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Incidence, Economic Importance, and Control of Tomato Yellow Leaf Curl in Jordan. Abdullah Al- Musa, Assistant Professor, Department of Plant Protection, University of Jordan, Amman. Plant Dis. 66:561-563. Accepted for publication 22 September 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-561.

In the Jordan Valley, the incidence of tomato yellow leaf curl at the end of the season ranged from 0 to 13.2% in spring-grown tomatoes and from 93 to 100% in fall-grown tomatoes. Under greenhouse conditions, yield losses were significant (63%) when tomato plants were inoculated 10 wk after sowing; inoculations at 15 wk did not produce significant yield reductions. In field tests, cucumbers, eggplants, or corn were planted in rows alternating with tomatoes 30 days before the tomato seedlings were transplanted, and tomato yellow leaf curl was effectively delayed in plots interplanted with cucumber but not in plots interplanted with corn and eggplants. Cucumbers were better hosts than tomatoes, eggplants, and corn were for whiteflies, which may explain why cucumbers were effective in delaying infection of tomatoes.