An isolate of zucchini yellow mosaic virus (ZYMV) was obtained from naturally infected squash fruits were grown in Abees region, Alexandria governorate. Disease symptoms were Showing mosaic, yellowing and blistering and absis symptoms. The identification was based on the symptoms developed on diagnostic hosts and serological reactions with antisera to cucumber mosaic cucumovirus (CMV), watermelon mosaic potyvirus 2 (WMV-2) and ZYMV. Squash fruit isolate of ZYMV was transmitted by Aphis gossypii, Aphis neri and Myzus persicae in non-persistent manner. The virus was purified by ultra-centrifugation and PEG. The purified virus had an ultraviolet absorption spectrum typical of a nucleoprotein with A260/280 and A280/260 being 1.1 and 0.91 respectively. The yield of purified virus was 1.62 mg/100g infected leaf tissues. Specific antiserum was prepared and found to have a titer of 1:409600 as determined by indirect ELISA.
Zucchini yellow mosaic potyvirus (ZYMV) was first identified in northern Italy. It likes other species of the family Potyuiridue. ZYMV has been recorded in many countries since 1981. The efficient intercontinental spread of the virus can be explained by international trading of infected seeds. Since coat protein (CP) analysis has become a primary method for taxonomic assignment of potyviruses the aims were to characterize this genomic region of ZYMV originating from virus-infected cucurbitaceous seedlings. Virus infection in cucurbits is typically associated with mosaic symptoms on leaves and lumpy, distorted fruit. The range of symptoms produced by each virus can overlap and plants are commonly infected by more than one virus at once. The viruses are spread by many species of aphids moving through or within a crop. Control options include: destroying old cucurbit crops as soon as harvesting is completed destroying weeds and volunteer cucurbits, within and around crops as these harbor the viruses and/or the aphids separating new crops from maturing crops as these will have high levels of virus infection avoiding overlapping crops of cucurbits.
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