Root (wilt) disease of coconut palms in South Asia – an overview
| Autor: | Gandhi Karthikeyan, R. Ramjegathesh, L. Rajendran, I. Johnson, Thiruvengadam Raguchander, Ramasamy Samiyappan |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Archives Of Phytopathology And Plant Protection. 45:2485-2493 |
| ISSN: | 1477-2906 0323-5408 |
| DOI: | 10.1080/03235408.2012.729772 |
| Popis: | Root (wilt) disease (RWD) caused by phytoplasma is one of the most devasting diseases of coconut palms. The major symptoms of the disease in leaves are wilting and drooping and flaccidity; ribbing, paling/yellowing and necrosis of leaflets are typical symptoms of foliar diseases. Unopened pale yellow leaflets of spindle leaves are more susceptible to leaf rot disease, which is caused by Exerohilum rostratum and Colletotrichum gloeosporioides. RWD is caused by phytoplasmas, the cell wall-less prokaryotes that are bounded by a “unit” membrane. In ultrathin sections, they appear as a complex multi-branched, beaded, filamentous or spheroidal pleomorphic bodies. The disease was transmitted by plant hoppers (Proutista moesta) and lace wing bug (Stephanitis typica). Phytoplasmas are generally present in the phloem sieve tubes and in the salivary glands of these insect vectors. Phytoplasmas cannot be cultured in vitro, and hence it is very difficult to identify them. Using polymerase chain reaction technique, gro... |
| Databáze: | OpenAIRE |
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