Disease status Other hosts Varietal susceptibility Distribution Symptoms and recognition Other rots that may be confused with Phytophthora rot Disease cycle and epidemiology Disease monitoring and forecasting Procedures for assessment of risk of …
Phytophthora The characteristic symptoms are a firm rot, mid-dark brown in colour and often marbled or blotchy The life cycle and epidemiology of this soil-borne fungus involves survival in the soil as resting spores (zoospores). These germinate in wet …
Overwintered eggs on the bark of apple trees hatch in April, rather later than those of the apple grass aphid or the rosy apple aphid. The nymphs feed on the undersides of the leaves mainly in the tips of young shoots. Winged aphids develop in June and …
Green apple aphid is a common but minor pest of apple which also attacks pear. It is most important on young trees. …
All apple varieties are susceptible to infestation by the aphid. …
The severity of infestation by green apple aphid should be determined in each orchard when pest assessments are done from late June to the end of August. Examine the growing shoots (preferably all, but examining two shoots per tree carefully) in at least …
Spring attacks are unimportant. Large colonies may develop in the shoots in summer, causing considerable leaf curl, stunting and shoot tips may be killed. This damage is important on nursery stock and young trees. In established orchards, infestation of …
Egg Shiny black and found on the bark of apple trees on rough bark round buds. Adult Bright or yellowish green. Honey tubes (siphunculi) moderately long (about the same length as the distance between their bases), black or dark brown. Cauda (‘tail’) …
Niab
Park Farm Campus
Villa Road
Histon
Cambridge
CB24 9AT, UK
Tel: +44(0)1223 342200
Email: [email protected]
