteria. In citrus there are three forms of concern, the Asian, African and American forms. The

Read More »

Greasy Spot

The major source of inoculum for greasy spot are wind-dispersed sexual spores (ascospores) produced during periods of wetness on decomposing fallen leaves. The disease cycle

Read More »

Citrus Stubborn Disease

CSD is caused by Spiroplasma citri, a phloem-limited, cell-wall-less bacterium. S. citri is transmitted in a propagative, circulative manner by several leafhoppers including Circulifer tenellus

Read More »

Citrus Scab

Conidia are produced on the surface of scab pustules. These spores spread to new susceptible tissue. There are two kinds of spores, clear oval shaped

Read More »

Your Source For Dooryard Citrus Growing...

Tips and tricks for success in growing citrus in the backyard and container. Plus answers to common citrus growing questions.

Recent Posts

Follow Us