There is considerable research in other countries on biological agents for control of fireblight. Four products are commercially available in the USA: Pseudomonas fluorescens strain A506 (Blight Ban) Pantoea agglomerans E325 (Bloomtime Biological FD) …
In other countries where fireblight is prevalent, preventative sprays of copper or antibiotics are applied during high risk periods, generally in bloom. Copper compounds are phytotoxic and none are recommended for use on apples after bud burst. The use of …
Prohexadione-calcium (Regalis Plus) This is a growth regulator that reduces shoot growth on apples by inhibiting gibberellin biosynthesis. When used on apple to control shoot growth it also reduces the incidence and severity of fireblight shoot …
Products containing harpin (PreTect, ProAct, Messenger) have various effects on plants improving the quality of fruit. They also stimulate the defense system of the plant and increase resistance to disease. Such treatments need to be applied pre-bloom to …
Disease status Hosts Symptoms and recognition Disease cycle and epidemiology Factors which enhance the risk of fireblight Disease monitoring and forecasting Prevention and control of fireblight Biological control Chemical control Other chemical control …
There are no recommended chemical control measures and so cultural control measures are equally applicable to organic production and conventional systems. However, the growth regulator Regalis Plus (prohexadione-calcium) used to control shoot growth can …
Fireblight is usually associated with pears but it can cause significant losses on certain susceptible apple varieties notably Gala and Egremont Russet, and on late flowering cider apple varieties Vilberie and Brown Snout. Young apple trees are …
Silver leaf is a wood rotting disease that frequently attacks apple trees and may cause death of trees or tree parts. It is usually most common on older trees particularly those that have been top worked or with large pruning …
Silver leaf has a wide host range. The disease is more serious on plums and cherries, but also attacks pears and other members of Rosaceae including peach, apricot, nectarine, almond, hawthorn, blackthorn, rose and Portuguese laurel. Many other woody …
Apple varieties most frequently attacked are Newton Wonder and Early Victoria, but all apple varieties are susceptible. …
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