Effective anticoagulant rodenticide
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Anticoagulants impair the blood clotting mechanism, resulting in haemorrhage and death.
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CHEMICAL CONTROL using rodenticides is one of the important methods of rodent management.
Anticoagulants are an important group of rodenticides. They impair the blood clotting mechanism which results in haemorrhage and death.
However, the large scale use of anticoagulants like warfarin has led to the development of resistance. Hence the need for new anticoagulants resulted in the development of a second generation anticoagulant named bromadiolone, a hydroxycoumarin compound.
It is a single dose anticoagulant, which can be used anywhere as pre-baiting is not required.
Bomadiolone is available as a concentrate and is used at 0.005 per cent concentration in baits.
Bait preparation
To prepare 100g of poison bait 0.25 per cent bromadiolone concentrate, 93 g of broken rice, 3 g of sugar, 2 g of groundnut oil and 2 g of bromadiolone are mixed well. This is divided into 25 g of lots and kept in flat containers in places where rodents frequent. The bait is placed in the evening. The rodents, which consume the bait, die in three or four days. Dead rats should be collected and buried.
Preparing poison cake
The poison bait can also be used as cakes. Prepared cakes (Roban, Ratol) containing 0.005 per cent of bromadiolone are available. The cake can also be prepared with ease using the concentrate.
For preparation of a 100 g cake, the ingredients required are broken wheat (65 g), jaggery (3 g), bromadiolone 0.25 per cent (2 g) and paraffin wax (30 g). Broken wheat, jaggery and bromadiolone are mixed well in a vessel. Molten wax is poured into this and mixed well.
This mixture is then transferred to a metallic tray of 2.5 cm height and spread evenly. It is allowed to cool for 15 minutes and then cut into blocks of 5 cm x 2.5 cm size. The blocks can be taken out for use on the next day.
The anticoagulant cake can be placed in live burrows, coconut palms or roofs of houses where rodent damage is observed.
C. Nandakumar
& K. R. Sheela
College of Agriculture,
Vellayani, Kerala
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