What to do when garlic sprouts have yellow leaf tips over a large area? Causes and control methods
Garlic sprouts have a wide planting area and obvious economic returns, but yellow leaves occur during the growing process. This is common in production, but if yellow leaves occur over a large area, it will have a huge impact on the yield of garlic sprouts. So what causes garlic sprout leaf tips to turn yellow over a large area? Let's learn about it together.
1. Continuous cropping
Garlic is not suitable for continuous cropping. Generally, continuous cropping should not exceed two years. Once continuous cropping exceeds two years, degeneration will occur. Not only will yield and quality decline year after year, but the leaf tips of garlic sprouts will also turn yellow early and then gradually spread upward, causing large-area yellow leaves in garlic sprouts. Yellow leaves caused by continuous cropping generally show weak root growth. For this situation, on the one hand, topdressing is needed to promote root growth and development; on the other hand, plant growth nutrient solutions such as 2003 and Bihu can be sprayed, which can also promote root growth and alleviate yellow leaves.
2. Damage by underground pests
Common underground pests of garlic include root maggots, white grubs, cutworms, and others. They often bite off the garlic roots and even bore into the garlic cloves, causing the cloves to rot, resulting in yellow leaves on the aboveground parts. For this situation, 80% dichlorvos 1000-fold solution or 50% phoxim emulsifiable concentrate 800-fold solution can be used to drench the roots and divide plants, or 50% phoxim emulsifiable concentrate can be mixed with soil at one jin per mu to make medicated soil, spread between the rows, and then irrigated so that the pesticide infiltrates underground with the water to control the pests.
3. Mother bulb degeneration
Mother bulb degeneration is a normal physiological phenomenon. It marks that the stored nutrients of the seed garlic have been exhausted and that bolting and flowering are about to begin. Therefore, 30-40 days after garlic sowing, before mother bulb degeneration, 20-25 kg of urea and 15-20 kg of potassium sulfate should be topdressed per mu. If conditions permit, 3-5 kg of special compound fertilizer for garlic can also be added. If chemical fertilizers are not used, 2000-5000 kg of decomposed high-quality farmyard manure per mu can be applied directly.
The above is an introduction to what to do when garlic sprouts have yellow leaf tips over a large area. We hope it can help you. To learn more related knowledge, please continue to follow us.