Restriction the Spread of Viruses Caused Mosaic on Squash Plants by Using Several Field Control Methods and Studying their Effect on Chlorophyll

The study showed the effect of some agricultural methods in reducing the incidence of mosaic symptoms on squash plants by using mineral oil (Sunoco) at conc. 2.5% at 15 days interval by spraying the leaves, this treatment was the best one because it decreased the disease incidence to 24.6% compared with 54% in control. Also using yellow water traps and aluminum stripes to attract aphids, reduced disease incidence to 28.6 and 13.3% respectively. The diagnostic study which conducted by using indicator plants and antisera, detected three viruses which cause mosaic symptoms: Cucumber mosaic Cucumovirus (CMV), Zucchini yellow mosaic Potyvirus (ZYMV) and Watermelon mosaic Potyvirus (WMV2). The results showed that these symptoms reduced chlorophyll content to 47.5%.