Crown rot Do not plant trees on susceptible rootstocks on wet sites. Ensure that drainage is adequate prior to planting. Selecting the right site initially is important. Trees are most at risk from crown rot when they are young and are being lifted from …
Planting high grafted trees (minimum 40-70 cm above soil level), or trees with resistant interstocks, will ensure that susceptible scions are less prone to infection by soil splash. In mature orchards, keep tree trunks clean of weeds. Check regularly …
Crown rot For crown rot, most damage is already done by the time foliar symptoms are evident. Therefore, corrective treatments are not usually worthwhile. For crown rot, trees showing foliar symptoms are usually too badly damaged to save. These should be …
Harris, D C (1991). The Phytophthora diseases of apple. Journal of Horticultural Science, 66, 513-54 …
Disease status Other hosts Distribution Varietal susceptibility Susceptibilty of some apple rootstocks to pest and diseases Disease cycle and epidemiology Symptoms and recognition Disease monitoring and forecasting Cultural control methods Biological …
Crown rot and collar rot are distinct diseases : Collar rot is a disease of the scion which usually only attacks mature trees >10 years old and mainly Cox. Crown rot is a disease of the rootstock which, in the UK, is mainly a disease of young trees in the …
Adults occur from October to January but are most numerous in November and December. On emergence from pupation, the spider-like female crawls up the trunk of the tree and after mating, lays 100-200 eggs singly in crevices in the bark. Eggs hatch in …
Important pest of apple and pear. Attacks fruit directly and so is damaging at low population densities, though can be controlled readily with …
A wide range of deciduous and coniferous trees, especially oak. …
All varieties of apple and pear are susceptible and host plant resistance is not known to occur. …
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