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Question : What is the role of weeds in initiation and spread of sheath blight of rice?
Answer :

The weeds particularly doob (Cynodon dactylon) help in survival and spread of sheath blight of rice.

Question : What are the remedial measures for chlorosis (iron deficiency) and khaira (zinc deficiency) disease of rice?
Answer :

Spray the crop with 1 kg ferrous sulphate (Hara kashis) and 5 kg urea in 200 litre of water per acre for chlorosis. For khaira disease spray 1 kg zinc sulphate and 5 kg urea in 200 litre of water per acre. Repeat the spray after 7-10 days, if needed.

Question : How symptoms of brown spot and leaf blast differ in paddy?
Answer :

In case of brown spot, the spots are round to oval in shape often surrounded by a yellow zone (yellow-halo) while in case of leaf blast these are spindle shaped with ash/whitish centre.

Question : What precautions should be taken while spraying copper oxychloride for the management of false smut of rice?
Answer :

Spray 500 g copper oxychloride in 200 litre of water/acre with knapsack sprayer.

Question : What are the precautionary measures for minimizing the incidence of bacterial leaf blight of rice?
Answer :

Grow resistant/moderately resistant varieties like HKR 120, PR 114, PR 116 and IR 64

Avoid excessive use of nitrogen

Avoid movement of water from diseased to healthy field

Question : How much yield loss bacterial blight can cause when it appears at maximum tillering and booting stage in Basmati rice varieties?
Answer :

33.3-82.1% depending upon the variety. The maximum yield loss has been observed in Pusa Basmati-1.

Question : What is optimum time/stage for fungicidal application for management of blast?
Answer :

Disease initiation on leaves and 50% panicle emergence stage.

Question : What is the difference between the symptoms of stem borer and neck blast in basmati rice?
Answer :

White ears due to stem borer are chaffy, remains erect and can be easily pulled out whereas neck blast infected panicles bear blackish spot at the base, can not be pulled out easily and bear shriveled grains.

Question : How we can minimize seed borne infection of foot rot and bakanae in basmati rice?
Answer :

By uprooting and destroying infected plants from the field.

Question : What factors are responsible for a significant variation in foot rot and bakanae incidence in two paddy fields transplanted with the same nursery?
Answer :

It depends on the presence/amount of inoculum of the pathogen Fusarium moniliforme in the field and the condition of nursery beds during uprooting of nursery. The field transplanted with nursery uprooted under battar condition will have more disease incidence than the field transplanted with nursery uprooted under flooded/standing water condition.

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