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Korean J Parasitol > Volume 10(2):1972 > Article

Original Article
Korean J Parasitol. 1972 Aug;10(2):95-99. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1972.10.2.95
Copyright © 1972 by The Korean Society for Parasitology
Effectiveness of boric acid as a stomach poison for the German cockroach (Blattella germanica L.) Control
M. S. Zong,S. J. Kim,S. H. Koo and R. I. Han
School of Public Health, Seoul National University, Korea.
Seoul Health Junior College, Korea.
Abstract

The author carried out a study on the effectiveness of the boric acid as a stomach poison for German cockroach control from July to September 1971.

The test was performed by the feeding method under conditions of 20℃ and 80% relative humidity.

The baits were composed of one control group and five different combination groups with boric acid and sugar as follows.

1) 10 g sugar only(control group), 2) 1 g powedered boric acid to 9 g sugar(1:9 poison baits), 3) 2 g powdered boric acid to 8 g sugar(2:8 poison baits), 4) 4 g powdered boric acid to 6 g sugar(4:6 poison baits), 5) 5 g powdered boric acid to 5g sugar(5:5 poison baits), 6) 10 g powdered boric acid only (10:0 poison baits).

The insects were composed of 360 female adult German cockroaches collected by traps at the kitchens of restaurants and house holds in Seoul City.

The results were as follows:

1. The total mortality by poison baits in 72 hours after treatment were:

1) 44.3% by 1:9 poison baits, 2) 79.4% by 2: poison baits, 3) 96.7% by 4:6 poison baits(the most effective poison baits), 84) 8.3% by 5:5 poison baits, 5) 91.1% by 10:0 poison baits.

2. The peak mortality by the treatment hours were:

1) Up to 21 hours: 23.3% by 5:5 poison baits, 20.0% by 10:10 poison baits, 2) From 24 to 48 hours: 71.1 per cent by 4:6 poison baits, 55.6% by 10:0 poison baits, 3) From 48 to 72 hours: 21.9 per cent by 2:8 poison baits, 19.6 per cent by 1:9 poison baits.

The most effective treatment hours was from 24 to 48 hours.

Figures


Fig. 1
Total mortality of German cockroaches in 72 hours after treatment


Fig. 2
The mortality of German cockroaches by the poison baits

Tables


Table 1
Number of killed German cockroaches by the poison baits with boric acid


Table 2
Average percent mortality of German cockroaches by the poison baits with boric acid

References
1. Bare OS. J Econ Entomol 1945;38(3):407.
2. Cha CH, Ham KS, Lee YI, Koo SH, Han RI. [Susceptibility Of Cockroaches (Blattella Germanica Linneaus) To Various Insecticides]. Korean J Parasitol 1970;8(2):67–70.
 
3. Suzuki T, et al. Jpn J Sanit Zool 1959;10(1):75–78.
4. Walter EV. J Econ Entomol 1918;11(5):424–429.
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