Control of Alternaria alternata, Causal Agent of Dead (Dormant) Flower Bud Disease of Pear

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 (P.s.s.) are mentioned as likely causes of dead flower buds. Pseudomonas syringae pv. syringae was occasionally isolated from diseased flower buds. However, Alternaria alternata was nearly always isolated from diseased buds and also often in symptomless flower buds. By identifying the causal agent of dead flower buds disease, an effective control strategy can be developed. In field trials it was proven that fungicide treatments can reduce disease incidences significantly

Disinfection of potato ringrot in practice

Success story of the Euphresco project 'The effects of disinfection on Clavibacter michiganensis subsp. sepedonicus and other bacterial pathogens of potato in Europe

Alternaria alternata, causal agent of dead (dormant) flower bud disease of pear

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

Alternaria alternata, causal agent of dead (dormant) flower bud disease of pear

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

Control of Alternaria alternata, Causal Agent of Dead (Dormant) Flower Bud Disease of Pear

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 (P.s.s.) are mentioned as likely causes of dead flower buds. Pseudomonas syringae pv. syringae was occasionally isolated from diseased flower buds. However, Alternaria alternata was nearly always isolated from diseased buds and also often in symptomless flower buds. By identifying the causal agent of dead flower buds disease, an effective control strategy can be developed. In field trials it was proven that fungicide treatments can reduce disease incidences significantly

Dode knoppen bij peer: Alternaria als veroorzaker?

PPO-fruit startte in 2002 een meerjarig onderzoek naar de oorzaak en bestrijding van dode bloemknoppen bij peer. De eerste resultaten worden hier uitgelicht. Gegevens in bijgaande tabellen: 1) Gemiddeld aantal vruchten en kilogramopbrengst per boom in 2002 voor verschillende behandelingen; 2) Gemiddeld aantal knoppen per boom in 2003 voor verschillende behandelingen; 3) Percentage dode knoppen in voorjaar 2003 voor verschillende behandelingen; 4) Percentage dode knoppen per besmettingsmethod

Dode knoppen bij peer: Alternaria als veroorzaker?

PPO-fruit startte in 2002 een meerjarig onderzoek naar de oorzaak en bestrijding van dode bloemknoppen bij peer. De eerste resultaten worden hier uitgelicht. Gegevens in bijgaande tabellen: 1) Gemiddeld aantal vruchten en kilogramopbrengst per boom in 2002 voor verschillende behandelingen; 2) Gemiddeld aantal knoppen per boom in 2003 voor verschillende behandelingen; 3) Percentage dode knoppen in voorjaar 2003 voor verschillende behandelingen; 4) Percentage dode knoppen per besmettingsmethod