Conditions for the production of various pests and diseases of wheat
The degree of occurrence of wheat stem bees is mainly related to factors such as climatic factors, farming system, and insect resistance. The larvae of the larvae occur in 1 year in one year, and the mature larvae are thinned and overwintered in the base of the stem or in the roots. In April of the next year, it became phlegm, emerged in mid-May, and reached the peak of emergence in late May. The emergence period lasted for more than 20 days. After emergence, the female bees lay eggs in the thin straw of the stem wall, and the number of eggs laid was 50-60. Up to 72 capsules, the spawning site is mostly near the young stem section of the 1-3 section of the wheat ear. When spawning, the egg stem is sawed by a spar to make a small hole, and the egg is scattered on the inner wall of the stem. During the egg period of 6-7 days, the larvae feed on the inside of the stem wall after hatching, and enter the gluttony period after the third age. They often bite through the stem or the whole stalk is eaten empty, and gradually feed down to the base of the stem, and the wheat becomes white. After the larva is matured, it will be transparent and thin in the roots. There is a certain difference in insect resistance between wheat varieties. At present, a new spring wheat variety of plateau 205 anti-wheat bee has been screened. The occurrence condition of wheat bran is 1 generation every 3 years or so. Adults and nymphs over 8 years old survive winter. In late April and early May, the wintering adults began to move, and in June, they began to lay eggs. In June and mid-June, they hatched into nymphs. From October to November, the nymphs of 8-9 years old wintered. In the next year, the winter nymphs began to be active in the middle and middle of the next year, and the winter nymphs overwinter in the autumn. In the spring of the third year, the older nymphs began to be active after wintering. In August and mid-year, the nymphs were mature and became adult. After supplementing the nutrients, adults enter the wintering period. The adult crouched in the soil and asked for activity at night. There is phototaxis, from April to November for the activities of the cockroaches, the most serious damage in spring and autumn. In addition, è¼è›„ like to inhabit the river bank, the canal, the vegetable garden and the mild saline-alkali wetland, there is the saying that "running wet does not run dry". Oriental cockroaches are more wet than North China. The condition of annual occurrence of wheat bran varies with species and species. This is a type of insect with a long history of life, usually one generation a year, or two to three years and one generation, the elderly 5 to 6 years and one generation.蛴螬 A total of 3 years old. 1, 2 years of age is shorter, the third age is the longest. In the endogenous habitat, its activities are mainly related to the physical and chemical properties of the soil and the temperature and humidity. The optimum soil temperature during the year is 13-18 °C, which is higher than 23 °C, which gradually shifts to the deep soil layer. When the soil temperature drops to the appropriate range of activity in autumn, it moves to the upper soil layer. Therefore, the damage to the nursery, seedlings and other crops in the orchard is mainly the heaviest in spring and autumn. The differences in generational duration are prominent in the biological characteristics of the golden worm. In the underground, it mainly damages the roots and stems of wheat seedlings. There are three kinds of golden worms, golden-spotted golden worm and brown-spotted golden worm, and their larvae are collectively called golden worms. When it is harmful, it can bite off the newly unearthed seedlings, or it can be taken from the roots of the grown seedlings. The victim is not completely bitten, and the fracture is not complete. It can also drill larger seeds and tubers and roots, and smash into holes, and the infected plants die and die. The golden worms of the gully are phlegm in August-September, and the pupa period is about 20 days. In September, they are feathered into adults, that is, wintering in the soil, and activities are unearthed in the following three to three months. The activity of the golden worm is closely related to soil temperature, humidity, and the growth period of the host plant. When the wheat is greening to the rainy day at the jointing stage, the golden-spotted golden worm and the golden-spotted golden worm are heavier and enter the stagnation period.
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