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12
Jul

Management of Rice swarming caterpillar

Chemical control: Spraying of Super D (Chlorphyriphos 50% + Cypermethryn 5%) or Nural D 55 EC @ 1.25 liter in 500 liter water for 1 ha give positive results.
12
Jul

Biology of Rice swarming caterpillar

1. Egg: Eggs are spherical and creamy in colour, which are laid in a group covered over with grey hairs. 2. Larva: The caterpillars are light green with yellowish white lateral and dorsal stripes in the early stages and later become dark brown or grayish green in colour with a crescent (semi-circular) shaped black spot on the side of each segment (Fig. 10
12
Jul

Nature of damage of Rice swarming caterpillar

1. Caterpillars march in large numbers in the evening hours and feed on the leaves of paddy seedlings till the morning and hide during daytime. 2. They feed gregariously and after feeding the plants in one field march onto the next field. Under severe infestation crop gives the appearance of grazed plants. 3. Attacked plants are reduced to stumps. Nurseries situated in ill-drained marshy areas attacked are earlier than dry ground. Damage is severe during July to September.
12
Jul

Symptom of attack of Rice swarming caterpillar

Nurseries found completely eaten away by the caterpillars’ overnight.
12
Jul

Rice swarming caterpillar

Latin name: Spodoptera mauritia, Noctuidae, Lepidoptera Common name: Species: S. mauritia
12
Jul

Management Rice Gall midge ( Sanrhakeet )

Chemical control: Carbofuran 3G @ 30 kg/ha is found to be highly effective in controlling the insect populations. Resistant variety: Lalat and Naveen are found to be resistant to this insect in Jharkhand state.
11
Jul

Biology Rice Gall midge ( Sanrhakeet )

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. Adult: The adult fly is yellowish brown
11
Jul

Nature of damage Rice Gall midge ( Sanrhakeet )

1. The maggot bores into the growing point of the tiller and causes abnormal growth of the leaf sheath, which becomes whitish tubular and ends bluntly. 2. It may be pale green, pink or purplish. Further growth of tiller is arrested. This is called onion shoot or silver shoot. 3. The feeding by the maggot and the larval secretion, which contains an active substance called cecidogen, is responsible for cell proliferation of the meristematic cells and gall formation. 4. It is a pest in
11
Jul

Symptom of attack Rice Gall midge ( Sanrhakeet )

1. The central shoot instead of producing leaf produces a long tubular structure. 2. When the gall elongates as an external symptom of damage, the insect will be in pupal stage and ready for emergence
11
Jul

Rice Gall midge ( Sanrhakeet )

Latin name: Orseolia oryzae, Cecidomyiidae, Diptera Common name: Sanrhakeet Species: O. oryzae
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