How to Treat Pear Tree Chlorosis? Detailed Explanation of Prevention and Control Methods

Pear tree chlorosis is a physiological disease caused by iron deficiency. When this happens, corresponding measures should be taken.How to treat pear tree chlorosis?

1. Causes of pear tree chlorosis

Pear chlorosis is a physiological disease caused by iron deficiency. Generally, soil is rich in iron, but in alkaline soil, large amounts of soluble ferrous iron are converted into insoluble ferric salts and precipitate, and cannot be absorbed and utilized, thus causing pear trees to show iron deficiency (yellow leaves). In addition, heavy application of quick-acting nitrogen fertilizer leads to soil compaction and also causes iron to be fixed. Sandy soil has strong permeability, iron is easily lost, and the disease is severe; in spring, branches and leaves grow vigorously, the demand for iron is large, and iron deficiency is easily caused; low-lying terrain, heavy clay soil, and poor drainage make the disease severe.

2. How to treat pear tree chlorosis

1. In spring, irrigate to wash away salt, drain accumulated water in time, control the rise of salt, and increase the application of organic fertilizer and green manure in the orchard to improve the soil.

2. Before pear trees sprout, for each large tree use 0.5-1kg of ferrous sulfate or chelated iron mixed with 5 times the amount of organic fertilizer and apply it into the soil, then irrigate after application. Spray the branches and trunk with a 0.3-0.5% ferrous sulfate solution, or make a mixed solution of ferrous sulfate, copper sulfate, quicklime, and water at a ratio of 1:1:2.5:300 and spray it. This has a significant effect on controlling the occurrence of the disease, but the duration is relatively short.

3. After pear trees sprout in spring, spray a 200-fold aqueous ferrous sulfate solution, or use a powerful trunk injector to inject a 100-fold acidified ferrous sulfate solution into the trunk, using 20-30g of ferrous sulfate per tree. After success, adopt it on a large scale to prevent relatively large losses.

4. If chlorosis is found during the growing period, iron fertilizer can be sprayed in time for treatment, generally once every 7-10 days, until the leaves turn green. Suitable agents include 200-300-fold quick-acting iron solution, 500-600-fold Huangyeling solution, 200-300-fold ferrous sulfate solution, etc. When spraying, about 1% urea can be appropriately added to the solution.

The prevention and control methods for pear tree chlorosis are mainly adjustments in fertilizer supply and iron supplementation.