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| Monitoring Results |
Update following the FRAC-AP meeting held on December 1st, 2009. The current sensitivity status of Botrytis on vines and strawberries and of Venturia on apple was discussed.
Botrytis
Vineyards:
Sensitivity monitoring was carried out in Austria, France, Spain, Portugal, and Germany in commercial vineyards. Available data to date (2009), show that the frequency of resistant isolates continues to remain low.
Products, applied according to the FRAC-AP guidelines in grape spray programmes, maintained very good performance in the field.
Strawberries:
Sensitivity monitoring was carried out in Austria, Germany, Poland, UK and Spain from commercial locations. Data from 2009 show that the frequency of resistant isolates is variable, fluctuating from field to field,
ranging from zero to high.
Products, applied according to the FRAC-AP guidelines in strawberry spray programmes, provided good control in most commercial situations.
Evidence from field and laboratory trials has shown that there is a medium resistance risk of Botrytis to APs. The fact that resistant isolates can be found in commercial sites, albeit at low levels, reinforces the importance of strict adherence to the FRAC-AP guidelines to control Botrytis.
Venturia:
Monitoring carried out in Europe during 2009 did not show any further spread and increase in frequency of resistance detected compared to 2008.
Evidence from previous field and laboratory trials has shown that there is a medium resistance risk of Venturia to APs. The fact that resistant isolates can be found in commercial orchards reinforces the importance of strict adherence to the FRAC-AP guidelines to control Venturia.
In 2009, AP-containing spray programmes continued to show good performance in commercial orchards.
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| General Guidelines |
The guidelines for the use of AP fungicides against Botrytis grey mould were not changed on account of the stable situation recorded in the monitoring studies.
The Venturia guidelines have not been changed.
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| Use Guidelines for AP-Containing Products |
The purpose of the use guidelines for AP containing products is to maintain the sensitivity in the target pathogens and to prevent crop losses due to resistant pathogen populations.
Where different AP-containing products are used in one season, the cumulative number of applications with cyprodinil-, pyrimethanil- or mepanipyrim-containing products must not exceed the maxima as mentioned below.
The guidelines were reviewed during the meeting on December 1st, 2009.
Botrytis Guidelines
Where two treatments are made per season, the number of applications of AP-containing products is limited to one.
In situations where up to six Botrytis treatments are made per crop and season, a maximum of two applications with AP-containing products are recommended.
In specific situations where seven or more Botrytis treatments are required per crop and season, a maximum of three applications with AP-containing products is recommended.
For specific crops and products, follow use recommendations of individual companies.
Venturia Guidelines
Apply a maximum of four AP-containing products per season.
In locations where resistance has been reported, use APs only in mixture with an effective scab fungicide.
Individual products should always be used at recommended dose rates and during the period when they are most effective.
Curative use only in conjunction with reliable scab warning systems.
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| Communication
plan |
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Recommended methods for AP fungicide sensitivity testing are available on the FRAC web site.
- The next FRAC AP WG Meeting is scheduled for November 30, 2010.
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| Monitoring Results and Use Recommendations |
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| Contact |
For further information on the Anilinopyrimidines Working Group contact:
Ms. Hélène Lachaise,
Chairwoman,
FRAC-AP Working Group,
Bayer CropScience,
14-20, rue Pierre Baizet,
69263, Lyon, France,
Tel N°: 00 33 4 72 85 22 45,
Fax N°: 00 33 4 72 85 24 00
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