BIOCARE is a certified member of the International Biocontrol Manufacturers Association


Monitoring of Ostrinia nubilalis

The right moment to spread TRICHOSAFE® depends only on the arrival of Ostrinia nubilalis and it is essential to ensure effectiveness of Trichogramma. The beginning of the period when the Ostrinia nubilalis is laying its eggs is established by the sum of the temperatures from the beginning of the year. Therefore it is completely independent from the maize development stage. In order to establish the arrival of Ostrinia nubilalis it is possible to use light traps and pheromone traps as soon as the expected sum of the temperatures is reached.

In order to be able to establish the right time for spreading the product for each region, monitoring of various light and pheromone traps is conducted by official advisory bodies in cooperation with farmers. Relevant information is available at, while for the Federal State of Hesse – at If there are insufficient traps in your region or you wish to conduct your own monitoring, please contact the official service or us to obtain more information.

FAQ regarding monitoring

How does a light trap work?

Light traps emit light for 3-4 hours during the evening. It attracts male and female Ostrinia nubilalis, which as a result of contact with a pyrethroide agent, fall into the container. Then it is possible to remove them and document them.

How does a pheromone trap work?

Pheromone traps are equipped in cardboard strips soaked in attracting agents. They attract only male Ostrinia nubilalis which are captured alive. The functionality of pheromone traps depends mostly on the location and region and therefore it requires careful monitoring.

What is a hatching cage?

A hatching cage is a cage made of gauze in which last year’s stubble with Ostrinia nubilalis sidewalks is placed. It allows hatching of butterflies to be observed in an easy way.

How many traps are required for a region?

The more traps in the region, the more precisely it is possible to establish the right time for spreading. Therefore it is recommended to use at least one light trap per one microclimate region.

Why don’t we place traps in the maize field?

Ostrinia nubilalis usually remains on the edge of fields and meadows. It goes to the maize plantations only to lay eggs. Therefore light or pheromone traps are placed at the edges of fields.