Evaluation of certain newly introduced potato and tomato cultivars for late blight disease under Omani conditions [Oman]
1988
El-Sheshtawi, M. (Mansoura Univ. (Egypt). Faculty of Agriculture) | Mjeni, A.M.
Ten potato and 16 tomato cultivars were tested under field conditions for susceptibility to late blight caused by Phytophthora infestans (MONT) De Bary. The highest leaf infection index on potato was found on the cvs. Baraka and Spunta, whereas the cvs. Ajax and Origa were more resistant. The highest tuber infection percentages were found on the cvs. Baraka and Draga, while Ajax and Origa showed lower tuber infection percentages. The maximum leaf infection index in tomato was found on the cvs. Walter and Pacester-490, whereas the minimum was observed on Ace-55 vf and on Marmande-vf. The highest fruit infection percentage was noticed on the cvs. Walter and VFN-8 and the lowest fruit infection percentage was on Ace-55 vf and Marmande vf. The chemical control experiments on potato cv. Spunta and tomato cv. Ace-55 vf. showed that the fungicides polyram-combi, Dithane M45 and Tri-miltox-forte at the rate of 0.2%, 0.3% and 0.3% respectively, were effective in controlling the disease. The highest yield was recorded when polyram-combi was used
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