Citrus Canker

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

The most characteristic symptom of HLB is blotchy mottling that appears asymmetrically on the leaf blade. Green islands may also occur; these are small, circular, dark green dots that contrast with the light yellow/green background. Foliar symptoms that resemble nutrient deficiencies may be present. A tree may exhibit yellow shoots or other nutrient deficiency symptoms on one or more branches randomly in the canopy. Fruit may be small and lopsided or ripen backward, with the stylar end remaining green as the fruit colors.

Management tips: Citrus greening has not been found in Alabama to date. If citrus greening is suspected, contact your local diagnostic lab.

 

Read more about Citrus Pest Identification and Management Guide.

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

*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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