Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Lewisham Borough]
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29
Rodent control — treatment of rivers and ditches
In addition to the measures taken to deal with the destruction of
rats in private and business premises, special efforts are made to cope
with this problem as it affects the rivers and certain of the ditches in
the borough.
Treatment is carried out mainly between October and April by four
men, and in addition to the actual destruction of rats it includes the
clearance of such objects as water cisterns from river beds and the
lopping of undergrowth along the banks, in order to remove likely
sources of harbourage for rats.
The normal practice followed in treating rivers and ditches is to
lay prebait on three or four consecutive days followed by poison bait
on the fourth or fifth day. The poison bait used is zinc phosphide
mixed with sausage rusk and water.
During 1952, treatments were carried out on all sections of the
rivers in the borough together with certain ditches. Where heavy
infestations were found, retreatments followed. The undermentioned
table gives a summary of work carried out during the year:—
Table 16
River | No. of base points | Prebaitin g | Poison bait | Estimated rats killed | ||||
---|---|---|---|---|---|---|---|---|
No. of days on which prebait laid | Results | Amount laid (lbs.) | Amount taken (lbs.) | |||||
Takes | Partial takes | No takes | ||||||
Pool | 121 | 12 | 92 | 23 | 20 | 10 | 350 | |
Quaggy | 207 | 32 | 128 | 76 | 26 | 19 | 714 | |
Ravensbourne | 483 | 79 | 331 | 150 | 70 | 43 | 1517 | |
Ditches. Ladywell Road to Chudleigh Road | 42 | 7 | 16 | 26 | 3 | 2 | 63 | |
Reigate Road to Verdant Lane | 35 | 3 | 25 | 10 | 2 | 2 | 81 |