Factors Affecting Worm Flies (I)

First, the types of pests and their development stages We previously mentioned that different pests have different nutritional characteristics, that is, different pests have different growth environments, habits, and food sources. Therefore, different pests will affect one or more species. Interested in the kinds of items, it will cause these materials to be eroded. At the same time, different pests have different degrees of damage to the articles at different developmental stages. Some adult pests are harmful to the articles, while others are seriously harmful to the articles. Therefore, to prevent pests to understand the types of pests and living habits, in order to prescribe the right medicine.
Second, the chemical composition of goods In addition to some products related to worms, but also with the chemical composition of products and the environment temperature and humidity have a great relationship. The products that are likely to cause corrosion are wool fabrics, silk fabrics, artificial fiber products, natural grass fabrics, furs and their products, food, dried fruits, and so on.
1. Enamel wool fabrics of wool fabrics are woven from wool. The main component of wool is keratinous proteins (above 91%). Wool horny protein macromolecule contains a large number of acyl acids. Under the action of lye, the disulfide group in the acid chloride is destroyed and hydrolyzed. In a short time, the wool can be dissolved and the keratin protein molecule is very large. Without digestion, it cannot be absorbed and utilized by insects. Protein digestion is mainly achieved by the action of proteases. Keratin protein is a basic food material for many species of Lepidoptera, Tricholoma and several species of Coleoptera. The larvae of the larvae have a special interest in keratinous proteins, such as the grain moth, the negative bag moth, the black spot moth, and the two point moth, which can erode mammalian coats.
2. Silk silk fabrics are made of mulberry silk, tussah silk, and ramie silk. Silk is composed of silk fibroin and sericin. Sericin is easily dissolved in boiling water and lye; silk fibroin consists of various amino acids. The composition consists of glycine, amino propionic acid, and cheese amino acids. Silk fibroin is insoluble in water and has strong hygroscopicity. In a moist environment, fibroin can easily cause mildew and insects. Some worms and roundworms can etch silk and insects, and they can grow and develop depending on silk fibroin and sericin.
3, leather products of eroded leather is processed with the animal's dermis part. Its main component is the cortex, which is a protein that remains after the raw material is tanned. This protein can be used by the enzymatic hydrolysis of protein enzymes in certain insects. Leather also contains 3% to 4% of fat, and oil grass and tire grass contain more oil, which can be hydrolyzed by the corresponding lipase. Some leathers are coated with a coating agent composed of casein and other substances, and some also have a polishing agent made of animal blood. This layer is rich in protein and carbohydrate substances, that is, certain insects. Nutrients. The decay of leather and its products is very serious, and some have been etched into many light-colored scars, such as Pedicidae and Pedicelidae, Black Pelican, Pelargonium, Pediculus. These insects contain a variety of enzymes that hydrolyze and digest the above-mentioned chemical components.
4, the skin of the skin, many skins such as fur skin, mink skin, civet, AI skin, chinchillin skin, fox skin, raccoon skin, sheep skin, goat skin, raccoon skin, etc., rich in skin protein, keratin Proteins, sugars, and fats, which are due to the tanned fur, adding the right amount of fat can improve the softness, plasticity, strength and stability of the finished leather. Simultaneously adding fat can form a fat film protective layer around the skin fibers on the leather surface to prevent the fibers from sticking during the drying process. The added fats include synthetic fatliquors, synthetic mid-hoofed oils, sulphonated castor oils, and oxygenated fish oils, which provide a wealth of nourishment for warehouse pests.
5, viscose viscose viscose fiber viscose fiber is a regenerated cellulose fiber, almost all of the composition of cellulose. Early viscose fibers were filaments, commonly known as rayon, and later they gradually developed into staple fibers. All of them can be purely spun or blended with other fibers. The chemical composition of viscose fiber is similar to that of cotton fiber. Its properties are similar to that of cotton fiber. Its hygroscopicity is better than that of cotton fiber, and its strength is lower than that of cotton fiber. Because viscose fiber is composed of cellulose, under the action of cellulase, viscose fiber Can be hydrolyzed to glucose. Therefore, pests having cellulase and other pests such as ciliates, flagellates, and amoebas that can secrete cellulose can both digest and utilize fiber materials. Therefore, viscose fiber and its fabric will be infested. According to the physiological structure of the insect pests in the warehouse and the biochemical characteristics of various enzymes in the body, the commonly used hamsters are generally not well digested and utilized by acrylics, polyester, vinylon, and nylon, so such synthetic fabrics are generally not easily eroded.
6. The wood etched from wood is composed of cellulose (40% to 62% by dry weight), lignin (18% to 36% by dry weight), and hexoses and pentosans, which are collectively referred to as hemicelluloses. Fresh wood also contains starch. In addition, wood also contains small amounts of other substances such as tannins, pigments, oleoresins, fats, organic acids, organic nitrogen compounds, and the like. Of all the wood components, lignin is never digested. This is due to its special structure. As for cellulose and hemicellulose, only certain insects can digest.
In addition to the above-mentioned several commodities, foodstuffs such as grains, dried foods, meat items, and egg products contain a large amount of nutrients required by insects and are easily eroded by pests in the warehouse. Therefore, it is necessary to adopt appropriate defenses. Pests are packaged to protect them.
Third, the impact of temperature on pests Any kind of pests exist as an integral part of the living environment, it is closely related to environmental factors, mutual influence, changes in various ecological factors affect the pest community changes and population Increase or decrease.
Pests are hypothermic animals whose body temperature depends largely on the temperature of the surrounding environment. Therefore, temperature has a direct impact on the larval development speed, adult life and reproduction rate, as well as the death rate and migration distribution. Although pests also have the ability to regulate body temperature by changing the degree of respiration and the rate of water evaporation, this ability is extremely weak.
The regulation of insect body temperature mainly depends on obtaining and dissipating heat. There are two endogenous and external sources of heat gain. The heat obtained from decomposition of nutrients by the insect's own metabolism is endogenous heat, and the heat obtained from the environmental temperature of the pests' habitat is external heat. For pests, external heat is the main source, and endogenous heat regulates body temperature. effect. Dissipation of heat generally radiates outward through three ways: water evaporation, outward conduction, and heat radiation. The loss of heat by evaporation of water is the most important.
(To be continued)