Cumin (Cuminum cyminum) production is seriously reduced by the Fusarium wilt and leaf scorch diseases in Iran [1]. To evaluate the effects of different planting dates, planting pattern and biological fertilizers on yield, yield components of cumin and fenugreek (Trigonella foenum-graecum) and also essential oil content and disease development in cumin, an experiment was conducted in a split-plot factorial arrangement in randomized complete block design with three replications in Ferdowsi university research farm of Mashhad in 2010 and repeated in 2011. The experimental treatments were planting date (5 November, 5 December and 5 March) assigned to main plots, planting pattern (sole cropping and intercropping of cumin and fenugreek) and biofertilizer (control, Pseudomonas putida and Azotobacter chroococcum) were randomized in subplot. Results showed that fall planting dates and intercropping system had positive effects on cumin disease control, whereas application of biofertilizers had no significantly effect in both years. The highest diseased plants percentage was achieved by spring planting date in sole cropping system. Higher yield component and yield of the crops was achieved when the crops were planted at fall season than spring planting. Increasing of yield component and yield of cumin in fall planting was related to reducing of diseases severity. It seems that the fenugreek cultivated between the cumin rows as physical barrier could led to avoid of transferring and spreading of disease agent from one row of cumin to other rows. As observed, the benefit of pseudomonas was demonstrated on two the crops. Among various treatments of planting dates, fall planting dates showed higher essential oil yield of cumin. The values of LER for all treatments of planting dates and biofertilizer were more than 1 indicating that the intercropping system had positive effect on diseases control and subsequently on yield for the 2010 and 2011 growing seasons. In essence, modifying planting date and using intercropping systems could be considered as effective management ways to control of diseases without chemical control.

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