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20
Jul

Symptoms and Nature of damage of Rice Leaf Folder

Symptom of attack of Leaf folder :

Leaves folded longitudinally or transversely with silk and scrapped patches in such places.

Nature of damage of Leaf folder:

1. The larvae feed by scraping the green mesophyll resulting in linear pale white stripe damage. Starting with the late second instar, when larvae regul

20
Jul

Control of Leaf Folder

1. Early planting may help to avoid greater degrees of leaf damage.

2. Wider spacing and low usage of nitrogenous fertilizers decreases leaf damage.

3. Spray monocrotophos 36 WSC @ 850 ml ha-1or chlorpyriphos 20 EC @ 1500 ml ha-1or cartap 50 WP @ 600 g ha-1 or quinalphos 25 EC @ 1200 ml ha-1or acephate 50 WP @ 700 g ha-1or or fipronil 5 SC @ 600 ml ha-1

20
Jul

Life Stages of Leaf Folder

Egg: Flat oval yellowish eggs laid singly or in pairs on the undersurface of tender leaves.

Larva: Larva is yellowish green in colour and translucent about 16-20 mm long.

Pupa: It pupates inside the fold.

Adult: Adult is small yellow coloured moth with dark wavy lines on both pairs of wings.

20
Jul

Leaf Folder

Order: Lepidoptera

Family: Pyralidae

Scientific name : Cnaphalocrocis medinalis

Local name:

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.

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.

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.

20
Jul

Rice Skipper

Order: Lepidoptera

Family : Hesperidae

Scientific name : Pelopidas mathias

Local Name:

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

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.

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