Chemical and organic control of rhododendron leafhoppers

There are no fungicides available to treat rhododendron bud blast.

In severe cases, insecticides can be used to control rhododendron leafhoppers, the insects which may act as vectors for rhododendron bud blast.

Insecticides should be used only as a last resort. Before application, ensure plants are receiving the appropriate cultural care and take steps to protect natural predators. 

Apply insecticides from midsummer to early autumn.

Organic sprays containing natural pyrethrums can be used. These products have a short persistence so may need to be applied a number of times before the leafhopper population is under control. 

Contact (spray) insecticides, particularly synthetic pyrethroids such as lambda-cyhalothrin, deltamethrin, and cypermethrin, are used to control leafhoppers. Systemic insecticides containing Flupyradifurone are available for outdoor and glasshouse use.  

Follow instructions carefully when using insecticides. Plants in flower should not be sprayed due to the danger insecticides pose to bees and other pollinating insects. Insecticides can cause an outbreak of red spider mite since they often kill benefical insects that control mites.