This article fully discuss all of paddy nematode control method/ rice nematode control method
- Paddy stem nematode
The nematode feed ectoparasitically causing malformation of host tissue, stunting and wilting of plants. There are two types of symptoms, one is the swollen ufra, in which the panicles remain enclosed within the leaf sheath and there is a strong tendency towards branching of the stem in the infected portions; and other type called the ‘ripe ufra’, where the panicle emerges and produces normal grain only near the tip. The peduncle turns dark brown. The character ristic lesions appear on the stem just above one or more upper nodes. The nematode survives is a desiccated from in plant debris.
- Plough and follow during summer
- Burn the stubble.
- Rotate rice with jute.
- Soil application of Dazomet is helpful in minimizing the incidence of nematodes.
- Spraying diazinon 100 ppm on the soil in the rice crop completely controls the nematodes within 72 h.
Paddy nematode control method
- Rice root nematode (Hirschmanniella oryzae)
The nematode is a migratory endoparasite and it evades young roots. Heavy population of nematodes may cause yellowing and reduction in the number of tillers. The name mentek is usually applied to the above-ground symptoms like reddish discoloration of leaves and stagnation of plant growth. The underground symptom is essentially root rot. Evidence of brownish lesions on roots leads to extensive discoloration and eventual rooting of root system with an appreciable reduction in grain yield.
- Treat nursery beds before sowing with D-D injected @ 400/haor DBCP applied @ 10 l/ha in irrigation water.
- Transplanting of healthy nematode free seedlings, controls the root infesting nematodes but is expensive.
- Phorate/carbofuran @ 1-2 ka a.i./ha gives significant control of rice-root nematode.
- Maintenance of soil fertility through a balanced application of NPK and general sanitation including removal of root stubble after harvest from the field are helpful In reducing the nematode infestation.
- Rice white tip nematode : (Aphelenchoides besseyi Christie)(Paddy nematode control method)
The nematode is a parasite of aerial parts of plants. Infected seeds emerge late in seed beds and produce small seedlings. The upper 2 to 5 cm leaf tips turn white or pale yellow in the tillering stage. Then brown, and frayed. Flag leaves are typically shortened and twisted at their apical portions. There is a general reduction in the length and number of spikelets. Terminal tissues of the panicle are severely reduced and produce small deformed kernels. The maturity of the panicles is delayed and secondary panicles may arise from lower nodes if the panicle is sterile and lead to the appreciable loss in yield. The nematodes are seed transmitted.
- Hot water treatment of presoaked seeds at 52-550c for 15 minutes gives good control of the nematode. Presoaking of seed for 12 hours in cold water is needed.
- Soil treatment with diazinon @ 1-2 kg a.i./ha gives good control of nematode.
- Spraying of the infested crop with parathion (0.025%) and trichlorfon (0.03%) there times has been found to be effective.
- Rice root knot nematode (Meloidogyne graminicola Golden & Birchfield)
The nematode is essentially a problem in nurseries and upland rice. The nematode is an endoparasite. The infective second stage larvae penetrate roots at the Zone of elongation causing small galls. The leaf tips change to brown color from the margins towards the midrib. Severe infestation results in a reduction of plant height and frayed appearance of tillers. On the roots, club-shaped galls are formed. The growth of root tip is retarded. Profuse development of extra side roots takes place.
- Seeds treatment with Ceresan dry is most effective in reducing invasion of the nematode.
- Soaking of seeds in 500 ppm solution of phorate or carbofuran for 12 hours and root dips in 100 ppm solution of the above Chemicals for 12 hours before transplanting gives effective control of nematodes.
- Application of above chemical @ 1 kg a.i./ha gives good control in standing crops.
- Soil amendment with differentiated tea waste and water hyacinth compost reduced the nematode infestation.
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