STUDY ON SEEDLING DISEASES OF CITRUS (Citrus spp.) IN SOME SELECTED NURSERIES OF RAJSHAHI

Abstract

Two experiments were carried out throughout the study period in order to study the seedling diseases of citrus. Five diseases were recorded on citrus seedling in four selected nurseries located in Rajshahi and the recorded diseases were citrus scab, citrus sooty mould, die back, citrus canker and yellowing or citrus plant were common in all the surveyed locations. The symptoms of scab appeared as on leaves branches, thrones and twigs. In .severe cases the plants withered and died. The incidence and severity varied from nursery to nursery and month to month. In case of citrus scab the highest disease incidence and disease severity (67.08%) and (62.00%) respectively observed in the month of July and the lowest disease incidence and disease severity was observed in the month of March. So far, for the disease development the temperature was 15.50-29.50oC and relative humidity was 75-85% while in case of citrus sooty mould the highest disease incidence and disease severity was observed in the month of March that was 18.80% and 14.13%-respectively, the lowest disease incidence and disease severity was observed in the month of January. So far, for the disease development the temperature was 15.00-25.00oC and relative humidity was 65-75%. Therefore citrus scab was the most prominent disease encountered on citrus seedling in Rajshahi