RONDO ® - Yellowtrap
Yellowtrap for monitoring of insect pests in oilseed rape

Each set contains one: 
Plastic grate

(Article-No: 207)

  The RONDO-Yellowtraps are produced by Temmen GmbH.
A minimum of 500 traps may be printed upon with an inscription of choice!! Plastic supports can be supplied.
The RONDO®-Yellowtrap alleviates the need for crop inspections as well as flying activity and seasonal flying peaks of the insect pests.

Mode of action:
Oilseed rape pests are attracted by the yellow colour of the trap's dish. This contains water into which the pests fall and are retained. They can then be counted. 

Preparation of the RONDO-Yellowtrap:
The dish is fixed to a plastic support (thickness: 2 cm; length 1,5 m) by means of a wedge (tapered end upside down). The dish is positioned in the centre of the wedge. Thanks to a conical shape the dish will be held in place. In case of a slick tube, fit a rubber ring before fixing the wedge. To protect beneficial insects (such as bumble-bees) cover the dish with the plastic grate. The dish can be correctly positioned at the height of the crop by moving it up or down the support.
Pour approx. 1 litre of water into the dish as well as few drops of dishwasher agent.

Evaluation of the trap:
Monitoring of the pests before flowering is essential. The traps need to be set up when the soil temperature reaches 5°C, which is around the beginning or middle of February. It is recommended to set up several RONDO -Yellowtraps per crop (depending on size of the field) between 2 to 4 per 20 ha about 10 meters from the crop's boundary. Assessing the trap should be done daily in the afternoon, preferably when the weather is sunny and mild.

The Rapestem weevil (Ceuthorynchus napi) and the Cabbage stem weevil (Ceuthorrhynchus quadridens) are important pests that may appear early in the season. Its larvae eat the stem and reduce the plant's water and nutrient supply as well as its stability. The damage enables fungi (Phoma) to penetrate the plant. In the case of the Rapestem weevil a loss of up to 50% of the harvest can be expected, in the case of the Cabbage stem weevil up to 20%.

The Rapestem weevil flies at 10-12 °C from last years to this year's rapeseed crop. After gorging into maturity for a few days the pest begins with the oviposition. It is therefore sensible to also set up traps on last year's rapeseed crop. An intermediate period of 2 weeks lies between eclosion of the weevil and the flying over to this year's rapeseed crop. In the case of quickly rising temperatures the intermediate period may not exist at all. The damage treshold is esceeded once more than 30 insects per dish are found within three days. In case of unsettled weather conditions the damage threshold is exceeded if more than 50 insects per trap are found over a length of time. The damage threshold for the most important pests can be found in the following chart. After the exceedance the pest must be fought against as quickly as possible to prevent eclosion

The Cabbage stem weevil enters winter oilseed rape at 12°C. There it remains for an estimated 10 days to fend off the bug after the initial appearance before the gorging into maturity begins. This may prove beneficial since at a rising temperature (beginning at 15 °C) the first wave of the Pollen beetle (Meligethes aeneus) may be affected as well. In some growing areas the weakening of agency has been observed in the pyrethroide used against the Pollen beetle. The changes are concerning since less and less insecticides containing different active ingredients are available. This means that careful appliction as well as adherence to the priciple of damage threshold is becoming more important to avoid unnecessary and ineffective treatment.
Damage thresholds in rapeseed

Rapestem weevil  (Ceuthorrhynchus napi)

- more than 30 bugs per RONDO-Yellowtrap in three days on last years rapeseed crop
- more than 10 bugs per Rondo- Yellowtrap in three days in rapeseed crop in february/march

Apply insecticide as soon as reaching the threshhold. If a grate for protection against bumble-bees and bees is used a application at 5 bugs per dish is recommended.

Cabbage Stem weevil (Ceuthorrhynchus quadridens)

-more than 30 weevils per RONDO-Yellotrap in three consecative days in March/April; Apply insecticides ca. 10 – 14 days after first appearance. If grates for protection against bumble-bees and bees and other beneficial insects are used an application at 15 weevils per dish is recommended.

Pollen beetle  (Meligethes aeneus)

- 1-2 beetles per plant in EC 50 (buds still covered by upper leaves)

- 3-4 beetles per plant appr. 14 days before flowering

- more than 5 bugs per plant shortly before flowering the Rondo-Yellowtrap is used to monitor the flying in of the pests.


Cabbage seed weevil (Ceuthorrhynchus assimilis)

- 1 weevil per plant during flowering with low appearence of the Cabbage seed weevil

- yellow traps are used to monitor the flying in of the pests.


Brassica pod midge (Dasiyneura brassicae)

- 1 midge per 3-4 plants during flowering

Cabbage stem flea beetle
- 50 bugs per RONDO-Yellow trap in 3 weeks
Article No  Article Amount EURO (net)
207  RONDO 1 Set On request
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