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PATHOGENICITY OF PATHOGENESIS OF ONION DOWNY MILDEW CAUSAL AGENT Peronospora destructor (BERK.) CASP | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 14, Issue 3, 2009, Pages 0-0 | ||
| Authors | ||
| M. S. Hassan; E. M. Al-Kanaany | ||
| Abstract | ||
| A study was conducted on onion downy mildew caused by Peronospora destructor (Berk.) Casp. In Agric. College, Baghdad Univ., 2004. The disease has caused up to 47.99% loss. The local red onion was more resistance to the disease than Texas Early Grano cultivor , the rate of disease increase (r) value reached 0.041-0.015 and 0.048-0.141 respectively. The pathogen infected Amarllidaceac plants Garlic, Leek and Onion with no host specificity. The primary infection was the Oospore present with plant residues. The infection appeared 15 days earlier in soil naturally infested with onion residues than the field with bean residue. | ||
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