Protectant and curative efficacy of different fungicides against citrus melanose caused by Phomopsis citri under in vivo conditions

摘要

Melanose caused by Phomopsis citri pose a major threat to citrus plants that can affect trees at any age and damages fruit, leaves, twigs, branches. If favorable conditions prevail, this disease may result in heavy economic losses. Present study was conducted for In-vivo Protectant and curative efficacy evaluation of fungicides against P. citri. Five treatments consisting of chemicals viz., Emesto Silver 240 FS % (Penflufen), Kocide? 3000 (Copper Hydroxide), Nativo 75% WG (Tebuconazole + Trifloxystrobin) and Score 250 EC (Difenoconazole) were prepared at recommended doses with three replications and control plants were untreated. Data was recorded on disease incidence (%) and disease reduction over control (%) at weekly interval. In general, all the tested fungicides exhibited significant antifungal potential when applied as protectant while least effective or show no activity as curative. The least disease incidence was observed with Kocide i.e., 12% followed by Nativo (18%) whereas the highest incidence (21%) was recorded by Score and Emesto silver. Percent disease reduction over control was calculated and revealed that Kocide, Nativo, Score and Emesto silver significantly lowers (P 0.05) the incidence of melanose by 80, 71, 65 and 65% respectively. It was concluded that Kocide is best for the management of citrus melanose when applied as protectant under in vivo conditions.