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20
Jul

Coastal area ecosystem

1. A major area of nearly 0.21 m ha of rice is covered by the coastal area with the productivity of 2.9 t/ha. This area comprises the entire district of Udupi and Mangalore as well as part of Uttar Kannada district.

2. This area enjoys very good annual rainfall of about 3600 mm. The rice soils are mostly laterites with poor fertility and are generally deficient in lime. In coastal ecosystems, the farmers used to grow the crop under five different periods / seasons and locally in Kannada

20
Jul

Different rice based ecosystems in Karnataka

In Karnataka, based on the agro-climatic situation, amount and distribution of rainfall, soil type and prevailing agro-climatic practices, Rice growing ecosystems has been broadly classified into following six categories.

1. Coastal area.

2. Hilly area.

3. Transitional area.

4. Tankfed area.

5. Irrigated maidan area (South).

6. Irrigated maidan area (North).

20
Jul

Symptoms and Nature of damage of Rice Hispa

Symptom of attack Rice hispa:

The mining of the grubs will be clearly seen on the leaves. White parallel line will be clear on the leaves.

Nature of damage of Rice hispa:

The grub mines into the leaf blade and feed on the green tissue between the veins. Adults also feed in the green tissue; they scra

20
Jul

Control of Rice Hispa

Spray triazophos 40 EC @ 400 ml ha-1 or phosalone 35 EC @ 850 ml ha-1 or chlorpyriphos 20 EC @ 1500 ml ha-1or quinalphos 25 EC @ 1200 ml ha-1 or monocrotophos 36 WSC @ 850 ml ha-1or ethofenprox 10 EC @ 450 ml ha-1or fipronil 5 SC @ 600 ml ha-1or apply carbofuran 3G @ 25 kg ha-1.

20
Jul

Life stages of Rice hispa

Egg: Eggs are laid inside minute slits on the tender leaves generally toward the tip.

Grub: The grub is whitish yellow and flattened. It feeds inside the leaf tissue by mining. It pupates inside.

Adult: The adult beetle is somewhat square shaped about 1/6 to 1/8” in length and width. Dark blue or blackish in colour with spines all over the body.

20
Jul

Rice Hispa

Order: Coleoptera

Family: Chrysomelidae

Scientific name : Dicladispa armigera

Local name :

20
Jul

Control of Grass hoppers

1. Expose the eggs to be picked up by birds after ploughing and trim the bunds. Bio-control agents such as Cacallus spp., Barycomus spp. and Seelio spp., which are egg parasites, should be encouraged. 2. Dusting the crop with 5-10% BHC (or) methyl parathion 2% @ 25-30 kg/ha, fenitrothion (or) malathion 5% @ 20 kg/ha. 3. Spraying nuvan 100 EC @ 200 ml/ha (or) malathion 50 EC @ 2.5 lit/ha.
20
Jul

Life stages of Grass hoppers

1. H. banian has only one brood in a year. O. nitidula breeds throughout the year. Egg: It lays eggs in the wet sandy soil during October to November at a depth of about 2”especially in the side of bunds.

2. The eggs are laid in batches of 30-40, hatch only in June to July on receipt of the monsoon rains. Eggs are yellowish and covered with gummy substrate that hardens into a waterproof coating.

3. Nymphs: The nymphs feed on the grasses or paddy.

4. A

20
Jul

Symptoms and Nature of damage of Grass hoppers

Symptom of attack of Grass hoppers:

The nymphs and adults nibble leaves and also earheads in the early stages.

Nature of damage of Grass hoppers:

Both the adults and nymphs feed on the leaf and in severe cases the entire leaf may be eaten away.

It is capable of causing severe damage. In the earhead stage

20
Jul

Grass Hoppers

Order: Orthoptera

Family: Acrididae

Scientific name : Hieroglyphus banian (Large grasshopper)

Scientific name : Oxya nitidula (Small grasshopper)

Local name :

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