PESTS OF RICE (BORERS AND FOLIAGE FEEDERS) :: Major Pests :: Leaf Folder
4. Leaf folder (or) leaf roller: Cnaphalocrocis medinalis (Pyralidae: Lepidoptera)
Distribution and status: India, Sri Lanka, China, Japan, Madagascar, New Guinea, Pakistan, Bangladesh, South East Asia, Korea.
Damage symptoms: The caterpillar folds the leaves longitudinally and remains inside. It scrapes the green tissues of the leaves and makes them white and dry. During severe infestation the whole field exhibits scorched appearance. |
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ETL
10% damaged leaves in vegetative stage
5% damaged leaves (flag leaf) in flowering stage
Bionomics: The adult moth is often seen in the field during daytime. The moth is brownish with many dark wavy lines in centre and dark band on margin of wings. The female moth lays eggs in batches of 10-12, which are arranged in linear row in the lower surface of leaves. The eggs are flat, oval in shape and yellowish white in colour. The egg period is 4-7 days. Larva is 15-20 mm long, pale green, transparent, actively moving caterpillar. The larval period is 15-20 days. It pupates inside the leaf fold. The pupa is greenish brown. The pupal period is 6-8 days. Total life cycle: 25-35 days.
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Management
- Use resistant varieties like TNAU LFR 831311, Cauvery, Akashi, TKM-6, IET 7511, IET 9225 and IET 9797, ASD 20, VC Dhan 221, PTB 12, PTB 20, PT 321, H 4
- Clipping of affected leaves reduces the pest population.
- Trim the bunds and remove grassy weeds.
- Avoid use of excessive nitrogenous fertilizer.
- Set up light traps to attract and kill the moths.
- Release Trichogramma chilonis thrice on 37, 44 and 51 DAT followed by three sprays of monocrotophos 36 SL 1.0 L/ha on 58, 65 and 72 DAT.
- Apply benfuracarb 3 G 3.3 kg or cartap hydrochloride 4 G 1.875 - 2.5 kg /ha
- Spray any of the following insecticide in 500 L water/ha
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