وارش، رقم جديد كاهو مناسب كاشت در استان هاي شمالي ايران و اقليم هاي مشابه

Cultivar Release Varesh, A New Lettuce Cultivar Suitable for Cultivation in Northern Provinces of Iran and Similar Climates

Babol local lettuce as a landrace in Mazandaran, has cultivated for many years. Local lettuce is a mixture of different genotypic and phenotypic forms which affects its marketability. It was purified by individual selection method during a three year priod (1998-2000) based on the selection for characteristics such as shape of bush, closed pome high yield, good marketability and resistance to diseases. A pure sample was developed in 2000 covering several good characteristics of the local lettuce and after evaluation in several agronomic and yield trial experiments it was registered as a new cultivar named Varesh in 2008. Varesh is a high yielding lettuce cultivar with good shape of bush, closed pome, good marketability and moderately resistant to Bremia lactucae Based on the agronomic trials, the plant density of 100000 (50x20 sowing pattern), 200 kgha"1 urea fertilizer and planting date of 22 November were recommend for this cultivar. The average yield of the new cultivar in farmers condition was more than 40tha_1. Address: Seed and Plant Inprovement Department, Agricultural and Natural Resources Research Center of Mazandaran, P. O. Box 48177-145, Sari, Iran.