Field Rats Are Controlled by Which Chemical
WouterThere are several methods to control field rats, including trapping, mechanical means, and chemical products. Chemical products involve using baits that kill the rats. The baits must be used according to label instructions and be placed in tamper-proof rodent bait stations to prevent accidental exposure. Some methods may also involve fumigation of vehicles to remove ground burrows.
Chemical treatments are most effective when implemented throughout a farming community. In rice fields, CTBS should be used. Bunds should be planted with a low density, not more than 30 cm, and rat burrows should be destroyed while the rice is still in the tillering stage. Rat trapping should be completed within two weeks of planting to ensure effective control.
One type of chemical is called an anticoagulant. This chemical acts by preventing the rat’s ability to produce certain blood clotting factors. Anticoagulants block vitamin K, and therefore inhibit the production of coagulation factors II and VII. This chemical is effective at killing rats in multiple doses, but it is a relatively slow agent.
The active ingredients of this chemical are listed in Table 2. They fall into two categories: the older ones require multiple doses over several days while the newer ones are lethal after a single feeding. The dosage for bait application varies depending on the anticoagulant you use. In general, the application of these chemicals should be continuous for 10 to 15 days, or until the rats stop feeding.
