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Pests

Pests
20
Jul

Symptoms and Nature of damage of Rice skipper

Symptom of attack of Rice skipper:

Leaves folded longitudinally and scrapped patches in such places.

Nature of damage of Rice skipper :

The caterpillar folds the leaves and feeds from inside. It feeds on the parenchyma and leaf gets reduced to skeleton. Occurs in the nursery and planted crop. Not a serious pest.

File Courtesy: 
ZARS, Mandya
20
Jul

Control of Rice Skipper

1. Parasites and predators usually control the population density of rice skippers in the field.

2. The eggs of rice skippers are parasitized by small wasps. Big wasps and tachinid flies parasitize the larvae. They are preyed upon by reduviid bugs and earwigs. The orb-web spiders feed on the adults during flight.

3. A nuclear polyhedrosis virus also infects skipper larvae.

File Courtesy: 
ZARS, Mandya
20
Jul

Life stages of Rice skipper

Egg: Eggs are laid on the leaves.

Larva: The caterpillar is elongate, yellowish green with four white dorsal stripes, smooth and with a constructed neck and red ‘V’ mark on the head, which is distinct.

Pupa: Pale green pupa has white longitudinal lines on it and is attached to the leaf blade by a silk girdle.

Adult: The adult is a dark brown skipper butterfly with two white spots on the wings.

File Courtesy: 
ZARS, Mandya
20
Jul

Rice Skipper

Order: Lepidoptera

Family : Hesperidae

Scientific name : Pelopidas mathias

Local Name:

File Courtesy: 
ZARS, Mandya
20
Jul

Symptoms and Nature of damage of Rice case worm

Symptom of attack of Rice case worm:

Plants stunted, caterpillars hanging on the leaf edges in a tubular case.

Nature of damage of Rice case worm:

1. The caterpillar cuts a piece of leaf, rolls it longitudinally into a tubular structure and remains inside. It feeds by scraping the green tissue of the leaf. The cases often float in the water.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
Mr. Y. Kondal Rao (DRR)
20
Jul

Control of Rice case worm

1. Flooding the field followed by dragging a roap across the field and draining out the water from the field.

2. Many predators including Spiders, dragonflies, Hydrophilid larvae and birds predate on larvae and adults.

3. Trichogramma minutum Ashmead is reported as a parasite of caseworm eggs.

4. A braconid wasp Dacnusa sp. and a tabanid fly Tabanus sp. parasitize the caseworm larvae.

5. Spraying the crop with 0.05 per cent fenitrothion or 0.05 per cent malathion or 0.15 per cent carbaryl.

File Courtesy: 
ZARS, Mandya
20
Jul

Life stages of Rice case worm

Egg: Eggs are light yellow, disc like, smooth and irregular in shape. They are laid on the underside of the leaves floating on the water.

File Courtesy: 
ZARS, Mandya
19
Jul

Rice case worm

Order: Lepidoptera

Family : Pyraustidae

Scientific name : Nymphula depunctalis

Local name:

File Courtesy: 
ZARS, Mandya
19
Jul

Symptoms and Nature of damage of Paddy gall midge

Symptom of attack Paddy gall midge: The central shoot instead of producing leaf produces a long tubular structure. When the gall elongates as an external symptom of damage, the insect will be in pupal stage and ready for emergence.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
Mr. Y. Kondal Rao (DRR)
19
Jul

Control of Paddy Gall Midge

1. Ploughing under the ratoon of previous crops can reduce infestation.

2. Control of grassy weeds and wild rice (alternate hosts) from surrounding areas can reduce Gall midge incidence.

3. Avoiding staggered planting (complete planting in an area within 3 weeks) to reduce infestation.

4. Apply carbofuran 3G @ 25 kg ha-1 (or) phorate 10 G @ 10 kg ha-1 or fipronil 0.3 G @ 25 kg ha. –1

File Courtesy: 
ZARS, Mandya
19
Jul

Life Stages of Paddy Gall Midge

Egg: The fly lays elongate, cylindrical, shinning white or red or pinkish eggs singly or in clusters (2-6) at the base of the leaves.

Maggot: Maggot is 1 mm long after hatching with pointed anterior end. It creeps down the sheath and enters the growing bud. An oval chamber is formed round the site of feeding.

Pupa: At the time of emergence the pupa wriggles up the tube with the help of antennal horn to the tip of the silver shoot and projects half way out.

File Courtesy: 
ZARS, Mandya
19
Jul

Paddy Gall Midge

Order: Diptera

Family : Cecidomyiidae

Scientific name : Orseolia oryzae

Local Name:

File Courtesy: 
ZARS, Mandya
19
Jul

Symptoms and Nature of damage of Rice Stem Borer

Symptoms of attack of Paddy stem borer: A number of stem borer moths seen dead and floating on the water in the fields. In the vegetative stage, dead hearts seen in the affected tillers and in the reproductive stage, whiteear may be seen.

Nature of damage of Paddy stem borer: The insect may start attacking the plants in the nursery especially long duration varieties.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
CRRI
19
Jul

Control of Paddy Stem Borer

1. Apply carbofuran 3G @ 25 kg ha-1 (or) phorate 10 G @ 10 kg ha-1 or cartap 4 G @ 25 kg ha-1 or fipronil 0.3 G @ 25 kg ha. –1 or chlorpyriphos 10G @ 10 kg ha-1.

2. Spray quinalphos 25 EC @ 1600 ml ha-1 or monocrotophos 36 WSC @ 1100 ml ha-1or chlorpyriphos 20 EC @ 2000 ml ha-1or

File Courtesy: 
ZARS, Mandya
19
Jul

Life Stages of Paddy Stem Borer

Egg: Eggs are creamy white, flattened, oval and scale like and laid in mass. Each egg mass consists of 15-80 eggs and covered with buff coloured hairs. Before hatching, the eggs darken to a purplish tinge. They are laid mostly near the tip of the leaves.

File Courtesy: 
ZARS, Mandya
19
Jul

Paddy Stem Borer

Order: Lepidoptera

Family : Pyraustidae

Scientific name : Scirpophaga incertulas

Local name:

File Courtesy: 
ZARS, Mandya
19
Jul

Symptoms and Nature of damage of Earhead bug/ Gundhi bug

Symptom of attack of Earhead bug/ Gundhi bug : Leaves turn yellow and later rusted from tip downwards. Appearance of numerous brownish spots at the feeding sites / shrivelling of grains.

In the case of heavy infestation, the whole earhead may become devoid of mature grains. Its presence in the field is made out by its strong smell.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
CRRI
19
Jul

Control of Earhead bug/ Gundhi bug

1. Spray monocrotophos 36 WSC @ 1500 ml ha-1 or endosulfan 35 EC @ 1500 ml ha-1or carbaryl 50 WP @ 1500 g ha-1during afternoon hours.

2. Dust malathion or carbaryl @ 30 kg of the formulation/ha.

File Courtesy: 
ZARS, Mandya
19
Jul

Life stages of Earhead bug/ Gundhi bug

Egg: Eggs are circular, brownish seed like, 2 mm long, laid in clusters in two rows along the midrib on the upper surface of the leaf-blade.

Nymph: First instar is small, 2 mm long, pale green in colour, which grows to deepen green through different instars.

Adult: Adults are greenish yellow, long and slender, above ½ inch in length with a characteristic buggy odour.

File Courtesy: 
ZARS, Mandya
19
Jul

Earhead bug/ Gundhi bug

Order: Hemiptera

Family : Alydidae

Scientific name : Leptocorisa acuta

Local name:

File Courtesy: 
ZARS, Mandya
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