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Detailed Explanation of the Damage Characteristics and Life Habits of the Jujube Gall Midge
The jujube gall midge, commonly known as the leaf-rolling maggot or jujube maggot, damages the young leaves of jujube trees with its larvae, causing the affected leaves to curl lengthwise toward the upper surface. Early-stage curled leaves are purplish-red, while late-stage curled leaves are mostly brownish-green. The damaged leaves gradually wither, scorch and drop off. The jujube gall midge produces 5-6 generations per year and overwinters as larvae in the shallow soil beneath the trees. In late April the larvae begin to curl leaves and cause damage, with early May being the peak damage period. The pupal stage of the first generation occurs in early June, and adults emerge in early June. In the Beijing area, it occurs in large numbers in May and June, causing the most severe damage, and the larvae mature in about 10 days. In late August
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What causes herbicide damage in Schisandra chinensis
Chemical herbicides are widely used because they have the advantages of low investment, quick results and labor savings. The types of herbicides increase year by year, and the application rate keeps rising. Although the agricultural authorities have done a great deal of publicity and training work specifically for farmers on the use of herbicides, recent surveys by the Northern Medicine Office and the Yichun City Plant Protection Station show that, due to the drift of herbicide spray droplets, the problem of damage of varying degrees to nearby planted Schisandra chinensis is particularly prominent. According to the Northern Medicine Office of Tieli City, Heilongjiang Province, and the Taoshan Forestry Bureau
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Many holes and black spots on new cotton leaves? Watch out for tarnished plant bug damage
A text message from mobile phone 139****8164: There are many small holes and many small black spots on the new cotton leaves. What is going on? What pesticide should be used? Answer: It is very likely caused by the piercing-sucking damage of the tarnished plant bug. When the tarnished plant bug pierces and sucks at the growing point at the top of the cotton plant, it causes tissue necrosis and forms needle-point-like black spots. Later, as the healthy tissue grows, irregular holes form in the leaves (their edges heal well, which distinguishes them from perforation caused by disease). The tarnished plant bug is a pest that occurs frequently and in large numbers in cotton production in recent years,
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What Harm Can Herbicide Damage Cause to Schisandra chinensis
I. Soil-residual herbicide damage 1. Symptoms. In the middle of the growing season the leaves wilt, recovering their upright posture in the morning and evening; the plants become rigid and stop growing, similar to drought, and the root system develops slowly. 2. Cause. Damage from triazine, sulfonylurea, imidazolinone and similar herbicides. 3. Preventive measures. (1) Any farmland that has been treated with long-residual herbicides such as triazines, sulfonylureas and imidazolinones must not be planted with Schisandra chinensis within two years. (2) If symptoms are found, drench the roots with COMPO Kapco 500 times dilution, and spray the foliage with Bihu, Yecui
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How to prevent and control the damage of Lijuan spruce tip rust to Meijing?
Meijing tip rust is a newly discovered disease on Qinghai spruce (Picea crassifolia), mainly distributed in spruce forests at altitudes of 2600-2800 m in the eastern section of the northern slope of the Qilian Mountains in western Gansu, harming Qinghai spruce. Its harmfulness is second only to Qinghai spruce needle rust, and its onset period is about one month earlier than Qinghai spruce needle rust. Symptoms: Diseased buds of spruce sprout 10-15 d earlier than healthy buds. Starting in early June, the diseased buds swell into a conical shape, peach-red in color, with densely dotted small protrusions on the surface, which are the fungal spermogonia. New leaves emerging on the tender tips are deformed,
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A Complete Guide to Onion Thrips Damage and Control Methods
I. Distribution and Damage. Onion thrips, also known as tobacco thrips, cotton thrips, etc., belongs to the order Thysanoptera, family Thripidae. It mainly damages onions, scallions, garlic, Chinese chives, cucurbits, eggplant, Chinese cabbage, potatoes, and so on. Both adults and nymphs use their piercing-sucking mouthparts to suck the sap from tender tips and heart leaves of plants. Damaged scallions develop many fine, elongated grayish-white spots, the leaf tips turn yellow and dry up, and in severe cases the leaves become twisted and withered. II. Morphological Characteristics. Adult. Body length 1-1.3 mm, light yellow to dark brown, etc. Wings slender and transparent,
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Differences Between Herbicide Damage and Fertilizer Damage in Azaleas and How to Tell Them Apart
When azaleas suffer herbicide damage and fertilizer damage, they share some characteristics but also differ in their manifestations. What they have in common is that both are physiological injuries, causing leaves to wither and drop within a short time, but the patches do not slowly expand, nor do pathogens appear on them. The differences between herbicide damage and fertilizer damage are as follows: when azaleas suffer herbicide damage, they show sensitivity to a certain pesticide or a certain class of pesticides. For example, after a pesticide is sprayed on the leaves, within a few days the parts of the leaves touched by the spray solution turn yellow, wither and drop, seriously affecting the plant's growth, but it will not
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Damage Caused by Cutworms to Reishi Mushrooms and Its Control Methods
Cutworms belong to the order Lepidoptera, family Noctuidae. They are not only an important pest of agricultural and forestry crops, but also a common pest in the cultivation of edible fungi such as reishi mushroom, silver ear fungus, wood ear fungus, and oyster mushroom. They are widely distributed, but the degree of damage varies. They occur more frequently in outdoor open-field sunken-bed cultivation and plastic greenhouses. Damage characteristics: The larvae feed on the mycelium of reishi mushrooms, inhibiting mycelial growth and affecting fruiting body formation, which reduces reishi mushroom yield and lowers quality. Morphological characteristics: Adult body length 16-23 mm, wingspan 42-54 mm
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Damage Symptoms and Control Methods of the Ganoderma moth
The Ganoderma moth, scientific name Hapsifera barbata Christoph, belongs to the order Lepidoptera, family Tineidae. Also known as the wood-boring worm, its larvae bore into and feed on polypore fungi. In recent years in the Jiangsu area, it has been found causing damage on the culture media and fruiting bodies of log-cultivated Ganoderma, Armillaria mushroom logs, substitute-substrate Ganoderma and oyster mushrooms. Damage characteristics: on soil-cased Ganoderma, the moth bores into the fruiting body, feeds on the contents, and excretes frass onto the surface of the fruiting body; in severe outbreaks, it can eat the fruiting body completely bare. Morphological characteristics: adult body length 5-
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Occurrence and Damage Characteristics of Tea Tussock Moth and Integrated Control Methods
In recent years, with the development of pollution-free tea and organic tea production, the frequency and amount of chemical pesticides used in tea gardens have decreased, and some tea gardens even do not use chemical pesticides, resulting in aggravated damage by the tea tussock moth in a short period. In the county where the author works, tea tussock moth damage has occurred for several consecutive years, and after being damaged, the tea plants were left with only bare branches, greatly affecting the economic income of tea farmers. 1. Damage symptoms: The tea tussock moth larvae bite and feed on leaves, causing leaf notches and bare branches. 1st-2nd instar larvae gather on the underside of leaves to feed on the mesophyll, leaving only the epidermis and veins, and the damaged leaves appear transparent
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