Prohexadione-calcium is an acylcyclohexanedione that reduces incidence of fi re blight, caused by Erwinia amylovora. To determine whether prohexadione-calcium can be used in conjunction with biological control agents, its effect on the secretion and composition of nectar from apple and pear fl owers was evaluated. Plants treated with prohexadione-calcium produced more nectar, but the sugar concentration of the nectar was lower. The ability of E. amylovora, and of two biological control agents of fi re blight, Pantoea agglomerans and Pseudomonas fl uorescens, to grow in a sugar solution corresponding to the composition of nectar from treated or untreated plants was determined in the laboratory. All bacteria including E. amylovora grew better in the sugar solution corresponding to the nectar from treated plants. The concentration of sugar in the non-treated fl owers may be too high for bacterial growth. These results also suggest that prohexadione-calcium can be used alongside biological control agents for reduction of fi re blight incidence.
EFFECT OF PROHEXADIONE-CALCIUM ON NECTAR COMPOSITION OF POMACEOUS FLOWERS AND ON BACTERIAL GROWTH / F. SPINELLI; J.L. VANNESTE; G.L. MARCAZZAN; A.G. SABATINI; G. COSTA. - In: NEW ZEALAND PLANT PROTECTION. - ISSN 1175-9003. - STAMPA. - 58:(2005), pp. 106-111. (Intervento presentato al convegno Proceedings of the Annual Conference of the New Zealand Plant Protection Society tenutosi a Wellington, New Zealand nel 9-11 August 2005).
EFFECT OF PROHEXADIONE-CALCIUM ON NECTAR COMPOSITION OF POMACEOUS FLOWERS AND ON BACTERIAL GROWTH
SPINELLI, FRANCESCO;COSTA, GUGLIELMO
2005
Abstract
Prohexadione-calcium is an acylcyclohexanedione that reduces incidence of fi re blight, caused by Erwinia amylovora. To determine whether prohexadione-calcium can be used in conjunction with biological control agents, its effect on the secretion and composition of nectar from apple and pear fl owers was evaluated. Plants treated with prohexadione-calcium produced more nectar, but the sugar concentration of the nectar was lower. The ability of E. amylovora, and of two biological control agents of fi re blight, Pantoea agglomerans and Pseudomonas fl uorescens, to grow in a sugar solution corresponding to the composition of nectar from treated or untreated plants was determined in the laboratory. All bacteria including E. amylovora grew better in the sugar solution corresponding to the nectar from treated plants. The concentration of sugar in the non-treated fl owers may be too high for bacterial growth. These results also suggest that prohexadione-calcium can be used alongside biological control agents for reduction of fi re blight incidence.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
