Status of tobacco black shank disease in Golestan province

The casual agent of tobacco black shank disease, Phytophthora nicotianae Breda de Haan (=P. parasitica Dasture), is one of the most important pathogen in tobacco fields. Disease can occur at all stages of plant growth and damage can occasionally reach up to 100% in some fields. In order to determine the status of the disease in tobacco fields of Golestan province, 45 tobacco fields were selected in five different village of Gorgan regions (Taghartappeh, Jafarabad, Ghorogh, Nodehmalek and Valeshabad) and in four different village of Aliabad regions (Pichakmahaleh, Baraftan, Fazelabad and Elazman) during 2014 growth season. The disease amount on aerial parts of tobacco plants was recorded during the infection period according to weekly surveys in the selected fields started when the primary symptoms become apparent. Statistical analysis was performed using the Stat Graphics Centurion XV software. The disease incidence was similar in different regions but there was significant difference (P