Explore essential knowledge on protecting ragi crops from pests, diseases, and environmental threats. This quiz covers common risks, prevention techniques, and integrated management strategies for optimal ragi health.
Which pest is known for causing significant leaf damage, leading to 'white ear' in ragi fields?
Explanation: Shoot fly larvae damage ragi seedlings by feeding on the central shoot, resulting in 'white ear' symptoms. Stem borers primarily harm the stem and are more problematic in other cereals. Aphids suck plant sap but don't cause white ears. Cutworms typically attack seedlings at soil level, causing wilt rather than white ears.
What is the most recommended cultural method to reduce the risk of ragi blast disease?
Explanation: Crop rotation helps break the disease cycle of blast-causing fungi by preventing build-up in the soil. Flood irrigation is rarely practiced with ragi and may worsen diseases. Deep plowing can help, but rotation is generally more effective. Late sowing actually increases blast risk due to favorable conditions for the pathogen.
When is the best stage to apply fungicides against fungal diseases like leaf and neck blast in ragi?
Explanation: The booting stage is most susceptible to fungal infection, so timely fungicide application gives optimal protection. Applying before sowing or at harvest offers no disease control. At grain-filling, infection prevention is less effective as much damage is already done.
Why is early manual weeding crucial for young ragi plants during the first 30 days after sowing?
Explanation: Early manual weeding prevents weeds from competing for nutrients, sunlight, and water during ragi establishment. Taste and grain color are not influenced by early weeding. While effective weed management can slightly help irrigation efficiency, the main purpose is competition reduction.
Which IPM approach is especially suited for long-term ragi plant protection against pests and diseases?
Explanation: Using resistant varieties is a core part of integrated pest management (IPM) as it reduces reliance on chemicals and offers sustainable protection. Solely depending on sprays may cause resistance and is less sustainable. Burning stubble is not environmentally friendly. Permanent flooding is not suitable for ragi and can cause root problems.