Effects of growing season and fungicide type on the development of Alternaria solani and on potato yield

D. Shtienberg*, D. Blachinsky, G. Ben-Hador, A. Dinoor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The intensity of early blight disease caused by Alternaria solani and its effects on yield were evaluated in potato crops in the autumn (four experiments), winter (one experiment), and spring (five experiments) growing seasons in Israel. Analysis of disease progress curves revealed that early blight is more important in the autumn and winter than in the spring in the northern Negev region of Israel. Similarly, differences in yield between fungicide-treated and nontreated plots were significant (P < 0.05) in four of the five autumn and winter experiments (20.6 to 24.0% increase) but in none of the spring experiments. In the autumn and winter seasons, early blight did not affect numbers of tubers produced per unit area but reduced tuber weight. The efficacy of the systemic fungicides tebuconazole and difenoconazole against A. solani was compared with that of the common protectant fungicides chlorothalonil and mancozeb. Tebuconazole significantly decreased lesion expansion rate and chlorothalonil did not. In some of the autumn and winter experiments, but in none of the spring experiments, the systemic fungicides were significantly more effective than the protectants in suppression of A. solani.

Original languageEnglish
Pages (from-to)994-998
Number of pages5
JournalPlant Disease
Volume80
Issue number9
DOIs
StatePublished - Sep 1996

Keywords

  • Solanum tuberosum
  • yield loss assessment

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