My rhododendron shoots turn brown. What can I do?

(Survey: General maintenance of rhododendrons )
 
The wrongdoer in this case is a green insect (resembling small grasshoppers) which transfer a mould infection onto your plants when laying their eggs. This causes the shoots to turn brown and the growth to decelerate. In case of a more serious infection, thousands of these insects spring from the leaves when you touch them. Can be treated thanks to an insecticide in August (for example Ekamet or Ripcord 10).
 
Link: nl.wikipedia.org/wiki/Cicade


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