Dead (dormant) flower buds of pear are an important phenomenon in pear production in the Netherlands. Vigourous or unbalanced tree growth and Pseudomonas syringae pv. syringae are mentioned as likely causes of dead flower buds. Several tree growth control treatments including ethephon, Regalis (Prohexadione-Ca) and root pruning were evaluated. Regalis increased disease incidence. The plant stimulant (foliar fertilizer) Resistim (potassium phosphonate) reduced disease incidence. Pseudomonas syringae pv. syringae was occasionally isolated from diseased flower buds. However, Alternaria alternata was nearly always isolated from diseased buds. Pathogenicity of isolated A. alternaria was proven on detached dormant flower buds. By identifying the causal agent of dead flower buds disease, an effective control strategy can be developed.
|Title of host publication||Proceedings of the meetings at Lindau, Germany, 31 August - 03 September, 2005|
|Publication status||Published - 2006|
|Event||Working Group "Integrated Protection of Fruit Crops, sub group "Pome Fruit Diseases" - |
Duration: 31 Aug 2005 → 3 Sep 2005
|Conference||Working Group "Integrated Protection of Fruit Crops, sub group "Pome Fruit Diseases"|
|Period||31/08/05 → 3/09/05|