context: Pathogenic mycoflora of roses has about 270 species [2]. Under the conditions of Moscow and the Moscow Region, there are about 49 species of phytophage insects, including 32 - leaf-eating, 13 - sucking, 2 - mining and 2 - gall-forming. The most harmful species in all groups and varieties of roses are the rodent descending sawfly (Ardis brunniventris Htg.), Rosy aphid (Macrosiphum rosae L.) and the common spider mite (Tetranychus urticae Koch.) [3].
question: How many species does pathogenic mycoflora of roses have?
answers.text: 270