The effectiveness of the chemicals was deteriorating rapidly, so Christiaan switched to the gall midge Aphidoletes, which turned out to be successful.

Biological aphid treatment in roses using Aphidoletes gall midge is a great succ...

Until recently, controlling aphids caused Christiaan Bot, production manager at Arend Roses in Maasland, a lot of headaches. Although he is familiar with biological