Welcome to our Citrus Tree Symptom Checker

We've developed this Citrus Tree Symptom Checker as a tool to help understand what citrus tree symptoms could mean. We at GrowScripts feel that the best way to identify what is wrong with your citrus tree is by way of visual examination. Within this section we are bringing together the resources we have used for years to help you identify and treat what is wrong with your lemon tree, lime tree, orange tree, grapefruit tree, or tangerine tree.

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Possible Diagnosis

Citrus Canker

(Click Image to view larger)

Symptoms

Defoliation, Fruit drop, Blemishes on fruit, Blister like lesions on fruit, Round holes in leaves, Raised corky lesions on fruit

Treatment

Copper

Possible Diagnosis

Citrus Greening

(Click Image to view larger)

Symptoms

Yellowing along the veins of normal sized leaves, Blotchy-mottle on leaves, Chlorotic (yellow leaves), Out of season flushing and flowering, Dieback in severe cases, Small lopsided fruit, Unpleasant fruit flavor, Fruit not coloring properly

Treatment

Micronutrients; NPK Fertilizer

Possible Diagnosis

Citrus Alternaria Brown Spot

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Symptoms

Dieback, Defoliation, Leaves show brown spots surrounded by yellow, Blackening of leaf veins, Fruit drop, Sunken brown/black spots with yellow halo on fruit

Treatment

Copper

Possible Diagnosis

Citrus Scab

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Symptoms

Corky outgrowth on leaves, shoots, and fruit, Wart like growths

Treatment

Copper

Possible Diagnosis

Citrus Greasy Spot

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Symptoms

Spores on underside of leaves, Yellow spots on upper side of leaves, Irregular brown blisters that have a greasy appearance, Leaf drop

Treatment

Copper,  Valet, Foliar Micronutrient

Possible Diagnosis

Citrus Phytophthora

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Symptoms

Bark peeling at ground level, Redish-brown resin from trunk

Treatment

T-Guard Preventative Fungicide

Possible Diagnosis

Citrus Sooty Mold

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Symptoms

Black thin mat on fruit and/or leaves

Treatment

Valet

Possible Diagnosis

Citrus Aphids

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Symptoms

Little bugs on plant

Treatment

T-Guard, Imidacloprid

Possible Diagnosis

Citrus Leafminer

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Symptoms

Curling leaves, Serpentine mines on the leaves, Silvery film over the mines

Treatment

T-Guard, Imidacloprid

Possible Diagnosis

Citrus Psyllid

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Symptoms

Leaf distortion and curling

Treatment

T-Guard, Imidacloprid

Possible Diagnosis

Citrus Rust Mite

(Click Image to view larger)

Symptoms

Small Fruit, Brownish/Rust looking fruit

Treatment

Valet

Citrus Tree Nutritional Deficiencies

Manganese Deficiency

Treatment: NPK Fertilizer, Micronutrient

Lighter green pattern on leaves with veins still being dark green; Irregular sized leaves

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Nitrogen Deficiency

Treatment: NPK Fertilizer, Micronutrient

Light yellowish green leaves; Slightly large veins; Thin leaves; Greener new leaves than older leaves, Thin canopy; Small fruit crop

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Zinc Deficiency

Treatment: Micronutrient; NPK Fertilizer

Irregular green bands along the midrib & main veins of leaf; Small yellow splotches on leaves

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Iron Deficiency

Treatment: Micronutrient

Wet soil; Yellow leaves with green veins; Reduced leaf size

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Magnesium Deficiency

Treatment: Micronutrient, NPK Fertilizer

Disconnected yellow areas on leaves; Irregular yellow blotches near midrib of mature leaves; Inverted V shape pointed on the midrib

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