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EFFECT OF ROOT- KNOT NEMATODE MELOIDOGYNE JAVANICA AND ITS INTERACTION WITH SOME SOIL BORN PATHOGENS ON TOBACCO SEED GERMINATION AND SEEDLINGS GROWTH AT DIFFERENT AGES | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 14, Issue 6, 2009, Pages 0-0 | ||
| Authors | ||
| B.G. Anton; M.H. Al-Jboory; Z.A. Stephan | ||
| Abstract | ||
| Three experiments were conducted to study the effect of the inocula levels of the root-knot nematode M. javanica and the two pathogenic fungi Fusarium solani and Macrophomina phaseolina before and at sowing tobacco seeds, and on seedlings at age of 3,5 or 7 weeks. Also to study the affect of nematode population densities 0,1000,2000,4000 and 8000 juvenile /pot on tobacco plants at age 30 or 60 days in a plastic pots under plastic or lath house conditions. Results showed that applied different nematode inocula levels to tobacco seedlings at age 30 or 60 days increased the root-gall disease index and decreasing plant height and dry vegetative and root weights by 7.29-72.9, 38.5-75.0 and 41.4-88.5% respctively. The interaction negatively affected the percentage of seed germination and plant growth with significant differences to the control (untreated) plants. Beside that the 5 or 7 weeks old tobacco plants showed more resistance for infection by the disease complex than those of 3 weeks old seedlings. | ||
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