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Identification Features and Control Methods of the Privet Looper
Scientific name: Naxa seriaria Motschulsky. Morphological features: The adult has a wingspan of about 40 mm, with a slender body that is yellow-white. The forewings and hindwings are thin, white, and slightly transparent, with two rows of black star-shaped spots along the outer margin, and each wing has a relatively large black spot in the middle. The forewing also has a row of dark brown spots near the basal angle. Newly laid eggs are white, gradually turning orange-red, glossy, and arranged in bead-like strings. The larva is about 30 mm long, dark brown, with indistinct black patterns and spots on its body. Except for the thoracic legs and the prolegs on the eighth and ninth abdominal segments, the prolegs on the other segments are all reduced, and each segment is covered with gray-white hairs. The pupa is yellow-brown with dark brown spots and patterns. Damage situation: This insect mainly damages privet (Ligustrum), water wax (Ligustrum obtusifolium), and osmanthus (Osmanthus fragrans). It is a voracious leaf-eating pest that often gathers in groups and nibbles away the leaves. Especially when the population density is high, it can completely devour the leaves of an entire plant or a whole patch of water wax and privet in a short period, seriously affecting growth and ornamental value. Occurrence pattern: This insect has two generations per year and overwinters as middle-instar larvae on the tree canopy. Pupation begins in mid-May, and adults emerge at the end of May and in early June. Adults mate on silk webs and lay eggs in strings. After the eggs hatch, the larvae spin silk webs on the tree canopy and nibble the leaves until they are eaten up, then spread to neighboring canopies. The second-generation adults appear around August, and the adults are phototactic. Control methods: 1. During the peak emergence period of adults, use lights to trap and kill the adults. 2. The pupae and eggs are all attached to the insect silk webs near the tree canopy, so they can be searched for and removed. 3. In the early stage of larval hatching, spray 1-2 times with insecticides such as dichlorvos, trichlorfon, and omethoate at a 1000-fold dilution. This insect has strong resistance to pesticides, so spraying should be thorough and should be done early; otherwise, the efficacy will be affected.
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Symptom Identification and Control Methods of Peach Gummosis
Peach gummosis is a disease commonly occurring on peach trees today, and it can be severe; especially in peach orchards with extensive management and weakened tree vigor, the incidence rate of affected trees can reach over 90%. This disease severely weakens tree vigor, affects yield and quality, and in severe cases leads to dead branches and dead trees, threatening the production and development of peach trees. It is also one of the most troublesome diseases for fruit growers. I. Causes of the disease. There are two causes of peach gummosis: one is non-infectious pathogens, such as mechanical injury, damage from pests and diseases, frost injury, freezing injury and other wounds
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Identification and Control Methods of the Greenbug
Scientific name Schizaphis graminum (Rondani), order Homoptera, family Aphididae. Distributed throughout the country. Hosts include wheat, barley, oats, sorghum, rice, foxtail grass, sedge and other grasses. Damage characteristics: The greenbug often feeds on sap on both the front and back of wheat leaves or inside and outside the basal leaf sheaths, causing wheat seedlings to turn yellow and wither or to lie flat and be unable to joint, and severely affected wheat plants cannot head normally, directly affecting yield; in addition, it can also transmit wheat yellow dwarf virus. Morphology
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Identification and Control Methods for the Russian Wheat Aphid
Scientific name Diuraphis noxia (Mordvilko), order Homoptera, family Aphididae. Synonym Brachycolus noxius. Also known as the Russian wheat aphid. Distribution in **. In addition, the Liaohe, Yellow River, Huaihe and Haihe river basins are all suitable areas for this insect. Abroad it is mainly distributed in Ukraine, Central Asia, North Africa, Eastern Europe, Nepal, South Africa, Mexico, the United States and Canada. It is a worldwide major pest of wheat. It is a domestic quarantine target. Hosts: wheat, barley, rye, oats, wild oats, brome
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A Detailed Guide to the Identification and Control Techniques of the Black Velvet Chafer
