Field survey of Downy mildew (Peronospora tabacina Adam) on tobacco varieties cultivated in Lattakia
Abstract
A field survey of peronospora tabacina in tobacco nurseries and tobacco fields in Lattakia governorate was carried out. The survey included 112 fields and 112 nurseries, planted with different varieties of tobacco in 28 locations at different altitudes ranging from 60-750 meters, during the two seasons 2017- 2018. The percentage of disease frequency, rate of infection and severity was calculated in all fields and nurseries studied and in all varieties. The results showed the prevalence of the disease in varying proportions in all the surveyed areas and all of the Varieties included in the study (Baladi, Burli, Basma, Katerini) and Tanbak were susceptible to disease either in nurseries or in the fields. The average frequency of the disease in the fields respectively (30.35%, 48.21%) during 2017-2018, and in nurseries (29.46%, 30.18%). The highest rate of infection was recorded in the fields on the Baladi cultivar (53.61%) in the Jableh during 2018, and the highest severity factor on the Burley variety (30.86%) was found at a site in the Lattakia during 2018. Cultivated varieties varied in rate of infection and severity of infection and were all susceptible to disease, and the Burleigh variety was the most susceptible to infection.
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