date:May 16, 2017
when seen in that light.
Potato disease phytophthora infestans was very active last summer, which meant that several growers were forced to use copper oxichloride for fear of otherwise losing half their harvest. However, copper oxides can no longer be used as a pesticide since the turn of the century, only as a leaf fertiliser, and then only to a very limited degree (6 kg per hectare). Supervisor Skal, however, noted that some growers used this substance under false pretences, and he even spoke