The black velvet chafer is commonly known as the "blind bumper" or "big velvet mandarin jacket." It mainly damages soybean seedlings in its adult form (the chafer), biting the growing points or severing young stems. When outbreaks are severe, it can eat the seedlings bare, causing missing plants and broken rows, or even ruining the field. This insect has one generation per year, overwintering as adults in the soil, and occurs more often in fields following soybeans. From late April to early May, it first feeds on weeds; after soybean seedlings emerge, it bites the soybean seedlings. At night this insect hides in the soil and comes out during the day to cause damage. It feeds most heavily from 3-5 pm, and the number of insects is greatest on windless, warm days. Control methods: 2.5
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Detailed Explanation of Symptom Identification and Prevention and Treatment Methods for Fish Liver and Gallbladder Lesions
Fish viral diseases, bacterial diseases, nutritional metabolic diseases, water pollution, and long-term high-dose use of the same antibacterial drug can all cause lesions in the fish liver and gallbladder. In particular, second-year grass carp (Ctenopharyngodon idella) have a relatively high chance of contracting this disease, which often causes huge economic losses to aquaculture farmers. 1. Symptoms After fish contract liver and gallbladder disease, their external appearance is usually normal, and the main problems occur in the internal organs. The main symptoms are as follows: 1. Color changes. The liver appears white, pink, earthy yellow, yellow-brown, purple-black, or with red and yellow intercrossing, and may even turn green.
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Identification and Control Methods of the Spruce Sawyer Beetle
The spruce sawyer beetle (Monochamus urussovi Fisher), also known as the spruce black longhorn beetle, belongs to the order Coleoptera, family Cerambycidae. In China it is distributed in the Northeast, Inner Mongolia, Hebei, Shandong, Jiangsu, Shaanxi and other places. It mainly damages Picea koraiensis (Korean spruce), Picea jezoensis (Jezo spruce), Abies nephrolepis (Khingan fir) and others, and is a major pest of coniferous timber in northern China. Damage characteristics: the larvae damage felled trees, weakened standing trees, wind-thrown trees and logs in timber yards, forming thick galleries; the adults gnaw the tender bark of small branches of living trees. Morphological characteristics: adult body length 21-33
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Identification and Control Methods for the Great Spruce Bark Beetle
The great spruce bark beetle [Dendroctonus micans (Kugelann)] belongs to the order Coleoptera, family Scolytidae. It is mainly distributed in Austria, Belgium, Czech Republic, Slovakia, Denmark, Finland, France and other countries. In China, it has been found in the Makehe forest area of Qinghai Province. It mainly damages some species of Picea (spruce), and occasionally some species of Pinus (pine) and Abies (fir), as well as European larch and Douglas fir. Damage characteristics: adults and larvae attack weakened trees and dead standing trees; during outbreaks, they can attack healthy trees, severely disrupting the trees' transport function,
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Symptom Identification and Control Methods of Spruce Rust Disease
Spruce rust disease is distributed only in the **Tianshan region. The disease has a high incidence rate, but few diseased cones. Infected cones stop growing and quickly die. Symptoms: The disease affects the scales of both female and male cones. Infected female cones are slender and small, curved, with open scales; the bracts become lanceolate, and the cones turn yellow and stop growing. The scales are small, yellow, and bear orange-red protruding telial pustules. Pathogen: The pathogen is Chrysomyxa deformans (Diet.) Jacz.
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Identification and Control Methods of the Spruce Root Bark Beetle
The spruce root bark beetle (Hylastes cunicularius Erichson) belongs to the order Coleoptera, family Scolytidae. In China it is distributed in ** and Sichuan, mainly damaging spruce, and is especially severe on artificially regenerated seedlings. Damage characteristics: it feeds on the roots of spruce seedlings and attacks freshly cut stumps. Morphological characteristics: adult body length about 4.5mm, dark brown, slightly glossy, with sparse bristles. The frons is narrow and long, covered with flat, shallow, dense punctures each bearing 1 hair; the lower half of the frons is low and flat, the upper half protrudes
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