Karakteristik

Tidak disebabkan oleh patogen atau mahluk hidup

Non infectious disease, penyakit tidak menular

Bersifat khusus dan tidak mudah dikenali

Timbul bersama gejala lain

Berat dan ringannya penyakit tergantungseberapa besar penyimpangan dari keadaannormal/optimum

Diperlukan pengetahuan silvika, silvikultur, keharaan dan kondisi lingkungan

PENYAKIT ABIOTIK

DIAGNOSIS

Nutrient Deficiency

Water stress

Over Temperature (drought)

Fire

Ice melted disaster

Water excessive

Animal destruction

Wind break

Effect of media

Sometimes roots develop in an unfortunate position, choking off other roots or the base of the stem as they develop. This is especially common on planted seedlings. It is made more likely by growing of seedlings in containers or close cultivation of the soil.

Girdling Roots (tergenang, solumdangkal)

2. Forest Disease Management

Detection RecognitionAppraisalWhat type of management is appropriate?

B. Disease Management Strategiesa. Silviculturalb. Chemical c. c. Biological d. Geneticse. Quarantine and inspectionf. Passiveg. Increasing pathogens

ClearcuttingPruningThinningSanitation inoculumremovalSpecies selectionFertilizationPrescribed fireAvoidance

Silvicultur technique

Soil fumigation in nurseriesBorax stump treatment for annosumroot rotHerbicide or growth regulator mistletoeInjections vascular wiltsFoliar spraying Xmas trees

CHEMICAL CONTROL

Bological controlCompetitionDecay fungi in stumpsTrichoderma-Phlebiopsis gigantea for H. annosum(Rotstop)

Protection -mycorrhizae

Genetics

Breeding for resistanceBetter for introduced pathogens than for native onesWorks well for rustsNot as effective for root diseasesd.

To prevent new pathogens and pests from being introducedWhite pine blister rust, Port Orfordcedar root disease, Dutch elm disease, Sudden oak deathMany pathogens come in on infected soil or plant material (APHIS Animal Plant Health Inspection

Service of USDA)Transporting fumigated seeds is best

QUARANTINE