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Plantwise Technical Factsheet

mealy plum aphid (Hyalopterus pruni)

Host plants / species affected
Armoracia rusticana (horseradish)
Arundo donax (giant reed)
Coriandrum sativum (coriander)
Lupinus (lupins)
Malus domestica (apple)
Pennisetum glaucum (pearl millet)
Phragmites australis (common reed)
Prunus (stone fruit)
Prunus armeniaca (apricot)
Prunus avium (sweet cherry)
Prunus domestica (plum)
Prunus dulcis (almond)
Prunus persica (peach)
Prunus salicina (Japanese plum)
Prunus spinosa (blackthorn)
Pyrus communis (European pear)
Ribes rubrum (red currant)
Solanum tuberosum (potato)
Sorghum bicolor (sorghum)
Spiraea vanhouttei (Bridal wreath)
List of symptoms/signs
Fruit  -  malformed skin
Fruit  -  premature drop
Leaves  -  abnormal leaf fall
Leaves  -  external feeding
Leaves  -  honeydew or sooty mould
Leaves  -  leaves rolled or folded
Symptoms
Feeding damage weakens fruit trees, reducing vigour and sugar content of fruit and sometimes causing slight curling of the leaves. Honeydew is produced by the aphid, which can crack fruit and be colonized by sooty mould fungi, often making fruit unfit for sale (Bindra and Varma, 1977).
Prevention and control

The preferred period for chemical control is during the delayed dormant period to kill eggs. Mineral oils, diazinon, chlorpyrifos and esfenvalerate can be used. Application of mineral oils during winter, however, can cause some young shoots to burn or die back, especially in years when trees are water-stressed, or have recently been subjected to freezing temperatures or to dry winds.

Insecticides can be applied during April (if oil is used) or May (for other materials) if control has not been achieved with the delayed dormant treatment. A suitable threshold when aphids are present in spring is an average of more than three colonies per tree. Appropriate insecticides for spring use include diazinon and neem oil.

Impact
H. pruni has been implicated in the spread of plum pox potyvirus, potato Y potyvirus and millet red leaf luteovirus (for example, de Bokx and Piron, 1990; Avinent et al., 1994; Gaborjanyi and Basky, 1995), but is not listed as a virus vector by Brunt et al. (1996).
Related treatment support
 
External factsheets
University of California Afghan Agriculture Factsheets, University of California, 2009, English language
University of California Afghan Agriculture Factsheets, University of California, 2009, Pashto language
University of California IPM Pest Management Guidelines, University of California, 2007, English language
University of California Afghan Agriculture Factsheets, University of California, 2007, English language
University of California Afghan Agriculture Factsheets, University of California, 2009, English language
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