A Detailed Guide to the Latest Control Methods for Yellowing Leaves in Garlic Chives
Garlic chives are a common crop in our daily lives, rich in nutrients and deeply loved by consumers, but during cultivation, yellowing leaves can occur, causing severe yield reductions and even total crop failure in serious cases. So how should yellowing leaves in garlic chives be controlled? Let's find out together.
1. Yellowing leaves caused by diseases
The main diseases causing yellowing leaves in garlic chives are phytophthora blight and gray mold. After garlic chives are infected with phytophthora blight, water-soaked lesions appear, and the lesions develop a white mold layer when humid and turn withered yellow when dry. When gray mold occurs, white or light brown lesions appear on the leaves, and as the disease progresses, the lesions gradually expand, ultimately causing the diseased leaves to dry up, with a grayish-green mold layer appearing on the diseased leaves in humid conditions.
Control methods: The occurrence of phytophthora blight is related to drainage, so during cultivation, drainage should be done well to reduce humidity. When the disease occurs, metalaxyl and metalaxyl-mancozeb can be sprayed for control. For gray mold, in addition to drainage, triadimefon and procymidone can also be sprayed for control.
2. Yellowing leaves caused by insect pests
The insect pests include root maggots, onion flies and late eye fungus gnats. Root maggots burrow into the bulbs to feed, and the affected bulbs are damaged by the root maggots, causing the leaves to rot, turn yellow and die. Onion flies damage as larvae, gnawing on leaf tissue, causing leaves to turn yellow, soften and lodge; the same is true for late eye fungus gnats, which suck leaf sap, causing the leaves to lose water, turn yellow and die.
Control methods: For root maggots, roots can be exposed to the sun, wood ash can be applied, or phoxim granules can be mixed with soil and spread around the root system to kill them; for onion flies, during the larval stage, phoxim emulsifiable concentrate or quinalphos emulsifiable concentrate can be used to drench the roots, and during the adult emergence period, imidacloprid can be sprayed for control; adult late eye fungus gnats prefer to rest in shaded, humid places with abundant decaying matter, and can be trapped and killed with frequency-vibration insect-killing lamps.
3. Physiological diseases
Yellowing leaves in garlic chives can also be caused by soil acidification, nitrogen poisoning, high temperatures above 35 degrees, and low temperatures, and can also be related to a lack of trace elements such as calcium, boron and manganese in the plants.
Control methods: Apply as little acidic fertilizer as possible to avoid causing soil acidification; if the soil is too acidic, it can be adjusted with wood ash; organic fertilizer must be fully decomposed before application; in summer high temperatures, water should be sprayed promptly to cool down, and in winter, insulation measures should be taken well. Before planting, apply base fertilizer, mainly organic fertilizer and farmyard manure, to provide the plants with various essential nutrients; during the growing period, foliar spraying can be used to provide the plants with the needed trace elements.
The above is an introduction to how to control yellowing leaves in garlic chives. We hope it can help you. To learn more related knowledge, please stay tuned to us.