A magnetic door stop is a set of two pieces of hardware. One piece attaches to the bottom inside corner of a door, while the other piece is fixed to the adjacent wall. When these two pieces come in contact, the magnetic door stop may then be able to hold a door open and protect the wall from damage at the same time. Door stops are often available in a variety of finishes, styles and price ranges to suit an individual`s specific needs.
Once both pieces of hardware have been successfully installed, the two pieces should [catch" when the door is open. This is because the two magnets have opposite, attractive forces strong enough to hold a door open. A magnetic door stop is, however, usually weak enough that a simple tug on the door should separate the magnets, which allows the door to close when necessary.
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First, underground pests
There are mainly cockroaches, cockroaches, golden worms and tigers. These pests crouched out at night, biting the base or root of the stem of the corn seedlings, causing dead seedlings, lack of seedlings, and broken ridges. There are two measures to prevent and control such pests: First, pay attention to clear the weeds on the edge of the field and the ground to eliminate eggs and larvae, and control them from the source. The second is to use pesticides to control. It is best to use seed dressing at the time of sowing, that is, use 50% of phoxim 1 kg of water to mix 25-30 kg of 500 kg of seed dressing; or use 40% of methyl isothiophos to 20 kg of water to mix 500 kg. Without seed dressing, 50% phoxim can be used after sowing, 0.2-0.25 kg per mu, 400-500 kg of water, and roots. When there is any hazard in the field, it can be diluted with 90% trichlorfon or 50% phoxim 0.50 kg and mixed with 40 kg of wheat bran or crushed oil cake to make poison bait. It is sprinkled in the vicinity of corn seedlings in the evening.
Second, corn glutinous rice
Corn borer, also known as borer, is a pest that has been more harmful and more common in corn in recent years. The early-age larvae penetrated into the heart leaf and left many small horizontal holes after the leaves were unfolded. Older biting filaments, stems, and tassel bases can also be drilled into the cob into and out of the food. A combination of agricultural control and chemical control can be selected for prevention and treatment. Agricultural control measures mainly include the use of burning, simmering, rolling, sealing, stripping, shovel treatment of straw, root mites, elimination of wintering hosts, reduction of insect population base and selection of resistant varieties. Chemical control should be carried out in the two stages of heart and leaf stage. The heart-leaf worm is sensitive to drugs, and the control effect and timing are better. It can be used for heart and leaf control with 3% carbofuran granules or 1% 1605 emulsion granules (50% ethyl 1605 emulsifiable concentrate, 0.5 kg of water plus 10 kg of diluted water and 25 kg of cinder or fine sand). Left and right, about 2 kg per acre; or with methamidophos and permethrin mixed in a ratio of 5 to 9:1 diluted 1000 times solution into the heart, the effect is better. At the earing stage, the corn is being squirted, and the older larvae are active on the plants to bite the filaments and stems. 90% of trichlorfon 800 times liquid sprayed silk and ears can be used, or after the pollination is finished, the trilobite is coated with the medicinal mud to control the filament parts.
Third, the locust
Aphids harm corn heart lobes, tassels, filaments and eucalyptus leaves, which not only absorb the organic nutrients of corn, affect photosynthesis, but also spread diseases, especially in dry days. In addition to field management measures such as enhanced irrigation to enhance the plant's own resistance, if the hazard is found, it can be controlled by spraying 40% omethoate emulsion 1000 times or 80% dichlorvos 1600 times. It can also be used as a high-concentration liquid in the big bell period with 40% omethoate emulsion and 80% dichlorvos each 0.5 kg water to 50 kg, and then cut into 7~8 cm long straw into the liquid. After soaking for 1 hour, the toxic straw was prepared, and after taking out, three roots were inserted into each corn leaf to control. Although this method is more labor-intensive, the control effect is better, and the control effect can reach over 97%. Since the mites generally start from the tassel, cutting the tassels in time after pollination can also have a good control effect. 
The main pests in corn fields include underground pests, corn borers and aphids. In recent years, due to the abnormality of the climate, conditions have been created for the occurrence of different pests, and the damage caused to corn production has also increased year by year. Farmers’ friends have neglected the prevention and control of these pests for various reasons, causing unnecessary losses. Here, the author summarizes the following prevention methods for the living habits of different pests, combined with our practical experience for the reference of farmers.
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