Dr. Phyto

grapefruit

Citrus × paradisi

Diseases & pests on this plant

• brown soft scaleCoccus hesperidum

  Flat oval brown-tan scales (3-5mm) on undersides of leaves + along stems, sticky honeydew dripping onto floor or lower leaves, black sooty mould growing on the honeydew, leaf yellowing + drop in heavy infestations, ants attracted to honeydew.

• citrus tristeza virusCitrus tristeza virusEU-notifiable quarantine organism

  Vein clearing, stem pitting, dwarfing.

• citrus blackflyAleurocanthus woglumiEU-notifiable quarantine organism

  Black slipper-shaped scales (the nymphal stage — very distinctive) on undersides of citrus leaves, copious honeydew + black sooty mould on leaves + fruit + ground beneath trees, leaf yellowing + premature drop, branch dieback in heavy infestations, fruit downgrade from cosmetic damage.

• citrus longhorned beetleAnoplophora chinensisEU-notifiable quarantine organism

  Adult beetles (3-4cm with long curved antennae) on trunks in summer, large round exit holes (1cm diameter) at base of trunks (the diagnostic symptom — distinguishes from native longhorns), sawdust at base of trees, branch dieback + crown decline, infested trees gradually killed.