Hello everyone/ Assalamu alaikum!
I am growing garlic in my area (Peshwar, khyber Pakhtunkhwa provice of Pakistan). All the macro and micronutrients are also applied to the field. 40 days after germination of garlic, some of the plants leaves became yellow (started from tip). The same case was observed everywhere in Pakistan. I need to know the causes and consequences of this problem????
Pictures are attached here for understanding the problem
Please take a look at these useful links.
https://www.gardenguides.com/causes-tips-garlic-plants-turn-yellow-early-season-9589.html
http://greyduckgarlic.com/frequently-asked-garlic-questions.html
For a better diagnosis, you should do a soil test and check the soil
To maintain steady moisture levels in the soil, mulch your plants. While yellowing leaves are a sign that garlic (Allium sativum) is ready to harvest, yellowing leaf tips early on in the season are an indication that the garlic has growing problems likely invisible above ground. https://www.gardenguides.com/causes-tips-garlic-plants-turn-yellow-early-season-9589.html
Yellow tips can be due to a nitrogen or sulfur deficiency BUT often they are due to heavy frost. ... Root rot can occur in over watered garlic, garlic in poor draining soil or in places where a hurricane has unleashed its damage. http://greyduckgarlic.com/frequently-asked-garlic-questions.html
The most common reason that plants' leaves turn yellow is because of moisture stress, which can be from either over watering or under watering. If you have a plant that has yellow leaves, check the soil in the pot to see if the soil is dry. https://www.ambius.com/indoor-plants/why-plants-turn-yellow/
Rust is a disease that most often occurs on garlic, but is also found on onions, leeks, shallots, and wild allium varieties. This disease begins with the appearance of small, reddish-orange spots on the plant leaves. Leaves may turn yellow if they become more severely infected. White rot is primarily found on onions and garlic and can be identified by yellowing leaves and white, fuzzy growth on the bulb. This disease is typically seen midway through the growing season until harvest time. Both of these diseases favor high humidity and cool temperatures. Rust is found in areas with lower rainfall, while white rot prefers moist conditions. https://homeguides.sfgate.com/causes-tips-garlic-plants-turn-yellow-early-season-75105.html
check the root it might be infected with nematode or root infecting fungi.
good luck
There are two possible reasons for yellowing
1. nitrogen deficiency
2.Heavy frost.
I dont think this yellowing patrern is consistant with rust.
I should suggest that do soil test maybe there is something and also check the pathogens in surrounding area.
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