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teknik pembibitan tanaman dan produksi benih jilid 1 smk

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penyakit Pucuk-keriting (Curly Top), <strong>dan</strong><br />

juga gejala penyakit “Aster Yellows”<br />

Gejala penguningan (yellows symptoms).<br />

(1). Chlorosis yang menyeluruh <strong>dan</strong><br />

permanen pada daun-daun <strong>dan</strong> lain-lain<br />

(Permanent uniform Chlorosis of leaves,<br />

etc.): Gejala “Aster Yellows”.<br />

(2). Mahkota bunga menguning atau<br />

menghijau (Greening or Yellowning of<br />

Petals): Gejala penyakit “Aster Yellows”<br />

pada <strong>tanaman</strong> Aster <strong>dan</strong> Delphinium<br />

Virus-Virus Penting yang Menyerang<br />

Tanaman<br />

Virus mosaic tembakau (Tobacco mosaic<br />

virus)- vector aphids. Virus mosaic<br />

ketimun (Cucumber mosaic virus) vector<br />

aphids. Virus Pucuk-keriting (Curly-top<br />

virus)-vector eblalang-daun (leafhoppers),<br />

satu species Virus Aster yellows (Aster<br />

Yellows virus)-vector belalang<br />

daun(leafhopper). Virus layu-berbercakbercak<br />

(Spotted wilt virus)-vector thrips.<br />

Virus mosaic alfalfa (Alfalfa mosaic virus)vector<br />

aphids<br />

Gambar 5.53.<br />

Gejala serangan virus pada daun tembakan<br />

Gambar 5.54.<br />

Kutu daun, salah satu vektor virus<br />

<strong>tanaman</strong>.<br />

• Virus yang menyerang inang<br />

dalam satu famili.<br />

Virus mosaic Peach (Peach Mosaic<br />

virus)-vector tungau eriophid. Virus<br />

“Western X- disease”-vector belalang<br />

daun (leafhopper). Virus Tristeza dari<br />

Citrus-vector aphids. Virus mosaic tebu<br />

(Sugarcane mosaic virus)-vector tak<br />

diketahui. Virus busuk-melingkar hitam<br />

dari Kobis (Cabbage black ring-rot virus)vector<br />

aphids. Virus mosaic buncis (Bean<br />

mosaic virus)-vector aphids (11 species)<br />

Gambar 5.55.<br />

Gejala serangan virus pada polong kacang<br />

buncis<br />

• Virus yang menyerang inang<br />

dalam satu genus<br />

Virus nekrosis Phloem dari Elm (Phloem<br />

necrosis virus of Elm)-vector kumbang-<br />

224

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