Timing the application of fungicides to control potato early blight (Alternaria Solani) In multi-location field trials In Denmark

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Bernadette Bryant
5 years ago
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1 Timing the appliation of fungiides to ontrol potato early blight (Alternaria Solani) In multi-loation field trials In Denmark

2 Content Overview of early blight in Denmark Objetives of the study Materials & Method Model desription Treatments Experimental design Results Conlusions

3 Overview of early blight in DK 0.4 RDPC Previous Crop Maize Spring Barley Sugar Cane Tritiale Winter Barley Winter Wheat Year

4 Objetives To evaluate different models to ontrol early blight ompared a standard pratie in multi-loation field trials in Denmark. Should the models perform well in all trial sites, we an reommend the models for use by farmers aross Denmark.

5 Age-related suseptibility zzzssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss Similar model in Shtienberg (2014) Pdays

6 TOMCAST, DSV A weather-based model Calulates EB risk as daily severity values (DSV) DSV is a determined by the interation between Duration of leaf wetness and Temperature Average temp( C) during LW hours Leaf Wetness per Day(h) DSV= Madden et al.,

7 Treatments Treatment Untreated Standard Fungiide appliation Shedule No fungiide appliation 4x 0.25kgha -1 Signum (full dose) from 7WAE, 14 days interval First symptoms 4x 0.25kgha -1 Signum from % symptoms, 14 days interval Late appliation 4x 0.25kgha -1 Signum 14 days after first symptoms, 14 days interval Maturity-based Model I TOMCAST 330P-days: ½ of 0.25kgha days interval, 500-Pdays: Full dose at 14 days interval 330 P-days: 1 full dose Signum, Subsequent spray: 20 full dose dose TOMCAST+Maturity-Based Model 1 st Spray: 330 P-days + 25 DSV sine emergene. 3/4 th of 0.25kgha -1 Signum: DSV Pdays <500, 0.25kgha -1 Signum: DSV 25 + Pdays >500 Subsequent appliation is based on aumulation of 20 DSV

8 Experimental plan 3 field experiments Flakkebjerg Late blight (artifiial ontrol with inoulation with 0.5lha -1 A. solani & A. Ranman Top alternata) Sunds Natural infetion Billund Variety: Kuras Design: RCBD

9 Results-Flakkebjerg, 2016 A B DPC a Effiieny (%) d b b a b first symptoms Late Appliation Maturity Model Modified Tomast Standard Tomast+Maturity Model Untreated 0 first symptoms Late Appliation Maturity Model Modified Tomast Standard Tomast+M Treatment Treatment

10 A 2000 Results-Billund, 2016 B 50 DPC b first symptoms Late Appliation Maturity-Based model Modified TOMCAST Standard a Effiieny (%) TOMCAST+Maturity-Based model Untreated a a a b b b first symptoms Late Appliation Maturity-Based model Modified TOMCAST Standard TOMCAST Treatment Treatment

11 A 300 Results-Sunds, 2016 B 50 DPC b first symptoms Late Appliation Maturity-Based Model Modified TOMCAST Standard a Effiieny (%) TOMCAST + Maturity-Based Model Untreated b b d first symptoms Late Appliation Maturity-Based Model Modified TOMCAST Standard a TOMCAST Treatment Treatment

12 Starh yield (hkg/ha) Billund Flakkebjerg 150 Starh yield (hkg/ha) Sunds ab ab a a ab a First symptoms Late appliation Maturity-based model Modifed-TOMCAST Standard appliation b TOMCAST+Maturity-based Model Untreated First symptoms Late appliation Maturity-based model Modifed-TOMCAST Standard appliation TOMCAST+Maturity-based Model Untreated Treatments

13 Conlusion Starting fungiide appliation at the onset of first attak an provide suffiient early blight ontrol omparable to standard pratie. Starting the appliation of fungiide 14 days after the onset of symptoms may be too late and thus loss of disease ontrol. The Maturity-based model, Modified-TOMCAST and ombining TOMCAST and Maturity-based model to offer the best ontrol for early blight without yield penalties.

14 Conlusion (ont d) The effetive early blight ontrol obtained from the Maturity-based model, Modified TOMCAST and TOMCAST+Maturity-based model at all the loations suggest the appliability of suh models in pratie.

15 Aknowledgements KAF for funding SEGES Kaspar Ingvordsen Hans Henning Hansen.and speial thanks to you for your attention

Funding: MPIC/Agrochemical Industry USDA/ARS

Funding: MPIC/Agrochemical Industry USDA/ARS Evaluation and omparison of iofungiides and fungiides for the ontrol of post harvest potato tuer diseases. E. Gahango, W. W. Kirk, P. S. Wharton, R. Shafer and P. Tumalam. Department of Plant Pathology,