Beef Flavored Seasoning,Strong Beef Flavor Seasoning,Beef Extract Nutritional Foods,Beef Bone Extract Extract Nutritional Food Hunan Jiapin Jiawei Biotechnology Co. , https://www.foxfoodie.com
Identification of apple diseases caused by lack of factors
Apple orchards often suffer from physiological disorders caused by nutrient deficiencies in the soil or tree imbalances, which can hinder growth and development. These issues lead to abnormal symptoms in branches, leaves, and fruits, ultimately affecting yield, appearance, and fruit quality. Common conditions include apple leaf spot disease, yellow leaf disease, fruit shrinkage, and bitter pit disease.
Apple leaf spot disease is primarily caused by a lack of zinc in the soil. It commonly occurs in sandy or alkaline soils. The disease affects new shoots and leaves, causing them to be narrow, elongated, and curled upward. Leaves become hard, brittle, and pale yellow-green, sometimes with uneven coloration and clustered growth. Affected trees show stunted growth, reduced flowering buds, and small, deformed fruits. Root development is poor in young trees, while older trees may have root rot and sparse canopies, leading to low yields.
Yellow leaf disease results from iron deficiency, especially in saline or calcareous soils. Seedlings and young trees are most affected. Symptoms start at the tips of new shoots, where leaves turn yellow but retain green veins, creating a net-like pattern. As the disease progresses, leaves fall prematurely, and shoot tips die back. This condition is more severe in upper parts of the canopy and significantly impacts fruit set and quality.
Apple fruit shrinkage is caused by boron deficiency, commonly found in mountainous or sandy soils, especially during dry years. It affects both fruit and foliage, leading to early fruit drop and reduced yield. There are three main types: dry-spot, cork, and rust. Dry-spot type appears shortly after flowering, with brown spots on the fruit’s shaded side that eventually become shriveled and hard. Cork type causes soft, brown, and bitter areas inside the fruit, while rust-type shows brown horizontal stripes on the surface without necrosis.
Fruit shrinkage also affects branches and leaves. Blight type causes yellowing and distortion of leaves, with necrotic spots at the tips. Arbuscular type leads to dead shoots and excessive twig growth. Tufty leaf type results in short internodes and clustered, thick leaves, severely impacting tree structure and fruit bud formation.
Apple bitter pit disease is due to calcium deficiency, often linked to over-pruning, excessive nitrogen, or poor nutrition. It mainly affects varieties like Guoguang, Green Banana, Gold Crown, and Red Star. Symptoms appear near maturity and worsen during storage. Early signs include dark lenticels with brown lesions, followed by spongy, bitter tissue. In later stages, bacterial infections may cause rot, further reducing fruit quality.