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Effect of Seedbed, Root-dip and Soil Treatments with Nematicides to Control Rice Ufra Disease

M. L. Rahman
Plant Pathology Division, Bangladesh Rice Research Institute, Joydebpur, Gazipur-1701, Bangladesh.

S. A. Miah
Plant Pathology Division, Bangladesh Rice Research Institute, Joydebpur, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

Efficacy of Furadan 5G, Mocap 5G and Tecto 40FL (fungicide with nematicidal value) was tested as seedbed, root-dip and field soil treatments for controlling ufra disease after symptom initiation on rice seedlings of cv. BR11. The ufra measuring parameters e.g. percentage of damaged tillers, ufra I, ufra 2, ufra 3 and total ufra were significantly less in the nematicidal treatments than the untreated (diseased) control. There was 8.0-11.1% total ufra in 1989 and 17.5-27.6% in 1990 when Furadan 5G or Mocap 5G was applied at 0.75 kg a. i. /ha either as seedbed or field soil treatment. It was also less than 26% when 1% solution of Tecto 40FL was used in either of the three methods of application. The best effect was achieved when Tecto was used as root-dip treatment. The control (diseased) treatment had 77.2-95.4% ufra incidence. Yield was also significantly higher in all the nematicidal treatments (4.3-7.6 t/ha) than the untreated control (1.3-1.7 t/ha). This yield was almost equal or some time higher than the yield obtained from the non-infested control (healthy) treatment (5.7-6.8).

Keywords: Seedbed, Soil treatments, Nematicides, Rice, Urfa diseases

Location: Plant Pathology Division, Bangladesh Rice Research Institute, Joydebpur, Gazipur

Start Date: 00-00-1989

End Date: 00-00-1990

Program Area: Pest Management

Commodity: Rice

Objectives:

To asses the possibility of controlling disease through seedbed, seedling and soil treatments with nematicides before transplanting the seedlings in a field under continuous rice culture.

Methodology:

Seedlings of cv. BR11 were raised in six 1 x 0.5 m size seedbeds which were individually surrounded by mud plastered levee. At 21 days age, seedlings of five seedbeds were inoculated with the ufra nematode following seedling base inoculation method and the seedlings of the remaining seedbed was kept as uninoculated. Based on the initiation of chlorotic ufra symptom on the leaf sheath four weeks after inoculation, three seed begs were treated with either Furadan 5G or Mocap 5G at 0.75 kg a.i./ha or 1% solution of Tecto 40FL (4 L/ha) seven days before transplanting. For root-dip treatment, seedlings with ufra symptom from another inoculated seedbed were uprooted one day before transplanting, roots were washed and 12 bundles having 50 seedlings in each were made. Then the bundles were grouped into three and roots were soaked in either 1.5% solution of Furadan 5G or Mocap 5G, or 1% solution of Tecto 40FL for 12 hours. For field soil treatment, the nematicides at the same rate were incorporated into the soil of 2 x 1 m plots on the day of transplanting. Two control treatments, one with the diseased seedlings and the other with the healthy seedlings were maintained. Each plot was surrounded by 15-20 cm high mud plastered levee with 75 cm spacing between the plots to avoid spreading of the nematodes as much as possible. Two experiments were conducted following RCB design with four replications of each treatment in 1989 and 1990 seasons. At harvest crop from the whole plot was cut, panicles were categorized into damaged tiller (no panicle initiation), ufra 1 (panicle enclosed within the flag leaf sheath), ufra 2 (partial emergence of the panicle with mostly empty or partially filled grains) and apparently healthy panicle. Then healthy, ufra 2 and ufra 3 panicles were threshed, grains were winnowed, sundried and weighed at 14% moisture content.

Source of Information: Bangladesh J. Sci. Res. 12(1): 1-4, 1994 (June), ISSN: 0253-5432

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results in the present study suggest that ufra control with the use of Furadan 5G or Mocap 5G at 0.75 kg a.i./ha as seedbed or soil treatments and root soaking of infested seedlings in 1% solution of Tecto 40FL is possible and profitable specially in fields with rice-rice cropping pattern in the endemic areas. Moreover, seedbed or seedling treatments with these chemicals will obviously limit the incidence and spread of the disease.

Knowledge Management: Journal