Abstract
This study was conducted on grapevine showed decline symptoms and it was carried out in Ninava grapevine on (Shadda –Sudai) cv. The study indicated that the grapevine decline was caused by Curvularia lunata Ellis and its Telomorph stage Pleospora sp. C. lunata culture filtrate was purified by gel filtration ,TLC and calorimetric analysis by using spectrophotometer showed that C. lunata secreted two types of toxin whose wave length were 260-290 nm the two toxins showed different toxic effect to the grapevine
