|Package of Practices
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Adults scrap and feed on the chlorophyll of new leaves. Young seedlings are more affected and start drying from tips. Typical damage can be seen as white blotches on leaves.
Management of Flea beetles
Spray monocrotophos 0.05% at the time of incidence.
Dusting the crop with Carbaryl (Sevin 5%) or Malathion 5% dust or chlorpyriphos 2% dust @ 20 kg/ha in the morning hours with duster or spraying the crop with 0.05 % monocrotophos or 0.07% endosulfan or 0.05% quinalphos (Ekalux) to reduce the population.
(B) Lowland: Lowland rice is infested in nursery as well as after transplanting.
1.Nursery: Many insects infests rice in nursery, viz., root aphid, flea beetles, stem fly, stem borers, WBPH, green leaf hoppers, grass hoppers, filed crickets & hairy caterpillars and cause severe damage.
Management: Soil incorporation with Carbofuran 3G @ 3.3 gms/m2 before sowing followed by one spraying with monocrotophos 0.05 % at 20 days after sowing reduces the damage.
Nature of damage:
Nymphs and adults both suck the sap from the developing grain at milky stage by which grain become chaffy, empty and some grains develop but break during milling.
1. Soil incorporation with Carbofuran 3 G @ 1.6 g/m2 (l/2 kg. a.i. /ha) followed by root -zone spray with monocrotophos (0.05 % concentration) at 60 days after sowing.
2. This will also reduce other pest like stem borer, stem fly, leaf roller, WBPH and green leaf hoppers.
Nature of damage:
1. Nymphs and adults suck the sap from the tender roots. In heavy infestation seedlings' growth is stunted, become pale yellow in colour and do not flower.
2. The infestation starts in vegetative stage 25 -30 days after sowing and continues till ripening.
1. The disease is caused by Rhynchosporium oryzae;
2. Leaves get blighted with dark and light brown zonations.
3. The symptoms may start from tip or margin of the leaf.
Management of disease
1. One or two sprays of 0.1% carbendazim 50 WP at Panicle Initiation reduce the disease severity
The disease is caused by Helminthosporium oryzae. It produces oval dark brown spots on leaves and plumes.
The disease occurs mostly in deficient and P90r soils and when severe, causes heavy damage both in nursery and in the field.
Management of brown spot:
Correction of soil deficiency and application of balanced nutrition reduces the disease
A) Chemical control
1. Seeds should be soaked for 12 hrs in 0.1 % Carbendazim 50 WP (Bavistin, Derosol or JKstein) prior to sowing of nursery or broadcasting for upland rice.
2. Root dip treatment to the seedlings immediately after uprooting is recommended for 12 hrs in 0.1 % Carbendazim 50 WP (Bavistin, Derosol or JKstein) in low land crop.
3. Bavistin (0.1 %) followed by Hinosan (0.1 %) or Dithane M -45 (0.25%) should be sprayed at fortnightly interval beginning from first appearance of the disease. Sandovit or Triton should be used as sticker @ 0.2% with spray solution to obtain better control of the disease. For low land crop apply Kitazin granules 17G @ 30 kg/ha in 2 equal split doses at tillering and booting stages with standing water in the field.
B) Avoid higher levels of nitrogenous fertilizer because
1. Higher levels of nitrogenous fertilizer favour the disease.
2. Nitrogen should be applied at 40 -60 kg/ha for upland and 50 -60 kg/ha for low land in three equal split doses at:
• one week after sowing or transplanting.
• Tillering and
• Panicle initiation stage.
1. Typical leaf lesions are spindle shaped, usually with reddish yellow margin; grey in the centre.
2. Leaves of susceptible varieties may be killed. The fungus may also attack the stems at nodes which turn dark brown to blackish in colour and tend to break easily.
3. Lesions may also occur on panicle neck. The infected necks turn blackish and break over. Neck blast results in few or no seeds in the panicle.
1. Causal organism -Magnaportha grisea is endemic in north eastern states.
2. This disease affects the crop at all the growth stages viz., nursery, tillering and flowering.
3. The yield loss ranges from 36 -50% depending upon the variety and environmental conditions