Citrus Greening

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*This is an excerpt from Citrus Pest Identification and Management Guide, ANR- 2270.

Foliar lesions have raised, concentric circles on the underside of the leaf. Lesions frequently are surrounded by a water-soaked margin and a yellow halo. The middle of the lesion (on underside of leaf) has a corky texture. Fruit lesions consist of concentric circles. On some varieties these circles are raised and have a rough texture; on other varieties the concentric circles are relatively flat. Citrus canker has not been found in Alabama to date. If citrus canker is suspected, contact your local diagnostic lab.

 

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*This is an excerpt from Citrus Pest Identification and Management Guide, ANR- 2270.

Initial symptoms include vein yellowing followed by yellow foliage, poor growth, and shoot dieback. Advanced symptoms consist of leaf and fruit drop, trunk lesions, and tree death. Trunk lesions are found near the crown or below the soil line and may contain bark cracking and gumming.

Management tips: Use resistant rootstock (trifoliate orange). Plant the bud union at least 6 inches above the soil line. Do not overwater. Control ants around the base of the tree. Prevent mechanical injury to the trunk.

 

Read more about Citrus Pest Identification and Management Guide.

Download a printable PDF of Citrus Pest Identification and Management Guide, ANR- 2270.

*This is an excerpt from Citrus Pest Identification and Management Guide, ANR- 2270.

Citrus scab foliar symptoms consist of fingerlike projections or lesions that may contain a tan pustule at the tip. Fruit symptoms start with slightly raised, brown lesions, which develop into warty or corky protuberances.

Management tips: Prune out heavily infected sections of tree. Three applications of fungicide may be needed: one at one-quarter expansion of the spring flush, a second at petal fall, and a third about 3 weeks later. Ferbam, Enable 2F, Abound, Gem, or Headline are good choices for the first application; all are able to kill the fungus in old lesions, thereby reducing inoculum and protecting foliage. Any of these products may be used in the petal fall spray, but do not use a strobilurin product (Abound, Gem, or Headline) twice in a row. Copper fungicides, Abound, Gem, or Headline are good choices for the third spray, but copper products are less effective for scab and should not be selected where scab pressure is high.

 

Read more about Citrus Pest Identification and Management Guide.

Download a printable PDF of Citrus Pest Identification and Management Guide, ANR- 2270.

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