Apple scab is the most economically important disease of apple in the world. All parts of the tree are attacked. Scab infection of fruit is most obvious. Most commercial UK apple varieties are susceptible to scab and Gala is the most susceptible. The …
Powdery mildew is one of the most important diseases of apple in the UK. All parts of the tree are affected, including fruits and it reduces yield and quality and repeated severe attacks gradually debilitate the tree. On susceptible varieties, such as …
Podosphaera leucotricha also attacks pear and quince. There appears to be no host specialisation such that isolates from pear and quince also attack …
Powdery mildew occurs wherever apples are grown, and is generally always a problem in tree nurseries. However, economic loss from mildew varies with climatic conditions. It is generally a serious disease in the UK, particularly the eastern part but …
Apple varieties vary in susceptibility to mildew. Cox, Idared, Golden Delicious, Gala, Fiesta, Jonagold, Elstar are very susceptible. Bramley, Worcester, Saturn are moderately susceptible and Discovery and Grenadier have very low susceptibility to mildew. …
P. leucotricha is an obligate parasite that overwinters on apple as mycelium in dormant buds infected during the previous growing season. Overwintering potential is limited primarily by temperature. In severe winters infected buds are killed as they are …
Apple leaves, blossoms and fruit can be affected. Primary blossom mildew This emerges at pink bud. Flowers are deformed with pale green or yellow petals and with petals and rosette leaves covered in white mycelium and spores. Primary vegetative mildew …
Mildew is always present in the orchard and routine control measures are usually needed from around green cluster until vegetative growth ceases. Monitoring mildew is essential to rationalise fungicide use and/or to check that control measures are …
This is based on removal of primary inoculum by pruning. In winter prune out silvered shoots. At pink bud and petal fall prune out primary blossom and primary vegetative mildew. This must be done rapidly to limit spread of inoculum. Where primary mildew …
Using estimates of secondary mildew to make decisions on disease control Mildew management based on assessments of secondary mildew was developed by Butt and Barlow. In order to make mildew management work it is important to understand apple mildew …
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