Why do pepper leaves turn yellow? What are the solutions?
Farmers who grow peppers often run into the problem of pepper leaves turning yellow. So what causes pepper leaves to turn yellow? What should be done about yellowing pepper leaves? To help farmers better understand and master the prevention and control measures for yellowing pepper leaves, this article will walk you through the causes and solutions for your reference.
1. Causes of yellowing pepper leaves
1. Water-induced yellowing. It is caused by watering too frequently; its characteristic is that the old leaves show no obvious change while the young leaves turn yellow; in this case, watering should be stopped immediately;
2. Drought-induced yellowing. It is caused by lack of water and drought; its characteristic is that the old leaves turn yellow first, from the bottom upward, and if the water shortage lasts a little longer, the whole plant will have yellow leaves and may even die, so it should be watered in time;
3. Fertilizer-induced yellowing. It is caused by fertilizing too frequently or at too high a concentration; its characteristic is that the young leaves are thick, glossy and uneven; fertilizer should be withheld, and the soil should be cultivated and watered;
4. Starvation-induced yellowing. It is caused by insufficient fertilizer, too low a fertilization concentration and too long an interval between fertilizing; its characteristic is that the young leaves and tender stems turn yellow first, and if no fertilizer is applied in time after this phenomenon appears, it can also cause the whole plant to have yellow leaves and even die; for flowers lacking fertilizer, never apply a large amount of concentrated fertilizer at one time, so as to avoid burning the roots;
5. Iron-deficiency yellowing of leaves. In greenhouses, woody flowers and the like often show yellowing leaves because the soil fertility conditions vary greatly; its characteristic is that it is obvious on young leaves and milder on old leaves, with the mesophyll yellow and the veins green, forming a typical network; it can be solved by applying a ferrous sulfate aqueous solution, and the method is: 7 parts cake fertilizer, 5 parts ferrous sulfate and 200 parts water made into a diluted solution for watering.
2. Prevention and control measures for yellowing pepper leaves
1. Measures for treating viral diseases in peppers: when preventing viral diseases in peppers, you must first prevent diseases such as white stone powder and pests, because white stone powder or other pests can spread the virus and cause difficulties in treating the plants at a later stage; at this time you can also choose to use chemicals for spraying to carry out prevention and control.
2. Measures for preventing leaf mold. When this disease occurs, it is recommended that you spray with Daconil at 700 to 800 times dilution. Of course, you can also choose other chemicals with good efficacy for spraying, or pepper juice, but you should note that after harvesting the fruit, you must promptly clean up the pathogens in the field and bury them deep or burn them. This reduces the probability of this leaf mold occurring.
3. Measures for preventing whiteflies. When this insect pest, the whitefly, occurs, you can use a small amount of dichlorvos for spraying, or you can choose a pesticide that kills whiteflies for prevention and control.
4. For the measure of treating yellowing branches and leaves caused by drought, you can water the field, but the amount of water must be controlled well; however, you must note that watering should be moderate, and it is best not to water at noon when the weather is relatively good, because that would damage the plant roots; you can also consider applying some fertilizer while watering to supplement nutrients for the plants, and you can also apply foliar fertilizer to the ground.