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GEJALA PENYAKIT

GEJALA PENYAKIT. Proses infeksi jamur 1. Inoculation 2. Spore germination 3. Germ tube growth 4. Formation of appressoria 5. Penetration of the host 6. Colonization of the host 7. First symptomp of diasease 8. Sporulation/dispersal of inoculum

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GEJALA PENYAKIT

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  1. GEJALA PENYAKIT • Proses infeksi jamur 1. Inoculation 2. Spore germination 3. Germ tube growth 4. Formation of appressoria 5. Penetration of the host 6. Colonization of the host 7. First symptomp of diasease 8. Sporulation/dispersal of inoculum 9. Death of colony/sporulation ceases INOCULATION PERIODE GENERATION TIME PREPENETRATION PHASE INFECTION PERIODE PENETRATION PHASE POST- PENE- TRATION PHASE

  2. Gejala penyk (symptom) : reaksi tnm thd aksi patogen • Bukti keberhasilan infeksi • Gejala penyk ≠ tanda penyk (sign)

  3. * Sindrome gejala* Variatif (khas; mirip/hampir sama;symtopmless)* Dpt dilihat; diraba; dibau; pd semua bagtnmJenisnya : gejala morfologi dan histologySifatnya : gejala lokal dan sistemikLetaknya : gejala primer dan sekunder

  4. Tipe gejala:perubahan dlm sel tnm Nekrotis kerusakan atau kematian sel • Hidrosis; klorosis; bercak/spot; hawar/blight; preforasi; • Antraknosa • busuk/rot (basah & kering); • rebah kecambah/damping off (pre & postemergence damping off); • perdarahan/blooding (gummosis, latexosis, resinosis); • kanker; • layu/wilt; • mati ujung/die back dll

  5. Hipoplastis terhambat pertumbhn/perkembangan sel atau underdevelopment • Etiolasi; • kerdil (stunting, dwarfing); • klorosis; • perubahan simetri; • roset/rosetting dll

  6. Hiperplastis pertumbuhan/perkembangan sel melebihi normal atau overdevelopment • Erinosa; • kudis/scab; • menggulung/roll; • mengeriting/curl; • sapu/witches broom; • pembentukan alat yang luar biasa (enasi & antolisis); • perubahan warna; • sesidia/cecidium (fito/zoosesidia); • kerontokan dini dll

  7. Gejala serangan hama • Luka yg khas sesuai tipe alat mulut (penggigit pengunyah; pencucuk penghisap; penggerek dll) • Seringkali ditemukan organisme hama (telur; pupa; nimfa; imago) atau kotoran

  8. Aphid

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