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Prevent and control pear rust early, so the fruit does not grow warts
The disease that causes warts on pear fruit is called rust, also known as pear rust, pear red rust, or pear-apple-juniper rust. Before the pear trees shed their leaves, in September, the disease successively transfers as mycelium to alternate hosts on juniper (including Chinese juniper and dragon juniper) type trees. As long as juniper type trees are planted, pear orchards have the possibility of rust occurring every year. After leaves are infected, orange-yellow oil-droplet-like small spots appear on the surface, gradually developing into nearly round lesions 4-8 mm in diameter, with orange-yellow small granular spots appearing in the center, which later gradually turn black; the area around the lesion is reddish-brown, the upper leaf surface is sunken, and the back
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Jujube rust mite
Also known as jujube rust mite, jujube bud mite, and jujube gray leaf. This pest is distributed throughout the winter jujube producing areas of Shandong Province and has become one of the main pests on jujube trees. After jujube trees are damaged, the leaves curl, the leaf color turns gray, flowers and fruit drop heavily, and then the leaves fall, causing a second flush of leaves; the fruit surface develops rust spots, causing substantial yield reduction and declining quality. The number of generations of this pest varies with geographic location. In the Zaozhuang area of Shandong, there are about 10 generations per year. It overwinters as adult mites and nymphs in the scales of jujube spurs or in the bark crevices of jujube branches. It is characterized by many generations, rapid reproduction, high mortality, strong stress resistance, rapid spread, and
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Analysis of the Relationship Between Rusty Patches on Pear Fruit Surfaces and Pesticide Use
Irregular rust-colored patches often appear on pear fruit surfaces, affecting the appearance quality of the fruit. Fruit surface rust is generally called fruit russeting, which is formed by the gradual thickening and suberization of cell walls, with epidermal cells and the cuticle rupturing and exposing the surface, forming brown rust-colored patches. Another type of rusty patch is actually "pesticide russeting," caused by improper pesticide use or excessive pressure when spraying pesticides. There is also a type called "water russeting," mainly caused by poor environmental conditions, damp and rainy weather, insufficient light, and mold parasitizing the fruit surface. The occurrence of fruit russeting is related to many factors in cultivation. Such as variety, strain differences
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What are the control measures for citrus rust mites?
Pay attention to inspecting citrus plants. When a rapidly spreading pale yellow powdery layer appears on the leaf and fruit surfaces, when individual black-skinned fruits appear on the citrus plants, or when examination with a 10x magnifying glass reveals 2~3 rust mites per field of view, timely control should be carried out. You can choose M-45 Daconil 600x solution, or 25% azocyclotin 1...
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Identification and Control Methods of Jujube Rust Disease Explained in Detail
(1) Symptoms: Jujube rust disease only damages the leaves. In the early stage, pale green small spots are scattered on the underside of the leaves, later gradually becoming raised and dark yellow, which are the uredinia of the pathogen. The uredinia are irregular in shape and mostly occur on both sides of the midrib, at the leaf tip and base. After the surface of the lesion ruptures, yellow urediniospores are scattered. On the upper side of the leaf, corresponding to the uredinia, green...
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How to prevent and control jujube tree rust disease? Mastering integrated control techniques is key
Jujube rust disease, also known as jujube mist, often causes massive leaf drop during the fruit expansion stage. Diseased trees produce shriveled jujube fruits with reduced sugar content in the flesh, most of which are inedible. Due to the damage caused by rust disease, serious yield reductions occur, variety quality deteriorates, and farmers' economic income is directly affected. Severely diseased trees that drop leaves early will sprout a second time, affecting the...
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How to Remove Kiwifruit Fruit Rust? A Detailed Guide to Practical Methods
1. Site selection: Choose a light hilly area that is sheltered from the wind and faces the sun, with abundant water sources, convenient drainage and irrigation, deep soil layers, and rich humus. Prepare the land with large planting holes 1 m square, applying 50 kg of farmyard manure and 2 kg of decomposed cake fertilizer per hole. 2. Planting technique: Use one-year-old grafted strong seedlings, with a plant-to-row spacing of 3 m...
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How to control papaya rust in papaya tree cultivation?
How to control papaya rust? What harm does papaya rust cause? What methods can control papaya rust? Please provide guidance. The harm of papaya rust: after the leaves are affected, shiny orange-yellow fine spots appear, gradually expanding into round spots about 5 mm in size, and producing yellow slime. The underside of the leaf is raised. And produces gray-yellow...
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