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Plantwise Technical Factsheet

apple aphid (Aphis pomi)

Host plants / species affected
Chaenomeles (flowering quinces)
Chaenomeles japonica (Japanese quince)
Cotoneaster frigida
Cotoneaster pannosa
Crataegus (hawthorns)
Crataegus crus-galli (Cockspur hawthorn)
Crataegus monogyna (hawthorn)
Cydonia (quince)
Cydonia oblonga (quince)
Malus (ornamental species apple)
Malus coronaria (sweet crab-apple)
Malus domestica (apple)
Malus ioensis (prairie crab-apple)
Malus sylvestris (crab-apple tree)
Mespilus (medlar)
Mespilus germanica (medlar)
Pyrus (pears)
Pyrus calleryana (bradford pear)
Pyrus communis (European pear)
Rosa (roses)
Sorbus (rowan)
Sorbus commixta (japanese rowan)
Sorbus torminalis (rowan)
Spiraea salicifolia (Bridewort)
Spiraea vanhouttei (Bridal wreath)
List of symptoms/signs
Fruit  -  abnormal shape
Growing point  -  external feeding
Inflorescence  -  external feeding
Inflorescence  -  honeydew or sooty mould
Leaves  -  abnormal colours
Leaves  -  abnormal forms
Leaves  -  abnormal leaf fall
Leaves  -  external feeding
Leaves  -  honeydew or sooty mould
Leaves  -  leaves rolled or folded
On apple and other fruit trees, A. pomi causes loose or slight curling of leaves. Aphids colonize young growth and are generally restricted to the tips of young shoots. Dense colonies can form and infestation reduces the greenness of apple leaves. A. pomi also causes the formation of pseudogalls on apple by direct feeding on the young leaves. These pseudogalls remain green, unlike the red and more pronounced pseudogalls caused by the feeding of the rosy leaf-curling aphid, Dysaphis devecta. High densities of A. pomi produce sufficient honeydew to promote the growth of sooty moulds. Stunted shoots and disfigured fruit can result from high infestations.
Prevention and control

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

A. pomi is an important pest of apples in the USA. It is also a significant apple pest throughout Europe and the countries of the former USSR. It causes most damage in apple orchards in the spring, when the flower buds are opening. However, it is a pest throughout the apple growing season. As A. pomi breeds continuously on apple it can reach high densities in summer and autumn, depositing honeydew which sometimes causes fruit russet and is a substrate for sooty moulds. High densities in spring can disfigure fruit. On young trees, leaves may prematurely fall, while reduced shoot growth can result. Studies have shown that direct feeding reduces chlorophyll content and photosynthesis of apple leaves (Kaakeh et al., 1993), with subsequent effects on yield.
Related treatment support
Plantwise Factsheets for Farmers
Omid, S. A.; CABI, 2012, English language
Omid, S. A.; CABI, 2012, Dari language
Pest Management Decision Guides
Naser, M.; CABI, 2014, Dari language
Naser, M.; CABI, 2014, English language
External factsheets
Ontario CropIPM factsheets, Ontario Ministry of Agriculture, Food and Rural Affairs, Canada, 2015, English language
Ontario CropIPM factsheets, Ontario Ministry of Agriculture, Food and Rural Affairs, Canada, 2015, French language
Bayer CropScience Crop Compendium`, Bayer CropScience, English language
University of California IPM Pest Management Guidelines, University of California, 2011, English language
Plant Health Australia Factsheets, Plant Health Australia, English language
Video factsheets
Northeastern IPM Center Videos, Northeastern IPM Center, 2016, English language
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