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Evolution and InnovationSave Biodiversity...Rise

Lethal yellow

Infected leaves

Note the small yellow inner leaves caused by a mycoplasma-like organism

Note the small yellow inner leaves caused by a mycoplasma-like organism

Note the small yellow inner leaves

caused by a mycoplasma-like organism

Cause

Candidatus Phytoplasm australiense.

Symptoms

Infected plants show some inward rolling and purpling of older leaves, which flatten to the ground. Young leaves develop yellow margins and remain small with short leaf stalks, causing clusters of small, yellow-fringed leaves in the centre of the plant. Plants become stunted and usually die. Runners from infected plants also show symptoms.

How does it spread?

Pathogens are transmitted to strawberry plants by leafhoppers after they have fed on infected alternative hosts. Symptoms develop six to eight weeks after the strawberry plant is infected. This means lethal yellows symptoms appear after the runners are harvested and planted into fruit production beds. There is little transmission of the disease between strawberry plants.

Crops affected

Strawberry

Control options

Remove infected plants and attached runners in runner beds. Plant runners from approved or certified runner schemes.

Control weeds around strawberry blocks. Use appropriate chemicals to control leafhoppers in runner production areas.

Chemical registrations and permits

Check the indian Pesticides and Veterinary Medicines Authority chemical database and permit database for chemicals registered or approved under permit to treat this disease on the target crop in your state or location. Always read the label and observe withholding periods.

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