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Fruit Tree Pests & Diseases


Growing fruit is an enjoyable and rewarding past time, however even the most avid and vigilant of gardeners may occasionally encounter a problem.  To help you tackle any challenges posed by mother nature we have put together a range of fact sheets that will assist you in the fruit garden with pest and disease management.  

The following tables have been designed to aid diagnosis and treatment of common fruiting problems.  We hope to update it as more information becomes available.

Click here for information on soft fruit pests and diseases.



Apple and Pear Pest, Diseases and Disorders

Symptoms Possible Problems Symptoms Possible Problems
Leaf distortion/
Marking on leaves
Aphids
Apple Mildew
Pear Leaf Blister Mite
Pear Leaf Midge
Spider Mite
Apple Leaf Miner
European Pear Rust
Scale Insect
Tortrix Moth
Blossom Damage  Apple Blossom Weevil
 Apple Mildew
Leaves/shoots
dying off
Apple/Pear Canker
Apple Mildew
Fireblight
Frost damage
Maggots in fruit  Apple Sawfly
 Codling Moth
 Pear Midge
Holes in leaves Green Capsid Bug
Winter Moth
Marked/
distored fruit
 Aphids
 Apple Sawfly
 Apple/Pear Scab
 Bitter Pit
 Brown Rot
 Green Capsid Bug
 Winter Moth
Disfigured/
cracking bark
Apple/pear Canker
Fireblight
Woolly Aphid
Scale Insect
Fruit Drop

Apple Sawfly
Codling Moth
Frost damage
Incomplete pollination
Pear Midge
Winter Moth
Fruit Drop (June Drop)

Fruiting disorders Biennial cropping    


Apricot Pests, Diseases & Disorders

Symptoms Possible Problems Symptoms Possible Problems
Leaf distortion/
marking on leaves

 Aphids
 Silver Leaf
 Spider Mite
 Powdery Mildew
 Scale Insect

Discoloured/
cracking bark
Bacterial Canker
Leaves/shoots/
branches dying off

Apricot dieback
Bacterial Canker
Frost damage
Silver Leaf

Marked/distorted fruit Aphids
Brown Rot
Holes in leaves  Bacterial Canker Fruit drop Frost damage
Incomplete pollination


Cherry Pests, Diseases & Disorders

Symptoms Possible Problems Symptoms Possible Problems

Leaf distortion/marking on leaves

Aphids
Apple Leaf Miner
Silver Leaf
Spider Mite
Scale Insect

Discoloured/
cracking bark 
 Bacterial Canker
 Leaves/shoots dying off

Bacterial Canker
Frost damage
Silver Leaf

Marked/distorted fruit Aphids
Brown Rot
Green Capsid Bug
Winter Moth
 Holes in leaves  Bacterial Canker
 Green Capsid Bug
 Winter Moth
Fruit Drop  Frost Damage
 Cherry Run-off
 Incomplete Pollination
 Winter Moth

 

 Cobnuts & Filberts Pests Diseases & Disorders

Squirrels are the most serious pest since they can quickly devour a whole crop.  Netting is usually ineffective as they can chew through it.  Galvanised wire netting is effective but can lead to problems of zinc toxicity.  The fruits can be attacked by Nut Gall Mites, Nut Weevils and Winter Moth larvae.  The trees are generally free from disease.


Figs Pest, Diseases & Disorders

Squirrels and birds are the most serious pests.  The trees are generally free from disease but occasionally suffer from Coral Spot (dead twigs become covered in pink pustules).  Disease twigs should be cut back to a healthy bud and the prunings should be burned.  


Peach, Nectarine & Almond Pests, Diseases & Disorders

 

Symptoms Possible Problems Symptoms Possible Problems

Leaf distortion/marking on leaves

Aphids
Peach Leaf Curl
Silver Leaf
Spider Mite
Powdery Mildew
S
cale Insect

Maggots in fruit

Plum Fruit Moth

 Leaves/shoots dying off

Bacterial Canker
Frost damage
Silver Leaf

Marked/distorted fruit  Aphids
 Brown Rot  
 Holes in leaves Fruit Drop  Frost Damage
 Incomplete Pollination
 Plum Fruit Moth
 Discoloured/
 cracking bark 
 Bacterial Canker    


Plum, Gages, Damson & Cherry Plum Pests, Diseases & Disorders

 

Symptoms Possible Problems Symptoms Possible Problems

Leaf distortion/
marking on leaves

Aphids
Apple Leaf Miner
Rust
Silver Leaf
Spider Mite
Powdery Mildew
Scale Insect

Blossom damage

Frost Damage

 Leaves/shoots dying off  Bacterial Canker
 Frost damage
 Silver Leaf
Maggots in Fruit  Plum Fruit Moth
 Plum Sawfly -
 (See Apple Sawfly)
 Holes in leaves  Bacterial Canker
 Green Capsid Bug
 Winter Moth
Marked/distorted fruit   Aphids
 Brown Rot
 Green Capsid Bug
 Winter Moth
 Pocket Plum
 Disfigured/cracking bark  Bacterial Canker Fruit Drop  Codling Moth
 Frost damage
 Incomplete pollination
 Plum Fruit Moth
 Winter Moth


Quince & Medlar Pests, Diseases & Disorders

Symptoms Possible Problems Symptoms Possible Problems

Leaf distortion/
marking on leaves

Aphids
Quince Leaf Blight
Spider Mite
Scale Insect

Blossom damage

Apple Blossom Weevil

 Leaves/shoots dying off

Apple Canker
Frost damage

Maggots in Fruit  Apple Sawfly
 Codling Moth
 Holes in leaves
 Green Capsid Bug

Marked/distorted fruit   Aphids
 Apple Sawfly
 Brown Rot
 Green Capsid Bug
 Disfigured/
 cracking bark
 
 Apple Canker
Fruit Drop  Apple Sawfly
 Codling Moth
 Frost Damage
 Incomplete Pollination  

 

Sweet Chestnuts & Walnut Pest, Diseases & Disorders

The sweet chestnut is relatively free from pests and diseases. Most pests of walnuts, including the Walnut Leaf Gall Mite, are not too serious and can cause mostly cosmetic damage. Walnuts are susceptible to some diseases including Walnut Blight, Walnut Leaf Blotch, Honey Fungus and Grey Mould.


Click here for information on soft fruit pests and diseases.


USING CHEMICALS SAFELY – ALWAYS READ THE LABEL

When using chemicals it is most important to follow the manufacturer’s instructions precisely.  Only use on the fruits that are listed on the manufacturer’s label.  An accurate weighing machine and measuring cylinder should be obtained.  Chemicals can be wasted by making concentrations unnecessarily strong or by making them too weak and ineffective.  Furthermore, if chemicals are too strong they may cause damage to the foliage.

Only spray in the early morning or evening when the weather is dry and calm.  Avoid spraying when fruit canes and bushes are in flower, to reduce the risk of killing helpful pollinating insects such as bees.