What are the common pest and disease control methods for navel oranges?

The navel orange is a fruit we are all fairly familiar with. It tastes good, is rich in nutrients, and also has high value as a food therapy. Navel orange cultivation is also quite common, with good growing returns. However, the harm caused by pests and diseases during cultivation often affects its yield and quality. So what are the common pests and diseases of navel oranges? Let's take a look at its pest and disease control methods.

1. Huanglongbing (citrus greening disease)

Huanglongbing is one of the more serious diseases harming citrus fruits during production, hindering the development of the navel orange growing industry. The pathogen is a Gram-negative bacterium. In the early stage of the disease, one or more shoots of the canopy show yellowing leaves, and its symptoms have three different manifestations. After the plant is infected, its vigor weakens, yield decreases, and fruit quality is poor, until the plant withers and dies. This disease is mainly spread through diseased seedlings, scions, and insects.

Control methods: Focus on prevention. Clear weeds and diseased and damaged branches from the orchard and burn them in a centralized pile or bury them deep. Choose disease-free seedlings for planting. When diseased plants are found, pull them out promptly and burn them, and disinfect the diseased planting holes. Alternatively, inject the diseased plants with 1000 ppm tetracycline hydrochloride or penicillin, which has a certain therapeutic effect.

2. Citrus canker

Citrus canker is a common disease in navel orange production. It mainly harms the leaves and fruits of navel oranges, and after onset it often triggers leaf drop and fruit drop, causing yield to drop sharply. After the fruit is infected, its surface becomes extremely rough and its appearance is very poor; some cannot even be sold. During fruit storage it also easily leads to rotting, affecting the economic returns of fruit growers. When leaves are infected at the seedling stage, it causes severe leaf drop and withered shoots, leading to weakened tree vigor, and in severe cases, plant death.

Control methods: Strengthen orchard management to reduce pathogenic bacteria. When planting, apply more organic fertilizer and phosphorus and potassium fertilizer to improve the plant's disease resistance. After harvest, promptly prune away diseased branches and leaves, then gather fallen leaves and diseased fruit on the ground together and burn them. For old branches with disease spots, scrape off the spots, then apply lime sulfur mixture; spraying the trunk with lime sulfur mixture solution gives a relatively good therapeutic effect.

3. Anthracnose

Anthracnose is an infectious disease and also has a relatively long incubation period. It harms branches, leaves, and fruits, and sometimes also harms branches and flowers. In severe cases it causes leaf drop and withered shoots, bark cracking, and fruit rot, leading to total crop loss. When leaves are affected, irregular grayish-white disease spots appear, ultimately causing the leaves to wither and fall off; when fruit is affected, yellow-brown disease spots appear on the surface, the spots gradually expand, and finally the affected area rots.

Control methods: In winter, do a good job of clearing the orchard. Collect all fallen leaves, fallen branches, and fallen fruit on the ground and bury them deep or burn them to reduce pathogens, and spray good disinfection and sterilization agents in winter and early spring. Strengthen fertilizer and water management in the orchard to boost tree vigor and improve disease resistance. Fertilization should be mainly organic fertilizer, with little or no chemical fertilizer. Never apply nitrogen fertilizer in a one-sided way. Prune reasonably to increase air and light penetration between plants and reduce the occurrence of pests and diseases.

4. Pests

The main pests of navel oranges are red spiders, scale insects, and owlet moths. They all cause damage to the leaves, flowers, and fruits of navel oranges, and like to suck the sap from the plant's young and tender parts, causing damage to the growing points of the planting, resulting in slow or stalled growth. In severe cases they cause leaf drop and fruit drop, and may also lead to plant death, causing great harm.

Control methods: Pest control methods should combine agricultural measures with chemical agents. Do a good job of clearing the orchard to reduce pest sources, and spray agents promptly.

The above are the common pest and disease control methods for navel oranges. We hope this helps you. If you want to learn more about navel orange cultivation, please stay tuned to us.