A Fungicide Application Decision (FAD) Support System for Postbloom Fruit Drop of Citrus (PFD)

  • Peres N
  • Kim S
  • Beck H
  • et al.
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Abstract

Surveys were conducted to identify fungi associated with postemergence cotton seedling disease in Missouri. Samples consisted of 10 cotton seedlings, 2 to 3 weeks after emergence, with symptoms of seedling diseases collected from a 0.25 ha area in each of 60 fields in 1997 and 1998. Four genera of fungi were cultured from the roots (Fusarium, Pythium, Rhizoctonia, and Thielaviopsis) and three species were identified: Rhizoctonia solani, Thielaviopsis basicola, and Pythiumultimum. Rhizoctonia solani, T. basicola, and P. ultimum were cultured from seedlings in 70%, 47%, and 15% of fields sampled in 1997, respectively, and 55%, 17%, and 5% of fields sampled in 1998, respectively. Repeated tests of pathogenicity confirmed that R. solani AG-4, T. basicola, and P. ultimum were major causal agents of postemergence cotton seedling disease in Missouri. This study provides the first documentation on the distribution and frequency of fungi associated with postemergence seedling disease complex of cotton based on a survey of randomly selected fields.Accepted for publication 10 July 2002. Published 31 July 2002.PFD is a serious problem in most citrus production areas of the Americas. Because a predictive model previously developed in Florida to time fungicide applications was inadequate for use in many other regions, an expert system (PFD-FAD) with broader applicability was developed and implemented in a web-accessible Java Servlet. Cost savings with the use of PFD-FAD were assessed.

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Peres, N. A. R., Kim, S., Beck, H. W., Souza, N. L., & Timmer, L. W. (2002). A Fungicide Application Decision (FAD) Support System for Postbloom Fruit Drop of Citrus (PFD). Plant Health Progress, 3(1). https://doi.org/10.1094/php-2002-0731-01-rv

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