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Pollen Beetle Predictor

The pollen beetle forecast identifies the start of the migration and the main period of infection risk for both winter and spring oilseed rape.

The Bayer Pollen Beetle Predictor forecasts the start, peaks and progress of pollen beetle migration into OSR crops, supporting you in identifying when it’s time to check your crops, or not.

Utilising the Bayer Pollen Beetle Predictor could help reduce monitoring times, focus your efforts on monitoring when it’s needed most, avoid unnecessary spraying and optimise spray timing.

See below for the Bayer Pollen Beetle Predictor, as well as a helpful guide in how to interpret the tool.

The pollen beetle predictor is best viewed on a tablet or desktop.

How to use the Bayer Pollen Beetle Predictor

Pollen beetle pdf

IPM - Winter OSR

When Bayer Pollen Beetle Predictor shows conditions suitable for migration it’s time to visit fields to monitor pollen beetle populations (average number of beetles per plant). Compare findings with the revised HGCA recommended control thresholds to decide whether or not treatment is required.

These thresholds are based on plant population densities and have been developed from new understanding of the maximum number of buds a pollen beetle can destroy and the number of excess flowers produced by plants in varying populations. HGCA research showed that low population crops have more excess flowers, which can be sacrificed without yield loss, while high population crops have fewer.

Revised thresholds for winter and spring oilseed rape are: (Source: HGCA Information Sheet 18/Spring 2013 ‘Monitoring and control of pollen beetle in oilseed rape’)

Plant population per m2 Pollen beetle per plant
<30 25
30-50 18
50-70 11
>70 7

If numbers exceed thresholds, treatment with Biscaya will control even the most resistant pollen beetles. In recent trials yield responses from Biscaya have outperformed competitor treatments and ranged from 6.5% (under low beetle pressure) to 12.5% (under high beetle pressure) over untreated.

Flowering is rarely even across a field. Usually, by the time thresholds are breached some plants will have begun flowering but the field will not yet be flowering in earnest. Product choice is then limited (see diagram below) but there is still significant risk of crop damage.

A big practical advantage with Biscaya is that it can be used right up to the end of the damage susceptible period which is when around three quarters of the plants in a field have 20% of their flowers open. The latest time of application for most other treatments is GS59 yellow bud.

 

Pollen Beetle application: Latest times of application

diagram

Integrated Pest Management checklist – Winter oilseed rape

  1. Know your plant populations
  2. Monitor pollen beetle migration with Bayer Pollen Beetle Predictor
  3. When it indicates risk, assess beetle populations
  4. If thresholds are breached, apply Biscaya at 0.3 L/ha
  5. DO NOT apply insurance sprays
Next

IPM - Spring OSR

Pollen beetle can be far more damaging to spring crops than to winter OSR. This is because pollen beetles move into spring OSR fast and in large numbers from winter crops when they have finished flowering and become unattractive to them.

This movement is often just prior to flowering of spring crops in late April and into May. Populations of 50 or more beetles per plant are possible and warrant prompt treatment to protect yield potential.

 

Spring OSR

Pollen beetle traps have been developed from recent HGCA research and are now commercially available from Oecos. These have value in detecting local movement into crops.  The traps are more attractive to pollen beetles than OSR plants so beetles will be found on traps before they are found in crops.

Researchers have not yet been able to calibrate trap catches with crop numbers, so they are a useful indicator of when it’s time to get into fields and monitor but are not an alternative to monitoring.

Revised thresholds for winter and spring oilseed rape are: (Source: HGCA Information Sheet 18/Spring 2013 ‘Monitoring and control of pollen beetle in oilseed rape’)

Plant population per m2 Pollen beetle per plant
<30 25
30-50 18
50-70 11
>70 7

Pollen beetle resistance to pyrethroid insecticides is now widespread, so if you need to control pollen beetle there’s a high risk that a pyrethroid will not be effective.

Biscaya will control even the most resistant pollen beetles. In recent trials yield responses from Biscaya have outperformed competitor treatments and ranged from 6.5% (under low beetle pressure) to 12.5% (under high beetle pressure) over untreated.

Integrated Pest Management checklist – Spring oilseed rape

  1. Know your plant populations
  2. Monitor movement into crops with Oecos traps
  3. Assess beetle populations in crops
  4. If thresholds are breached, apply Biscaya at 0.3 L/ha
  5. DO NOT apply insurance sprays
Next

Bayer Pollen Beetle Predictor is a version of the proPlant tool used widely in Europe. It was validated for the UK by HGCA project RD-2007-3394; ‘Development of an IPM strategy for control of pollen beetles in winter OSR’.  Completed in March 2012 this four-year project was led by Dr Sam Cook at Rothamsted Research and jointly funded by Defra-LINK, HSE-CRD and AHDB-HGCA.

Although all risk predictions and forecasts published by proPlant and Bayer CropScience Limited are provided to you in good faith, their accuracy cannot be guaranteed and they are NOT a substitute for rigorous field walking in combination with advice from BASIS qualified persons. Therefore you assume sole responsibility for any results obtained from the use of the Bayer Pollen Beetle Predictor and any decisions taken or conclusions drawn from such use. proPlant GmbH, Bayer CropScience Limited and members of their respective groups accept no liability for any loss or damage resulting from the use of the Bayer Pollen Beetle Predictor.