Biological control of black spot of rose caused by Diplocarpon rosae

摘要

Fungal biological control agents were used either alone or in combination with fungicides to manage black spot of rose caused by Diplocarpon rosae under green house conditions. Black spot incidence in biological control agent and fungicide treatmentsalone or in combination treatments was significantly low (Disease ratings from 0.33 to 3.33) compared to pathogen check at all observation dates. At 100 days after first spray, lowest defoliation rating was recorded in chlorothalonil, Trichoderma harzianum-chlorothalonil and T. harzianum-mancozeb treatments (1.00). Highest vigour index was recorded in T, harzianum treatment. Highest flower production was recorded in C. globosum-chlorothalonil treatment(4.33) followed by T. harzianum alone and T. harzianwm-chlorothalonil treatment (4.00).