Induction of resistance on eggplants against Verticillium wilt disease and root-knot nematodes using biotic and abiotic factors
2000
Elekcioglu, I.H. ((University of Cukurova, Adana (Turquie). Faculty of Agriculture, Department of Plant Protection)) | Canihos, Y. | Ozgonen, H. | Sogut, M.A.
The present study aimed to find out the effect of trifluralin, salicyclic acid (SA) and dead Verticillium culture on Verticillium dahliae and Meloidogyne javanica Race 1, and host resistance to wilt disease and root-knot nematode damage on eggplant. Three doses (0.5 mM, 1 mM and 2 mM) of trifluralin and two doses (0.5 mM and 1 mM) of SA were used to test the direct effect. For the host resistance experiment the 15-cm height eggplants were applied with 1/2x, 1x and 2x of recommended dose of trifluralin and 100 ml of 1 mM, and 2 mM SA to the soil daily for 4 days. The eggplant seedlings were also inoculated with 10(6) spores/ml of dead Verticillium culture. Following this inoculations eggplants were re-inoculated with V. dahliae and M. javanica. Trifluralin and SA at all concentrations significantly inhibited the mycelial growth of V. dahliae whereas only SA had resulted 64.4-99.5 percent of mortality against M. javanica at two doses used. Resistance of eggplant to wilt disease was significantly increased by all treatments tested. Trifluralin and SA treatment caused a significant reduction in the appearance of disease at all doses used. The highest effectiveness of trifluralin was obtained with the lowest dose. SA treatment at 1 mM concentration had the greatest inhibitory effect on the wilt disease among the treatments tested. Trifluralin at 2x recommended dose had the greatest inhibitory effect on the appearance of root gall and the reproduction rate of M. javanica. SA at both doses significantly resulted decrease of root gall. M. javanica did not reproduce in SA treated pots
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