I do experiments with garlic in vitro and green house. I observed that garlic trees stopped growing, turned yellow in leave tips and wilted leaves. Is that natural physiology of garlic or abiotic /biotic stresses?
Dear Thắng Nguyễn Phước Quý in some way, it's the "usual" behavior of garlic. However, if garlic plants are passing through stressful situation, these signs could appear before and/or with more intensity, causing death in ocassions.
Over-watering can lead to yellowed foliage when the soil becomes waterlogged because it causes the plants suffocate and die, leading to yellowed leaves.
https://homeguides.sfgate.com/causes-tips-garlic-plants-turn-yellow-early-season-75105.html
The most common causes of yellowing garlic leaves are cold temperatures, disease, pests, poor plant care, lack of nutrients and soil problems.
https://gardential.com/garlic-leaves-turning-yellow
Dear Thắng Nguyễn Phước Quý . Because of over-watering which can lead to yellowed foliage when the soil becomes waterlogged. This causes the plants suffocate and die, leading to yellowed leaves. See the link: https://homeguides.sfgate.com/causes-tips-garlic-plants-turn-yellow-early-season-75105.html#:~:text=Garlic%20does%20not%20tolerate%20uneven,die%2C%20leading%20to%20yellowed%20leaves.
Also, other causes of yellowing garlic leaves are cold temperatures, disease, pests, poor plant care, lack of nutrients and soil problems. See the link: https://gardential.com/garlic-leaves-turning-yellow
The most common reason for drooping in any plant is lack of moisture in the soil. Garlic requires consistently moist soil. Water the plants with 2 inches (5 cm.) of water at least two times a week.
https://www.gardeningknowhow.com/edible/herbs/garlic/drooping-garlic-plants.htm
Moreover, lack of water will cause falling down and yellow of leaves . See the following useful link: https://www.gardeningknowhow.com/edible/herbs/garlic/drooping-garlic-plants.htm
White rot or basal rot cause the underground heads of garlic to rot, leading to yellowed leaves above ground.
https://www.gardenguides.com/causes-tips-garlic-plants-turn-yellow-early-season-9589.html
Garlics pass through a cyclic wilting of older leaves. This wilting initiate from the tips of leaves to their base. The same behavior can be observed in vitro. Certainly, stressful conditions, can drive to wilting of plants; however, lack of water and rots aren't occurs under in vitro conditions. Here I'm attaching a couple of pictures from garlic either under ex vitro and in vitro conditions, and commercial plantations. If pictures are zoomed, can be observed that well watered and healthy plants showing either the complete wilting of basal leaves and tips.
Surely, the attached file (pdf) can help you understand, why?
Thank you!!
Please it is important to check at lab. first and as my opinion Downy mildew is previling and observed in our garlic filelds with your same symptoms , might your field could have that.
White rot is common, the root system is not working and such disease is soil born,
I guess it might be sclerotia sp.,
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