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Susceptibility of Different Date Palm Cultivars to Infection By Terminal Bud Rot Caused By Thielaviopsis paradoxa (Deseyn) Hohn. | ||
| Basrah Journal For Date Palm Research | ||
| Article 3, Volume 5, Issue 1, 2006, Pages 29-41 PDF (0 K) | ||
| Authors | ||
| Mohammed. A. Fayed; Abbas M. Jasm; Ramiz. M. Al-Assadi | ||
| Abstract | ||
| This study was carried out in laboratories of plant protection department, Agriculture College. to evaluate susceptibilty of different cultivars of Date palm (produced by seed and tissue culture) to infection by terminal bud rot disease caused by Thielaviopsis paradoxa. The results of survey of terminal bud rot disease in different locations in Basrah province showed that the highest percentage of infection was recorded in orchards of shatt-Al-Arab which reached 33.51% followed by Al-Qarna and Abu Al-Khasseb. While the lowest percentage of infection was recorded in Al- Medina reached (4.54%). The results also showed that was a positive correlation between the infection rate and the salinity, alkaloids of soil. It was found that the cultivars of date palm (Hilawii, Sayer, Breim and Zahdi) were the most susceptible to infection by T.paradoxa. The percentage of infection was (36.66, 34.8, 30.9 and 29.11%) respectively. The study proved the significant differences between callus treated with cultural filtrate of T.paradoxa and untreated callus. Weight of callus decreased as the concentration of fungus culture filtrate increased, callus weight was (0.382gm) at concentration of 20% which then decreased significantly to (0.274gm) when the concentration was 30% growth completely failed at 50 and 75% concentration. It was also found that all seedling of different cultivars of date palm produce by seed was susceptible to artificial infection of T.paradoxa. symptoms appeared on seedling as yellowing, wilting and brewing on crown area-However the most decreases in fresh and dry weight was found in seedling of Hilawii, Sayer, Breim and Zahdi while the lowest decrease was in Berhi seedling. Many fungi like Fusarium spp was isolated from shoot and root system of date palm and from larva of shoot Pseudophilus testaceus but T.paradoxa was not isolated from larva of P.testaceus. | ||
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