OCCURRENCE, DISTRIBUTION AND EPIDEMICS OF WHITE TIP NEMATODE, Aphelenchoides bessey ON RICE PLANTS IN EGYPT. | ||
| Journal of Plant Protection and Pathology | ||
| Article 11, Volume 30, Issue 2, February 2005, Pages 1169-1182 PDF (183.38 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2005.238701 | ||
| Authors | ||
| M. A. Abdel-Hadi1; E. t. EIshafeey1; M. S. Tadros2; M. H. Soliman3 | ||
| 1Dept. Agric. Botany, Fac. Agric., Kafr El•Sheikh, Tanta Univ., 33516, Egypt, | ||
| 2Dept. Econ. Entomology, Fac. Agric. Kafr EI-Sheikh, Tanta Univ., 33516, Egypt. | ||
| 3Rice Research and Training Center, Sakha, Kafr E1-Sheikh, 33516, Egypt. | ||
| Abstract | ||
| The occurrence of white tip nematode, Aphelenctioîdes besseyi was found to reflect a lengthy association with natural vegetation or climatic variations within different regions ¡n Egypt that are diverse enough to influence the pattern of nematode distribution and/or occurrenœ. Three methods of nematode extraction, ie. Baermann funnel, plate and sieving were used for nematocie extracting. Three nernatode inoculum levels. i.e. 250, 500, 1000 individuals/plant) were used, 5 days after rice transplants to study nematode symptoms throughout growth stages. Under field conditions, twenty-seven rice growing areas were selected according to easy access or nematode infected expectations, cho?cing 3-4 fields for each selected area throughout Nile Delta and surveyed randomly to record both healthy and diseased plants. In the meantime, at booting stage, samples of 200 grams of fresh rice panicles were cut to smati pieces, soaked in water for 48 hours to collect and record the extracted nematodes. Results emprasized that the damage, infection and plant symptoms were positively corr&ated with nematode inoculums level. Nematode extracts or isolation and separation methods indicated that Baermann funnel technique gave the best nematode counts and was considered to be the most efficient extraction method. Dynamic interactions of rice-nematode symptoms were found to influence numerous complex biotogical processes. The spatial model was chosen, and was considered to be the appropriate to iepresent the spatial nature of rice epidemics. It was found out that the resulting model can implement as a computer programme proving to be one of the useful investigative tools. Results indicated that Biala region (Kafr El-Sheikh) was highly epidemic, whereas Dakahlia and Sharkia Governorates were moderately epidemic. On the other hand, El-Senbiawain area (Dakahlia Governorate) was considered to be non-epidemic for A.besseyi infestation. The breeding program indicated that elmer local cultivars, Giza 178, Giza 176 and Giza 181 or different tested lines were more resis(ant varieties to nematode infectons, however symptoms were notced. Among 53 cultivars or lines, only 20 were found to be highly resistant, while Giza 171 was considered to be highly susceptible cultiva r. | ||
| Keywords | ||
| epidemics. resistant varieties; spatial model; white tip neniatode; A | ||
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