Info

Source: Dohroo (2001).

a: minimum, b: moderate, c: maximum

Source: Dohroo (2001).

a: minimum, b: moderate, c: maximum

1990). A combination of mancozeb and carbendazim treatment to rhizomes controlled storage rot of ginger (Dohroo et al., 1986a; Dohroo and Malhotra, 1995; Dohroo, 2000).

Among the various fungicides used for dipping the rhizomes before storage to prevent storage rots caused by various fungi, mancozeb is known to persist longer than carbendazim when the rhizomes are steeped in fungicide solutions for 60 minutes (Sharma et al., 1992). Mancozeb residues were observed even after 120 days of storage. However, the health risk in carbendazim-treated rhizomes is low as compared to mancozeb if they are consumed after peeling (Table 8.12).

Dohroo and Korla (2000) conducted studies to find out the effect of suitable harvesting stage and curing time of rhizomes on storage rot of ginger (Tables 8.13 and 8.14). They found that the best time for harvesting ginger is in the first 2 weeks of December, and 48 to 60 hours curing of rhizomes decreased the incidence of disease.

Dohroo and Sharma (1984) studied biocontrol of rhizome rot of ginger in storage with T. viride. Besides, Dohroo (2001) studied the effect of seed treatment with fungicides and T. harzianum on the control of disease. Among the various fungicides, seed rhizome treatment with 0.2 percent Bavistin, 0.2 percent Topsin, 0.3 percent Dithane M-45, and combinations of Bavistin and Dithane gave a high level of protection to seed rhizomes.

Table 8.12 Persistence of mancozeb and carbendazim residues in rhizomes of ginger

Sampling interval (days)

Residue level (mg/kg) Mancozeb Carbendazim

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