Dr. Phyto

Macadamia

Macadamia integrifolia

Diseases & pests on this plant

• Macadamia husk spotPseudocercospora macadamiae

  Small yellow flecks on the green husk enlarge into grey-brown sunken spots; infected nuts drop early (some cling on as dried 'stick-tights'), reducing yield.

• Macadamia flower caterpillarHomoeosoma vagella

  Small caterpillars web together and feed inside the flower racemes during bloom, spinning silk and frass; damaged racemes dry off and drop, and young nutlets can be lost.

• Macadamia felted coccidEriococcus ironsidei

  Tiny pinkish scale insects under white felt-like sacs encrust twigs, leaves and nuts; heavy infestations cause yellow spotting, leaf drop, twig dieback and stunted trees.

• litchi fruit borerCryptophlebia ombrodelta
• Macadamia lace bugUlonemia decoris

  Small dark lace bugs cluster on flower racemes during bloom; feeding blackens and kills the flowers, which drop before setting nuts, sharply cutting yield.

• Phytophthora root + crown rotPhytophthora cinnamomi

  Sudden wilting + collapse of mature trees during summer heat stress, dark sunken cankers at base of trunk often oozing dark sap, root system rotted away to small white feeder roots only, gradual general decline + sparse foliage 1-3 years before final collapse, characteristic V-shaped soil-line lesion when bark peeled back.

• stem-end rotLasiodiplodia theobromae