Post-symptom sprays of prohexadione-calcium affect fire blight infection of 'Gala' apple on susceptible or resistant rootstocks

James Rawlinson Schupp, D. A. Rosenberger, T. L. Robinson, H. Aldwinkle, J. Norelli, P. J. Porpiglia

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Three studies were conducted to evaluate the effect of post-infection sprays of prohexadione-calcium on the severity of naturally occurring fire blight infections on 3-and 4-year-old 'Gala' apple trees on blight-susceptible or blight-resistant rootstocks. Although post-infection prohexadione-calcium reduced the dry weight of fire blight strikes removed by pruning in one commercial orchard site, this treatment did not reduce mortality of young 'Gala' trees on M.9 or M.26 rootstocks, and did not reduce the incidence of scion or rootstock cankers on any of the rootstocks tested. We conclude that post-infection treatment with prohexadione-calcium is of no practical value in reducing fire blight symptoms on apple. Our results suggest that resistant apple rootstocks will be very valuable in increasing orchard survival in a fire blight epidemic.

Original languageEnglish (US)
Pages (from-to)903-905
Number of pages3
JournalHortScience
Volume37
Issue number6
StatePublished - Oct 1 2002

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Erwinia amylovora
signs and symptoms (plants)
rootstocks
apples
infection
blight
orchards
cankers (plants)
scions
pruning
prohexadione calcium
incidence

All Science Journal Classification (ASJC) codes

  • Horticulture

Cite this

Schupp, J. R., Rosenberger, D. A., Robinson, T. L., Aldwinkle, H., Norelli, J., & Porpiglia, P. J. (2002). Post-symptom sprays of prohexadione-calcium affect fire blight infection of 'Gala' apple on susceptible or resistant rootstocks. HortScience, 37(6), 903-905.
Schupp, James Rawlinson ; Rosenberger, D. A. ; Robinson, T. L. ; Aldwinkle, H. ; Norelli, J. ; Porpiglia, P. J. / Post-symptom sprays of prohexadione-calcium affect fire blight infection of 'Gala' apple on susceptible or resistant rootstocks. In: HortScience. 2002 ; Vol. 37, No. 6. pp. 903-905.
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Schupp, JR, Rosenberger, DA, Robinson, TL, Aldwinkle, H, Norelli, J & Porpiglia, PJ 2002, 'Post-symptom sprays of prohexadione-calcium affect fire blight infection of 'Gala' apple on susceptible or resistant rootstocks', HortScience, vol. 37, no. 6, pp. 903-905.

Post-symptom sprays of prohexadione-calcium affect fire blight infection of 'Gala' apple on susceptible or resistant rootstocks. / Schupp, James Rawlinson; Rosenberger, D. A.; Robinson, T. L.; Aldwinkle, H.; Norelli, J.; Porpiglia, P. J.

In: HortScience, Vol. 37, No. 6, 01.10.2002, p. 903-905.

Research output: Contribution to journalArticle

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Schupp JR, Rosenberger DA, Robinson TL, Aldwinkle H, Norelli J, Porpiglia PJ. Post-symptom sprays of prohexadione-calcium affect fire blight infection of 'Gala' apple on susceptible or resistant rootstocks. HortScience. 2002 Oct 1;37(6):903-905.