Tree Fruit Field Manuals

Nitrogen Deficiency
Causes reduced growth, small leaves, color is yellowish or lacking dark…
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Phosphorus Deficiency
Young and nearly matured leaves dark green, while mature leaves are…
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Potassium Deficiency
In prunes leaves turn yellow then brown and often defoliate. The symptom…
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Sulfur Deficiency
A deficiency of sulfur looks very much like nitrogen deficiency. Leaves…
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Magnesium Deficiency
Most pronounced on apple trees, especially Golden, Winesap and Newtown…
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Calcium Deficiency
Cork spot or bitter pit of apple and cork spot and black end of pear have…
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Iron Deficiency
Associated with alkaline soils usually moderate to excessively wet. Leaves…
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Zinc Deficiency
Zinc deficiency affects the growing points. Typically the extreme terminal…
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Manganese Deficiency
Causes interveinal chlorosis of leaves with little leaf as in zinc…
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Copper Deficiency
Copper deficiency causes rough bark and dieback.
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Boron Deficiency
Causes cork spot in apples and apricots and also cracking in apricots.…
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Herbicide Injury
Herbicide injury often appears as interveinal chlorosis similar to zinc or…
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Verticillium Wilt of Stone Fruit
Symptoms of this fungus disease are associated with water stress.…
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Apple Scab
While apple scab is the most common disease of apples, it is seldom…
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Brown Rot
Blossom and twig blights, fruit rot and cankers may result from infection…
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Powdery Mildew
This fungus disease is characterized by the powdery appearance of infected…
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Peach Leaf Curl
Leaf buds become infected as they swell in early spring. Infected leaves…
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Coryneum Blight or Shot Hole Disease
This fungus disease attacks leaves, fruits and woody tissue.The disease…
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Cytospara Canker
This fungus disease is caused by a wound-infecting parasite. The disease…
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Crown or Collar Rot of Apple
This fungus disease is frequently spread by irrigation water. Generally…
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Fire Blight
This disease of pears (and occasionally apples) is caused by a bacterium.…
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Bacterial Canker
The bacterium that causes this disease produces several different symptoms…
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McDaniel Spider Mite (Tetranychus mcdanieli)
McDaniel spider mites are also found on all tree fruits. Adults are green…
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European Red Mite (Panonychus ulmi)
European red mites are found on all tree fruits and overwinter as bright…
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Rosy Apple Aphid (Dysaphis plantaginea)
This rosy colored pest curls the leaves of apple trees and can cause a…
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Woolly Apple Aphid (Eriosoma lanigerum)
Although seldom a serious economic problem, woolly apple aphids in high…
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Apple Aphid (Aphis pomi)
Occasionally high populations of apple aphids early in the spring cause…
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Green Peach Aphid (Myzus persicae)
Green peach aphids overwinter as glossy black eggs on peach tree twigs and…
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Leaf Curl Plum Aphid (Anuraphis helichrysi)
Leaf curl plum aphid occurs on prunes and apricots. It causes tightly…
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Pear Rust Mite (Epitrimerus pyri)
Pear rust mites have caused increasing damage on fresh market pears in…
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Codling Moth (Laspeyresia pomonella)
Codling moth is a major pest on apples and pears. Adults are greyish brown…
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Oriental Fruit Moth (Grapholitha molesta)
Oriental fruit moth attacks peaches, apricots, and prunes. It overwinters…
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San Jose Scale (Aspidiotus perniciosus)
San Jose Scale is potentially one of the most damaging pests and appears…
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Pear Psylla (Psylla pyricola)
Pear psylla overwinter as adults under bark or under leaves on the ground.…
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Cherry Fruit Fly (Rhagoletis cingulata)
One cherry fruit fly larva found in a box of packed cherries can get an…
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Shot Hole Borer (Scolytus rugulosos)
Shot hole borer is found in all tree fruits. It winters as immature larvae…
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Peach Twig Borer (Anarsia lineatella)
Another pest of peaches, apricots, and prunes, the peach twig borer…
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Peach Tree Borer (Sanninoidea exitiosa)
Gum at the base of the tree and poor tree condition are evidence of the…
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