Factors affecting the development and management of Septoria leaf spot of pistachio in Arizona

Michael E Matheron, Robert E. Call

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

In 1964, Septoria leaf spot was detected for the first time in the United States in experimental pistachio (Pistacia vera) plantings at Brownwood, Texas. A moderate level of the same disease, caused by the fungus Septoria pistaciarum, was first observed in 1986 on leaves of pistachio trees in Arizona. In 1988 a survey of the 800 ha of pistachio orchards in southeastern Arizona revealed a widespread incidence of the disease. Since the initial discovery and identification of the disease, Septoria leaf spot has appeared every year in Arizona pistachio orchards. The onset and severity of the disease is affected by summer rainfall that occurs in this region. Yearly disease management studies conducted since 1992 have shown that as few as two applications of chlorothalonil in July and August can virtually prevent disease development. Applications of copper hydroxide or benomyl alone or in combination also effectively arrested disease development. Leaves around nut clusters not receiving fungicide treatments were senescent at crop maturity, while leaves on treated trees showed no sign of senescence. Pistachio trees infected with Septoria leaf spot and not treated with a fungicide can defoliate in the autumn up to 2 months prematurely.

Original languageEnglish (US)
Title of host publicationActa Horticulturae
Pages592-595
Number of pages4
Volume470
StatePublished - 1998

Publication series

NameActa Horticulturae
Volume470
ISSN (Print)05677572

Fingerprint

leaf spot
Septoria
pistachios
fungicides
orchards
copper hydroxide
Pistacia vera
leaves
chlorothalonil
benomyl
nuts
disease incidence
disease severity
disease control
planting
autumn
rain
fungi
summer
crops

Keywords

  • Pistacia vera
  • Septoria pistaciarum

ASJC Scopus subject areas

  • Horticulture

Cite this

Matheron, M. E., & Call, R. E. (1998). Factors affecting the development and management of Septoria leaf spot of pistachio in Arizona. In Acta Horticulturae (Vol. 470, pp. 592-595). (Acta Horticulturae; Vol. 470).

Factors affecting the development and management of Septoria leaf spot of pistachio in Arizona. / Matheron, Michael E; Call, Robert E.

Acta Horticulturae. Vol. 470 1998. p. 592-595 (Acta Horticulturae; Vol. 470).

Research output: Chapter in Book/Report/Conference proceedingChapter

Matheron, ME & Call, RE 1998, Factors affecting the development and management of Septoria leaf spot of pistachio in Arizona. in Acta Horticulturae. vol. 470, Acta Horticulturae, vol. 470, pp. 592-595.
Matheron ME, Call RE. Factors affecting the development and management of Septoria leaf spot of pistachio in Arizona. In Acta Horticulturae. Vol. 470. 1998. p. 592-595. (Acta Horticulturae).
Matheron, Michael E ; Call, Robert E. / Factors affecting the development and management of Septoria leaf spot of pistachio in Arizona. Acta Horticulturae. Vol. 470 1998. pp. 592-595 (Acta Horticulturae).
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