Timing tungro rice planting to control rice tungro disease S. Sama and A. Hasanuddin, Maros Research Institute for Food Crops, P.O. Box 173, Ujung Pandang, South Sulawesi, Indonesia; and R. C. Cabunagan and H. Hibino, IRRI Green leafhopper (GLH) Nephotettix virescens fluctuation and rice tungro virus (RTV) incidence were monitored in Lanrang Substation, Sidrap, in 1977-81. GLH density and RTV incidence were high January-March and July-September. Fluctuation patterns of GLH population and RTV incidence showed a fairly uniform trend (Fig. 1). Recommended planting dates were formulated based on these data and rainfall patterns for different areas. The recommendation was to plant the wet season (WS) crop in April-May, at the peak period of rainfall when GLH populations were very low. The dry season (DS) crop was to be planted in November-December when GLH density also was very low (Fig. 2). Varieties for irrigated and rainfed areas were recommended depending on duration needed. In fields planted at the recommended time, GLH density did not increase until after the rice plants reached late tillering or flowering. Thus, rice escaped the critical period (the first 30-45 days after transplanting) for RTV infection. A 1985-86 survey found that 90% the recommended schedule. Large areas were planted in synchrony and a definite fallow period between crops (1-2 months) occurred. After the adoption of the planting schedule and selected varieties, RTV incidence was low. Occasional incidence occurred in fields planted late.

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Page 1: jameslitsinger.files.wordpress.com … · Web viewTiming tungro rice planting to control rice tungro disease. S. Sama. and A. Hasanuddin, Maros. Research Ins. titute for Food Crops,

Timing tungro rice planting to control rice tungro diseaseS. Sama and A. Hasanuddin, Maros Research Institute for Food Crops, P.O. Box 173,

Ujung Pandang, South Sulawesi, Indonesia; andR. C. Cabunagan and H. Hibino, IRRI

Green leafhopper (GLH) Nephotettix virescens fluctuation and rice tungro virus (RTV) incidence were monitored in Lanrang Substation, Sidrap, in 1977-81. GLH density and RTV incidence were high January-March and July-September. Fluctuation patterns of GLH population and RTV incidence showed a fairly uniform trend (Fig. 1).

Recommended planting dates were formulated based on these data and rainfall patterns for different areas. The recommendation was to plant the wet season (WS) crop in April-May, at the peak period of rainfall when GLH populations were very low. The dry season (DS) crop was to be planted in November-December when GLH density also was very low (Fig. 2). Varieties for irrigated and rainfed areas were recommended depending on duration needed.

In fields planted at the recommended time, GLH density did not increase until after the rice plants reached late tillering or flowering. Thus, rice escaped the critical period (the first 30-45 days after transplanting) for RTV infection.

A 1985-86 survey found that 90% the recommended schedule. Large areas were planted in synchrony and a definite fallow period between crops (1-2 months) occurred. After the adoption of the planting schedule and selected varieties, RTV incidence was low. Occasional incidence occurred in fields planted late.

Fig. 1. Rainfall pattern, cropping pattern, and GLH population fluctuation and RTV incidence in susceptible variety Pelita I-1. Monthly average for 1977-81, Sidrap, South Sulawesi, Indonesia.

Page 2: jameslitsinger.files.wordpress.com … · Web viewTiming tungro rice planting to control rice tungro disease. S. Sama. and A. Hasanuddin, Maros. Research Ins. titute for Food Crops,

Fig. 2. Recommended planting dates and rice varieties for seven districts “Kecamatan” in Sidrap, South Sulawesi, in 1987 wet season and dry season. Superimposed is the trend in GLH population. Source: DINAS PERTANIAN SIDRAP. I = irrigated, R = rainfed, M = medium, E = early, L = late.

Sama S, A Hasanuddin, RC Cabunagan, H Hibino. 1989. Timing tungro rice planting to control rice tungro disease. International Rice Research Newsletter 14 (5) 25-26.