Chemical and organic control of leafhoppers

It's best to tolerate the leaf mottling leafhoppers cause since it usually has no effect on plant health or flowering.

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 late spring to early summer to control the first generation of leafhoppers, again in late summer for the second generation.

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. Acetamiprid, a systemic neonicotinoid insecticide, is also available. 

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.