|
German Version
Site map
FAIR 3889
Virus diseases
Phytoplasma diseases
AP
ESFY
PD
Pathogen collection
Pathogen detection
Pathogen elimination
Contact us
Related Sites
|
Apple Proliferation
(AP)
Apple proliferation is caused by a phytoplasma that ranges in size from
140 to 700 nm and is localized in sieve tubes.
Apple proliferation is found naturally in infected apple and does not
seem to survive in other fruit tree species.
It induces variable symptoms,
typical for hormonal irregularities:
- rosettes of dehydrated leaves that crumble easily and roll in a cone
- breaking of apical dominance and feathering with numerous lateral
shoots at a very narrow angle (15°) at the end of summer (´witches
broom´)
- reduction of leaf size, but growth of stipules
- reduced flowering and phyllody (transformation of white petals into geen
leaflets)
- growth of abundant, but thin, root hairs
- fructification is often reduced by half and sometimes totally inhibited
In Europe the disease is epidemic in regions with semi-continental climate. It is
unknown in North and South America.
|
