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What is the main characteristic of Ufra-I caused by Ditylenchus angustus in rice?
EXPLANATION
Nematode Parasites of Cereals, Millets, Pulse
- Ufra Disease Symptoms in Rice (Ditylenchus angustus):
- Symptom Complex: Ditylenchus angustus is an obligate ectoparasitic foliar nematode infesting deepwater/lowland rice.
- Ufra-I vs Ufra-II:
- Ufra-I (Early attack / 'Pucca Ufra'): Nematodes feed on developing vegetative growing points and floral primordia inside the leaf sheath. At heading time, the emerging ears are completely trapped inside the twisted, crinkled boot leaf; the panicle fails to emerge, producing 100% sterile grain loss.
- Ufra-II (Late attack): Panicles emerge partially with twisted peduncles and partially filled grains.
- Conclusion: The primary feature of Ufra-I is that the panicle fails to emerge (Option 1).
Correct option: (1) Panicle fails to emerge
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