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231225s2001 xx |||||o 00| ||eng c |
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|a 10.1094/PDIS.2001.85.8.895
|2 doi
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|a eng
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| 100 |
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|a Wu, B M
|e verfasserin
|4 aut
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|a Comparison of Three Fungicide Spray Advisories for Lettuce Downy Mildew
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|c 2001
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 20.11.2019
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Lettuce growers in coastal California have relied mainly on protective fungicide sprays to control downy mildew. Thus, timing of sprays before infection is critical for optimal results. A leaf-wetness-driven, infection-based advisory system, previously developed, did not always perform satisfactorily. In this study, the advisory system was modified by incorporating a pathogen survival component (system 1) or both survival and sporulation components (system 2). These systems were then evaluated in commercial lettuce fields in coastal California during 1996-1998. Three or four treatments were carried out in each field: (i) no spray; (ii) sprays as scheduled by the growers; (iii) sprays following modified system 1; and (iv) sprays following the original advisory system (1996) or modified system 2 (1998). Downy mildew incidence was evaluated every 2 to 9 days. In fields with drip irrigation, the number of fungicide applications was reduced by one or two regardless of the advisory system used compared to the grower's calendar-based schedule, although one unnecessary spray was recommended in 1996 at Soledad and 1997 at Salinas. Under all three systems, disease levels were low (incidence <25% and about 1 lesion per plant) for fields with drip irrigation, but not for fields with sprinklers (incidence up to 100% and 5 to 10 lesions per plant). For the first time, we established that survival and sporulation components are not needed for a lettuce downy mildew forecasting system. Instead, a threshold with a shorter period of morning leaf wetness and high temperatures were found to have potential for improving forecasting efficiency
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|a Journal Article
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|a weather
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1 |
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|a Subbarao, K V
|e verfasserin
|4 aut
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1 |
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|a van Bruggen, A H C
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Koike, S T
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Plant disease
|d 1997
|g 85(2001), 8 vom: 01. Aug., Seite 895-900
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|g volume:85
|g year:2001
|g number:8
|g day:01
|g month:08
|g pages:895-900
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|u http://dx.doi.org/10.1094/PDIS.2001.85.8.895
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