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33
Baiting of Sewers.
In connection with the Block Control schemes, rodent repression work was also
carried out in the Council's sewers, and the Borough Engineer and Surveyor has kindly
supplied me with the undermentioned information of the treatment carried out during
the year. The normal procedure is for two treatments to be carried out; treatment No. 1
being the use of sausage rusk plus 2½% line phosphide, followed after a month's interval
by treatment No. 2 with bread mash plus 10% arsenious oxide. It will be seen that the
double treatment carries over at the beginning: of the vear.
DETAILS.
DATE OF TREATMENT.
17th to 26th
January, 1949.
Treatmen
No. 2
Treatment
No. 1
27th June to
6th July, 1949.
8th to 15th
August, 1949.
T reatment
No. 2
1. Total number of manholes in foul
and connected systems 316 305 306
2. Bait base and poison used Bread mash Sausage rusk Bread mash
and arsenious and zinc and arsenious
oxide phosphide oxide
3. No. of manholes baited 267 294 295
4. No. of manholes showing prebait
takes 225 272 264
5. No. of manholes showing complete
prebait take (on one or both days) 148 202 165
6. Schemes of baiting used Two pre baits — one pois on bait
7. No. of bodies found 53 222 181