What causes yellowing leaves on cherry trees?
Growing cherries can bring considerable returns, but a series of problems need to be solved along the way. What is going on with yellowing cherry leaves?
1. What is going on with yellowing cherry leaves
Cherry leaves can turn yellow for a number of reasons, and we can look at this from the following aspects.
1. Caused by lack of water
When the climate is severely dry and short of water, the fruit tree suffers from an insufficient water supply, and the leaves then dry out and turn yellow due to lack of water.
2. Caused by fertilizer burn and pesticide burn
Applying too much fertilizer, or fertilizing too close to the root system, or spraying pesticides at too high a concentration or in too large a dose, can all cause the leaves to turn yellow; the most visible sign is that the leaf tips and leaf edges turn yellow and later take on a rusty color.
3. Caused by pests and diseases
Attack by fungi and viruses causes yellowing to varying degrees. The main signs are leaves with alternating dark and light yellow, with indistinct edges; striped spots, yellowing and loss of green along the leaf veins, with fairly wide bands or fine dense reticulation; and bright yellow patches of varying size with clear edges.
Fruit trees attacked by insect pests also develop yellow leaves.
4. Caused by lack of elements
Cherry trees need a variety of trace elements to support them during growth. A lack of a given element produces different reactions. With nitrogen deficiency, the old leaves lose green and turn yellow, and finally drop off; with iron deficiency, the new leaves at the top of the shoots are yellow or yellow-green except for the veins, which stay green; with zinc deficiency, the veins are normal while the leaf tissue turns yellow.
2. How to prevent and control yellowing cherry leaves
1. Preventing lack of water: manage water well in dry weather, water in time and keep the soil supplied, but do not water too much at one time; after irrigation, loosen the soil appropriately to keep the soil airy, and in the rainy season pay attention to drainage so that water does not accumulate and rot the roots and cause disease.
2. Preventing fertilizer burn and pesticide burn: when fertilizer burn or pesticide burn occurs, irrigate in time to dilute the concentration of the pesticide and fertilizer and reduce the damage, or spray a growth regulator to relieve it, which gives a fairly good effect.
3. Preventing pests and diseases: pests and diseases must be controlled in time; you can spray the foliage with 25% tebuconazole at 4000 times + Kejunkang at 1000 times + Aizengmei 30 jin water/5 ml, + amino acid foliar fertilizer 500, spraying the whole tree, then spray again after ten days; for insects add Taoxiaoling.
4. Preventing lack of elements: for yellow-leaf symptoms caused by lack of elements, the best control measure is to supplement the corresponding element so that the tree recovers; for yellow leaves caused by a lack of various elements, supplement the elements in a targeted way, and the needed elements can be supplied by means of foliar fertilizer.
Judge according to the situation which cause is making the leaves turn yellow, and only then can you grow cherries of good quality.