These days, many growers and friends have consulted the yellowing of garlic seedling leaves, and in the face of this situation, they do not know how to manage. In view of this situation, we first need to analyze what causes the leaves of garlic seedlings to turn yellow, and then manage them, which will have a multiplier effect with half the effort! So what causes garlic seedlings to turn yellow?
In this season, the leaves of garlic seedlings are yellow, and it is easy to think of insect pests, what is the pest? According to the occurrence of garlic insect pests throughout the country, it is speculated that it is a maggot hazard!
Maggots
Symptoms: Maggots nibble on garlic root tubers, which will cause garlic seedling leaves to turn yellow, often starting from the lowest leaf, pulling out the plant can see maggots, if not prevented early, it will cause garlic seedlings to die!
Prevention and control program: In view of this situation, it is recommended that growers wash drugs for control, use 20% thiamethoxamine 500ml + 10% pyridoxine 100ml per acre of land, insecticide and egg killing, tube time is long!
Garlic seedling leaves yellow, not to mention the disease problem, especially the greenhouse planting garlic seedlings, will occur bacterial soft rot, blight, leaf blight these three diseases, will lead to garlic leaves yellowing.
Symptoms: After the emergence of bacterial soft rot, from the lower leaves gradually yellow, the leaves are soft and yellow, when the humidity is large, the disease site will appear decay symptoms, accompanied by a pungent odor (the root system is also very obvious);
Bacterial soft rot
After the emergence of the disease, water-stained dark green spots can be seen on the leaves, and from the top of the leaves, it begins to turn yellow, and there is a gray-white mold layer at the site of the disease when the humidity is high;
Leaf blight also begins at the top of the leaf and spreads quickly, with dry and yellowish appearance in the middle of the leaf in the later stage.
Prevention and control plan: For the bacterial soft rot disease of garlic, it is recommended that growers use pentetracycline, copper hydroxide and copper thiomycete spray for prevention and control; for epidemic diseases, it is recommended to spray oxazolone, downy mildew, and urea. Manganese zinc and other control; for leaf blight, it is recommended to use phenyl ether methylcyclazole and pyrazole. Pentrazole and other prevention and treatment.
In addition to pests and diseases, some external environmental factors can also cause yellowing of garlic seedling leaves, such as low temperature frost damage, herbicide damage, soil drought, defertilization, etc. For these situations, it can be alleviated by using some agents that improve crop stress resistance!
Solution: First of all, you can alleviate the yellow leaf situation by foliar spray nutrients, here is a recipe (mu dosage):
10% amine fresh esters. Gibberellin 5 g + amino acid foliar fertilizer 20 ml + potassium dihydrogen phosphate 100 g
This formula can significantly improve the stress resistance of garlic plants, so that the plants can resist low temperatures, drought, and can also detoxify, fertilize and promote rooting.
Secondly, you can also alleviate the yellow leaves by flushing nutrients with water, it is recommended to choose high potassium compound fertilizer, 15-20kg per acre of land; at the same time, with amino acids, fish protein, etc., to promote rooting, nutrition, yellow leaf conditions will naturally be improved!
This year, the temperature is relatively low, garlic planting is relatively late, the probability of disease occurrence will not be too high, mainly insect pests and external environmental factors caused by yellow leaves. It is recommended that growers must pull out the plants to check before medication management, and to determine that there are no insects, they can control the spread of yellow leaves by spraying protective fungicides with nutrient regulators to ensure the normal growth of garlic seedlings. Today's explanation of the reasons for the yellowing of garlic seedlings is so much, welcome to guide the comments!