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Peach rosette phytoplasma
Peach rosette phytoplasma
Synonyms
 
  • peach rosette virus 

Plant hosts
 
Peaches (Prunus persica) are the principal host of peach rosette phytoplasma, but the disease is also significant on plums (P. salicina). Other Prunus spp. can be infected such as almonds (P. dulcis), apricots (P. armeniaca), cherries (P. avium and P. cerasus), and ornamental and wild Prunus spp.

Symptoms
 
Symptoms of peach rosette phytoplasma are very similar to those caused by peach rosette mosaic nepovirus. On peaches, new shoots have very short internodes causing the leaves to be in very tight clusters or brooms. The leaves of the older shoots prematurely fall in early summer leaving only bunches of young leaves on the tips of naked shoots. Flowers rarely set fruit. The most severely affected trees die during their first year of disease. Other fruits (Almonds and plums), show similar symptoms. Infected plum trees are seriously stunted.
 
Image of peach rosette phytoplasma symptoms
 
Symptomatic tree with peach rosette phytoplasma
 
Image courtesy of W.R. Allen

Transmission
 
No specific insect vector is known and spread by presumed vectors is only local.  The pathogen is most likely to be spread internationally in infected planting material. 

Geographic distribution
 
Italy - a disease resembling peach rosette phytoplasma has recently been reported although true identity needs to be confirmed by molecular identification
 
USA - Georgia and southeastern states as far west as Texas 

Applicable regulations
 
603-052-0118, Quarantine; Peach rosette phytoplasma
 
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