In Bangladesh, rats cause severe damage to crops every year.

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Although small in size, the harmful side of the rat is huge. Every year in our country, special campaigns are carried out at the government and private levels for the extermination of this animal, which we call the rat extermination campaign. Only those who are directly or indirectly harmed by this superhuman creature realize the importance of killing the animal. The field of their loss is very wide.
Rats have a pair of very sharp teeth in front of them, which continue to grow from birth to death. And to keep this evergreen tooth in its normal state, rats always bite. As a result, rats waste four to five times more food than they eat. That's why the loss of rats is so terrible.
It is not just rats that damage crops. Cut and destroy books, clothes, furniture, bedding etc. They damage field cereals, vegetables, root and fruit crops. Again, the crops stored in the warehouse are also severely damaged. They are carriers and spreaders of about 60 types of pathogens in humans and animals, including plague, jaundice, typhoid, skin diseases, dysentery, fever, and worms. They also destroy flood control dams and irrigation canals, often cutting off electrical appliances and starting fires. Therefore, it is very important to control rats.
Harmful species of rats: About 13 species of harmful rats have been identified in Bangladesh. Three species of rats have been found on the Dashmina seed breeding farm. The species are-

• Big black rat in the field (Bandicotabengalensis)
• Black rat in the field (Bandicotaindica)
• Rattusrattus
  Black rats are a major pest in Bangladesh, including in agricultural crops, warehouses, rural and urban areas. Although there are more of them on St. Martin's Island, house rats and tree rats are present all over Bangladesh.
  Behavior or temperament of rats: They always have to fight to keep the size of the two pairs of continuous growth teeth normal.
• Can adapt and reproduce in any environment;
• Some species are adept at climbing and swimming;
• Rats have strong sense of smell;
• They can understand the taste of food;
• They cannot diagnose color;
• Rats usually move at night and hide during the day;
• Expresses reluctance towards new things. For example, shyness towards traps or poison traps.
  When the lowlands are flooded during the monsoon season and the rain water collects in the crop lands, the rats take shelter in relatively high places. In most cases, rats take refuge in high rural roads, embankments and old structures. These infrastructures are used to build rat nests. When it rains, rats, like tidal water, become a curse for embankments. When the tide and water submerged the crop fields, the rats came and took shelter in the irrigation canals, embankments and rural roads. When water flows through the irrigation canal, cracks appear in the irrigation canal due to excessive leakage. Irrigation canals, embankments and roads are severely damaged due to water entering through those leaks / cracks. Again damages the control box of the irrigation device.
  The only part of the water that is used effectively. The rest of the water is lost to crops in irrigated fields. That is, water from any source (river, well) does not reach the root zone of the plant. Part of the water is lost during transportation through canals and into fields. The rest is stored in the rootzone and eventually used by plants.
  The reason for wastage of field water is in canals / dams
  Rows of rat holes are one of them.
  Remedy:
  Rat or other animal holes or sitting or broken irrigation bamboo poles should be marked by keeping the shape of the irrigation canal unchanged. Fill holes, seating and broken areas with clay soil, beat them well and clean the sediment, repair broken irrigation canals.
  Again through underground irrigation or barred pipelines we can avoid irrigation damage by rats or any other animal.
  Rats can usually be controlled in two ways.
• Chemical control of rats
• Suppression of rats in an environmentally friendly manner
• Chemical method: The control of rats using different types of poisons is called chemical control of rats. Two types of poisons are commonly found. Acute or immediate poisoning and long lasting poisoning.

1. Acute poisoning: To prepare zinc phosphide poisoning, mix 40 percent flour with 1 part poison and 3 percent molasses and the same amount of oil and make small pills and keep them in place. Before using the bait, the bait should be left at intervals of 3 to 4 days without poison before evening. Rats die with zinc phosphide food. After eating this empty bisatop for a few days, bisatop should be applied to those places. If there is some difficulty in using acute poison bait, then the poison bait made by zinc phosphide rats can be sick by eating a little bit of it before eating in moderation but it does not die.
2. Long lasting poison: Long lasting poison is Recumin, Broadifecon. The rat's ability to coagulate gradually disappears after eating rat poison made with long-lasting venom,