A.T.M. Hassanuzzaman
Senior Scientific Officer
VPD, BARI, Gazipur
Md Yousuf Mian
Ex DG,BARI
IPM-CRSP,HRC.BARI
The experiment was conducted to study the effectiveness of Gilphide, an acute rodenticide, against Bandicota bengalensis (Gray). In both "No choice" and Choice" test out of ten male and ten female rats, eight males and nine females died within 24 hours. Five males and five females died in semi natural field test. The per cent mortality of the Bandicoot rat was 85% in cases of both no-choice and choice test. In semi-natural field test, the mortality was 83.33% but it was 82.47% in case of field test.
Efficacy, gilphide (zinc phosphide), rodenticide, Bandicota bengalensis
Sreepur and VPD, Gazipur
Pest Management
To evaluat the efficacy of Gilphide against Bandicota bengalensis (Gray).
Bandicoot rats were collected by trapping from poultry farms of Sreepur and were kept in 40 X 25 X 18 cm rearing cage in the laboratory. No-choice and Choice test of Gilphide bait contains 2% Zinc phosphide (80% a.i.) feeding tests were conducted in the laboratory using 20 acclimatized, adult rats (10 male and 10 female). In the "no choice" test, 24h starved rats were exposed individually to 10g Gilphide bait in a food cup for 24 hours. In case of "choice feeding" test, two food cups were provided to each animal, one cup containing 25g of Gilphide bait and the other containing 25g of plain wheat grains. The rodenticide was supplied for two days and the plain wheat grains was provided up to end of the experiment.
Simulated field test in outdoor rodent enclosure: One pair (mail and female) of healthy rats was released into each (8 X 6 m) of the six compartments of the outdoor rodent enclosure for simulated field experiment. Fifty grams of Gilphide rodenticide and 50g of rat food were placed in each compartment per day, distributed equally in two places. Daily observations were made to record the activity of the rats and their mortalities.
Field test: Field test was conducted in poultry farms at Sreepur Upazilla under Gazipur district. Three heavily infested poultry farms were selected. The selected farms were more or less similar in size (approximately 30 m X 20 m). All farms were “Kacha” i.e. wall and floor was made by mud. The pre and post-treatments rodent population index was taken by using tracking tiles. Tile index were taken for two nights. The activities of rat were determined on the basis of per cent active tiles.
VPD Annual report-2004-2005,BARI
Twenty thousands
"No-choice" and "Choice test": Out of 20 rats exposed to the "no-choice" feeding test, 8 males and 9 female rats died within 24 hours. The average bait consumption per rat per day was very small i.e. 0.39g only. The average mortality rate was 85% for both sexes. In the "Choice" feeding test, 8 male rats and 9 female rats died within 24 hours. The average mortality was 85% for the both male and female rats .
Simulated field test in outdoor rodent enclosure: Two male rats and one female rat stopped their activity after first day of bait application . On the second day, four rats (2 male and 2 female) were found dead in comportment 2, 3, 5 and 6. Among them three were found outside the burrow and one was inside the burrow. The activity of two rats (1 male and 1 female) continued up to third day and found dead on the 4th day of bait application . One male and one female rat continued their activity up to the 10th day in compartment 1 and 5. They were finally captured by the live trap at the end of the experiment. In this experiment, the mortality rate of the bandicoot rats was 83.33 % and the average day to death was 2.2.
Field test: Gilphide showed a considerable reduction (82.47 %) in rodent number in all poultry farms. Gilphide is an effective rodenticide and can be used for controlling field rodents in Bangladesh.
Report/Proceedings