الفهرس 
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Abstract
Watermelon (Citrullus lanatus) is one of the most
leading export vegetable crop in Egypt. In 1986, acreage
planted with watermelon was 147017 feddans and their
production was approximately 1275691 tons*.
Poor growth and low yield and quality of watermelon
have been a common complain of the growers during the
last few years due to the wide spread of viruses. The
most prevalent and widespread viruses are watermelon
mosaic virus-1 (WMV-1) and zucchini yellow mosaic virus
(ZYMV). Most of the important watermelon cultivars grown
in A.R.Egypt are susceptible to these viruses.
Since common control methods are not practical in
controlling these diseases, thus the useful way of con-
trolling these viruses is breeding for resistant varie-
ties. No genetical studies on the inheritance of resis-
tance to these viruses are available in Egypt.
Therefore, the objectives of this investigation
were to study the inheritance of resistance to WMV-1 and
ZYMV in three watermelon crosses. The results of this
study might help in breeding new varieties resistance to
WMV-1 and ZYMV through hybridization and selection. Department of Agricultural Economics and Statistics,
Ministry of Agriculture, A.R. Egypt, 1986.
This research was supported by the Cucurbit Acti-
vity of Vegetable Research Department, Ministry of Agri-
culture. The Activity has provided the plant introduc-
tions used in the study, and all facilities including
land and greenhouses. Also the virus isolates were pro-
vided by Dr. I.A. lbrahim, Cairo University, Faculty of
Agriculture.