The scientists explain that another cause of the present situation is that plant protection agents lead to a disastrous spiral. While they reduce the short-term need for further plant protection agents since they strongly decimate the harmful organisms, the latters’ resistant representatives can spread all the more easily, the experts warn. And they add that ultimately, biodiversity is reduced as well, which also leaves more space for the resistant organisms to spread in the long term.

The result was even worse for fields with herbicide-resistant plants and Bt plants. One would have expected the opposite, given that the agent Bt has a very specific effect and thus supports maintaining a balance in biodiversity.

The scientists explain that the pollination services and hence also yield are less restricted the more insect species survive, with problems here above all being caused by neonicotinoids. But, they argue, since one and the same plant protection agent may have been used in monocultures year after year, the regional measure of resistances that can still be managed has been clearly exceeded.