ROOT ROT OF ANNONA IN RELATION TO CERTAIN FERTILIZERS AND FUNGICIDES | ||
| Journal of Plant Protection and Pathology | ||
| Article 9, Volume 28, Issue 5, May 2003, Pages 4089-4099 PDF (1.23 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2003.243525 | ||
| Authors | ||
| Fatma M. Radwan,1; Galila A. Said2 | ||
| 1Plant Pathology Research Institute, Agrl. Res. Center, Giza, Egypt. | ||
| 2Horticulture Research Institute, Agric. Res.Center, Giza, Egypt. | ||
| Abstract | ||
| Isolation trials from rotted roots of annona plants collected fro different localities revealed the presence of seven fungal genera including Bo odiplodia theobromafl. CUNu/aria sp .• Fusarium oxysporum. F. semitflctum. Macrophomina phaseo/ina. Pythium ummum, Rhizoctonia solani and Nigrospora sp. However, F. oxysporum was the most dominant fungi followed by R. so/ani. B. thaobrom 9 and M. p,');;s90Iina. Among the isolated fLlngi, F. oxysporum was the most pathogen c cau~ing yellowing. wilting and mortality on the seedlings. Applying ammonium sui ate at the rate of 5 and 10 gm/plant. significantly increased the percentage of infectio than the other fertilized treatments. The lowest percent of infection was detected in the treatment with potassium sulfate (2.5 and 5 gmlplant). All fertilizers tested significantly increased plant growth parameters compared with the control. Kristalon (NPK) at the rate of 2 and 4 gm/plant, showed the highest values of plant height and number of leaves per plant. Soaking seeds in suspensions of the tested fungicides reduced Ihe percentage of seedlings infected with F. oxysporum. However, Vitavaxrr a d Homai were the most effective in controlling the disease. Soil drench with Ihe tesled fungicides revealed that Topsin M followed by Vltavaxrr gave the highest percentages of healthy survival seedlings, 90 days after transplanting. | ||
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