Late Blight Control – Date and Product Strategy Must be Correct!

Late Blight Control – Date and Product Strategy Must be Correct!

Germany, Bavaria; Bayerische Landesanstalt für Landwirtschaft

Institut für Pflanzenschutz; authors: Michael Zellner, Steffen Wagner, Bernhard Weber, Johann Hofbauer http://www.lfl.bayern.de/ips/landwirtschaft/12990/

 

This article (in English) provides very useful information and tables about the essentials in late blight control concerning the choice of product and the timing of the application. Tables of different fungicides, dates of application, a comparison of systemic and local fungicides are included. It explains the conditions for infestation, the function and modes of action of the fungicides. A selection of fungicides for first and later treatments is provided as well as optimum treatment frequency, dosage and prices.

Fight against blight: independent blight fungicide trials summary – years 2003 to 2005

report-fight-against-blight-independant-blight-fungicide-trials-2003-2005-summary

This report presents independently generated data on the effectiveness and technical attributes of blight fungicides.

The BPC commissioned ADAS & SAC to carry out field trials in 2003, 2004 & 2005, located at ADAS Rosemaund and SAC Auchincruive. Only two trials were carried out at each site in each year. The P. infestans isolates used were all recent isolates at the time from the UK. All trials were carried out on small plots of the variety King Edward. To make comparisons of all possible combinations would be prohibitively expensive therefore the work reported concentrated on two protocols:

Early season fungicides (Protocol 1): Evaluation of fungicides applied very early in the development of the crop.  Two new fungicides at the time, Sonata and Tanos, were compared with three established fungicides often used at the start of programmes, Dithane NT, Invader and Shirlan.

Main season fungicide evaluation (Protocol 2): The performance of fungicides applied from the end of rapid canopy growth was compared because most of the new fungicides are recommended for this growth phase of the crop. In addition, this would allow their effectiveness in controlling tuber blight to be evaluated. The new fungicides Electis, Ranman TP and Sonata, were compared with the established products, Curzate M, Invader and Shirlan.

The fungicides tested gave a similar level of foliar blight control. The trials provided strong data for the relative fungicide efficacies against tuber blight.