Barley Barley Crop Icon Brassicas Brassicas Crop Icon Sugar Beet Sugar Beet Carrots Carrots Icon Leeks Leek Icon Maize Maize Icon Oilseed Oilseed Icon Onions Onions Icon Other Cereals Other Cereals Icon O R T Peas And Beans Peas and beans Icon Potatoes Potatoes Icon Salad Crops Salad Crops Icon Soft Fruits Crops Soft Fruits Icon Top Fruits Crops Top Fruits Icon Wheat Crops Wheat Icon Calendar Calendar icon

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

Integrated Pest Management

Spring/Autumn oilseed rape

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


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

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.