What Causes Grapes to Have Yellow Leaves
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What Causes Grapes to Have Yellow Leaves
Grape yellowing leaves are caused by improper fertilization and pesticide use. Pay attention to supplementing trace elements for grapes, control the concentration and amount of fertilizer, and try to avoid direct contact between fertilizer and roots. After fertilizer damage occurs, immediately dig out the excess fertilizer and water abundantly to dilute it. If excessive pesticides are used, flood the field with water to remove pesticide residues.
Reasons for Grape Yellowing Leaves
1. Grape Deficiency in Elements
Uneven grape fertilization, high dependence on nitrogen fertilizer, neglecting the supply of other nutrients, can lead to a deficiency of trace elements such as iron, magnesium, potassium, and boron in grapes. This affects the plant's absorption of nutrients, pollutes the soil, and causes the leaves to turn yellow, presenting an unhealthy state.
2. Pesticide Damage
When grapes are prevented from diseases and pests or weeding, pesticides are generally chosen to be sprayed. However, if used improperly, the grapes will be damaged by pesticides, leading to yellowing leaves, falling leaves, and even fruit drop, reducing yield, and in severe cases, causing plant death.
3. Fertilizer Damage
Improper application of fertilizer can also cause grape leaves to turn yellow. Fertilizer damage usually manifests on the plant's leaf surface and sometimes on the roots and new shoots. Overuse of fertilizer during topdressing, high fertilizer concentration, and incompatible fertilizer properties can harm the plant.
Methods to Treat Yellowing Grape Leaves
1. Timely Fertilization: Pay attention to supplementing trace elements for grapes. Whether it's organic or inorganic fertilizer, chemical or microbial fertilizer, it should be used reasonably to ensure the plant receives comprehensive nutrition.
2. Reasonable Pesticide Spraying: After spraying pesticides on grapes, inspect the orchard. If plants show abnormal states, promptly spray diluted drugs. If it's a herbicide, flood the field with water to remove pesticide residues.
3. Reasonable Fertilization: When fertilizing grapes, control the concentration and amount of fertilizer, and try to avoid direct contact between fertilizer and roots. After fertilizer damage occurs, immediately dig out the excess fertilizer, water abundantly to dilute it, and carry out tillage to loosen the soil.
Prevention and Control of Yellowing Grape Leaves
Grapes have a certain drought tolerance, and there is no need to water them frequently during breeding. Even in the growing season, you can wait until the soil is completely dry before watering. Frequent watering, which cannot be absorbed, can actually affect growth. Moreover, grapes have a high demand for fertilizer during the growing period and should be fertilized reasonably.
Have you understood the detailed introduction of the causes of yellowing grape leaves mentioned above?