The main pests and diseases of Gannan navel orange are citrus psyllids, red spiders, rust ticks, yellow dragon disease, anthrax, sand skin disease, etc., these diseases and insect pests threaten the growth and fruit yield of Gannan navel orange plants in all aspects, so today look at the Gannan navel orange disease and pest control measures to learn about it.
1. The main insect pest of Gannan navel orange
1.1 Citrus psyllids
Harm: Wood lice suck navel orange shoots, young shoots, young leaves, causing young shoots, young shoots yellow flowers, shrinking and drying, young leaves deformed and fall off.
Prevention and control measures: do a good job in the prevention and control of wood lice in the spring, summer and autumn stages; use the natural enemy ladybirds of wood lice, aphid-eating flies, jumping wasps and praying mantises to eliminate wood lice; do a good job in clearing the garden in winter, reduce overwintering adults, and reduce the population base of insects.
1.2 Red Spider
Harm: Mainly harmful to navel orange leaves, young branches and fruits, in severe cases, it will cause fruit trees to fall leaves and fruits, affecting tree potential and yield.
Prevention and control measures: before the peak, reduce the insect population base; the use of red spiders' natural enemies, six-point thrips, predatory mites, etc., to eliminate red spiders; red spiders have strong resistance, so when using drugs for prevention and control, we must pay attention to rotating drugs to avoid resistance.
1.3 Rust ticks
Harm: Mainly harmful to the fruit and leaf back of citrus, in severe cases, it will cause the leaves to fall off, and the fruit epidermis will become rough, affecting the quality of the fruit.
Prevention and control measures: In the early stage of the peak of rust tick damage in May and July, timely spray prevention and control, spray control should pay special attention to spraying the lower part of the canopy, the back of the leaf surface, and the shady side of the fruit; timely irrigation during high temperature and drought in the middle of summer, so that the occurrence of rust ticks can be controlled.
1.4 whiteflies
Harm: The whiteflies that harm Gannan navel orange are mainly citrus whitefly and black whitefly, which will gather on the back of young leaves to suck sap, and in severe cases, it will cause leaf deformities and fallen leaves, causing dead shoots.
Control measures: Do a good job in the prevention and control of the first half of the year, focusing on the prevention and control of adult overwintering generations and nymphs of each generation.
2. The main disease of Gannan navel orange
2.1 Huanglongbing disease
Harm: Huanglong disease is a disease that is devastating to citrus crops caused by the infestation of phloem bacilli, and when severe, it will cause the whole tree to decline and die.
Prevention and control measures: strict plant quarantine, the establishment of disease-free nurseries, the cultivation of disease-free seedlings; strict prevention of diseased seedlings and diseased fruit output; do a good job in prevention and control, timely inventory of orchards, found that diseased trees should be dug up in time to prevent infection.
2.2 Ulcer disease
Harm: Mainly harmful to the young leaves, young shoots and young fruits of navel oranges, which will lead to the fall of navel orange leaves and fruits when severe, and the treetops will die.
Prevention and control measures: the best time is the greening period of spring leaves, the leaf spreading period and the young fruit stage of summer and autumn shoots; do a good job in the prevention and control of pests such as leaf-diving moths and mites; in the process of planting management, it is necessary to reduce wounds and enhance tree potential.
2.3 Anthrax
Harm: Mainly harmful to navel orange leaves, branches, flowers, fruits and fruit stalks, causing a large number of leaves, fruit fall, branch death, severe can cause the death of the whole plant.
Prevention and control measures: strengthen cultivation management, enhance tree potential, improve disease resistance; do a good job in winter garden clearance, remove diseased insect branches and leaves, dead branches and leaves; strengthen fertilizer and water management, prevention and control is mainly prevention.
2.4 Sandspring disease
Harmful: Mainly harmful to the leaves and fruits of navel oranges.
Prevention and control measures: strengthen production management, enhance tree potential, improve tree disease resistance; pay attention to antifreeze, drought and flooding, sunburn.
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