CONTROL OF RHIZOME ROT OF GINGER THROUGH SELECTED CHEMICALS, BIOAGENT, PLANT EXTRACTS AND SOIL AMENDMENTS

Abstract

Experiments were carried out at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during March, 2011 to February 2012 to findout the efficacy of selected treatments viz. TI (Bavistin 50WP ), T2 (Ridomil Gold), T3 ( Dithane M-45 ), T4 ( Sulcox), Ts (Neem leaf extracts), T6 ( Alamonda leaf extracts), T, (poultry waste), Ts (Saw dust), T9 (Trichoderma harzianumy and untreated control for controlling rhizome rot of ginger caused by Fusarium oxysporum. In in-vitro assay the highest inhibition (86.33%) of mycelial growth of Fusarium oxysporum was observed in case of Bavistin 50 WP followed by Ridomil Gold MZ72 (83.77%), Dithane M-45 (82.66%), Trichoderma harzianum (81.11 %), alamanda leaf extract (77.7%), Sulcox (76.77%) and neem leaf extract (76.0%). In in-vivo assay the lowest disease incidence (27.78%) was recorded in case of T2 (Ridomil Gold) preceded by T, (poultry waste) (30.55%), T3 (Dithane M-45 ) (33.33%), TI (Bavistin 50WP ) (33.33%) and r, (Saw dust) (36.11 %) at 240 DAP (Days After Planting) while the highest disease incidence was recorded in control (63.89%) preceded by T4 (Sulcox) (38.89%) and T, (Neem leaf extracts) (38.89 %). All the treatments effect was found statistically significant in comparison to control. The highest reduction of disease severity (61.25 %) was recorded at 240 DAP in case of T7 followed by T2(58.34 %). The highest percentage of healthy tillers per plot was noted in case of treatment T7 (81.91%) which was statistically similar with TI, T2,Ts and Ts. The highest plant height (51.11 em) was recorded in case of treatment TI where rhizomes were treated with Bavistin 50 WP followed by foliar spray with the same. The second highest plant height was recorded in (50.89 em). The highest weight (2520.00 g) of the healthy rhizome was recorded in case of treatment T7.The highest rhizome yield (14.38 t/ha) was recorded in case of T7 which was 50.33% increased over control. Poultry waste as soil amendment, neem or alamonda leaves as plant extracts, Trichoderma harzianum as bio agent and Bavistin or Ridomil Gold as fungicide t could be used to control rhizome rot of ginger.