Efficacy of Coniothyrium minitans on lettuce drop caused by Sclerotinia minor in desert agroecosystem

P. Chitrampalam, C. A. Cox, T. A. Turini, B. M. Pryor

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Field experiments were conducted over 2years in Yuma County, Arizona and Imperial County, California, to evaluate if increased application rates of a commercial formulation of Coniothyrium minitans (Contans) were effective against lettuce drop caused by Sclerotinia minor. The efficacy of C. minitans at varied application rates were compared to two field isolates of Paenibacillus polymyxa and the chemical fungicide Boscolid (Endura). Two applications of manufacture recommended rate of Contans (2.2kg/ha) did not significantly reduce the incidence of lettuce drop caused by S. minor, even though applications at this rate have been shown to be very effective in controlling lettuce drop caused by Sclerotinia sclerotiorum. However, two applications of high rates of Contans (6.6, 8.8, or 11kg/ha), one at planting and one at post-thinning, significantly reduced the incidence of lettuce drop in most trials. Two isolates of P. polymyxa each applied at a rate of 9.4L/ha (109cfu/ml) were not effective in reducing the incidence of lettuce drop. Two applications of Endura, one at thinning and one at 4weeks post-thinning, significantly reduced the incidence of lettuce drop in Yuma County, AZ, but not in Imperial County, CA. In summary, successful management of lettuce drop caused by S. minor in desert ecosystem could best be achieved with high application rates of C. minitans.

Original languageEnglish (US)
Pages (from-to)92-96
Number of pages5
JournalBiological Control
Volume55
Issue number2
DOIs
StatePublished - Nov 1 2010

Keywords

  • Biological control
  • Boscolid
  • Coniothyrium minitans
  • Fungicide
  • Lettuce drop
  • Paenibacillus polymyxa
  • Sclerotinia minor

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Insect Science

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