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Location wise
18
Aug

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

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

18
Aug

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

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.

18
Aug

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

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.

18
Aug

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

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

18
Aug

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

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

18
Aug

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

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

18
Aug

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

Disease initiation on leaves and 50% panicle emergence stage.

18
Aug

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

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.

18
Aug

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

By uprooting and destroying infected plants from the field.

18
Aug

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

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.

18
Aug

Is there any effective fungicide for the control of foot rot and bakanae after transplanting of rice?

 No

18
Aug

Suggest the control measures for foot rot and bakanae in basmati rice?

Soak 10 kg seed in fungicidal suspension prepared by dissolving 10 g Emisan or Bavistin and 1 g Streptocycline in 10 litre of water for 24 hours. Uproot the nursery in standing water.

18
Aug

What are the major diseases of basmati, high yielding varieties and hybrid rice in Haryana?

Blast, foot rot and bakanae are the major diseases of Basmati rice while bacterial blight and false smut of high yielding varieties and hybrids.

18
Aug

Is it true that some insecticides increase the population (number) of insect pests?

Yes, it is true. Several insecticides like lambda cyhalothrin increase the population of planthoppers while phorate and carbofuran that of leaf folder in rice.

18
Aug

What precautions should be taken to avoid health hazards due to pesticidal spraying?

Don’t eat, drink and smoke during spraying.

Wear gloves, gas mask and protective clothes.

Don’t spray pesticides against the wind direction.

18
Aug

Which insect pest sucks the juice from developing grains of paddy?

Gundhy bug which is slender and greenish-yellow in colour and emits an offensive odour.

18
Aug

Does the spray of monocrotophos after flowering cause blackening of grains?

It does not produce such symptoms on grains at recommended spray volume.

18
Aug

What is the best time for the control of planthoppers?

Spray the crop with recommended insecticides when there is 5-10 nymphs and adults/plant.

18
Aug

Is any basmati variety resistant to planthoppers?

No, none of the commercially grown Basmati variety is resistant.

18
Aug

Where do planthoppers feed?

They are found at the base of plant and suck the sap from the plant.

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