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The Extent of Salvinia Infestation in Kerala (S. India): Its Impact and Suggested Methods of Control

Published online by Cambridge University Press:  24 August 2009

K. J. Thomas
K. J. Thomas
Affiliation:
Investigator-in-Charge, Scheme of Research on Ecology of Aquatic Weeds of Kerala; Department of Botany, Mar Ivanios College, Trivandrum 695015, India.
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Extract

The aquatic weed Salvinia molesta (syn. S. auriculata) has spread to many parts of the tropics and subtropics. In Kerala, it has become established as a dreadful weed occupying large areas of open water, causing navigational problems, interfering with irrigation and fishing, rendering the water unfit for human consumption, and facilitating mosquito breeding, etc. The H2S generated in the decaying weed-mass in the water is destructive of generative equipment in hydroelectric installations, blocks intake apertures of ships, and damages engines of small motor-boats. In addition, the weeds cause reduction in the stored water of reservoirs, owing to excessive evapotranspiration, while thick mats of Salvinia, which later form large floating islands supporting secondary and tertiary colonizers, may be instrumental in the gradual drying up of natural and man-made water-bodies. These are very serious matters which have to be tackled effectively.

Type
Main Papers
Information
Environmental Conservation , Volume 6 , Issue 1 , Spring 1979 , pp. 63 - 69
Copyright
Copyright © Foundation for Environmental Conservation 1979

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References

REFERENCES

Bennet, F. D. (1966). Investigations on the insects attacking ferns, Salvinia spp., in Trinidad and Northern S. America. Proc. 5th Weed Control Conf., 19, pp. 497–504.Google Scholar
Cook, C. D. K. & Gut, B. (1971). Report on the Salvinia (African Pyle) Problem in Kerala. Botanischer Garten der Universität Zürich, Zürich, Switzerland [not available for checking].Google Scholar
Gaudet, J. J. (1974). Report to the Kerala State Electricity Board on the Present Status of Salvinia in the Kakki Reservoir. (Unpublished communication to the Author.)Google Scholar
George, K. (1973). Ecology and chemical control of some important aquatic weeds of Kerala—Salvinia, Ludwigia, and Cyperus. Reg. Semin. on Nox. Aqu. Veg. Trop, and Sub-Trop., New Delhi (Abstracts), p. 35.Google Scholar
Loyal, D. S. & Grewal, R. K. (1966). Cytological study on sterility in Salvinia auriculata Aubl. Cytologia, 31, pp. 330–8.CrossRefGoogle Scholar
Menon, M. V. K. (1971). The threatening weeds. Sci. Today, 6, pp. 33–8.Google Scholar
Nair, A. K. & Pai, T. R. (1973). Kakki Reservoir—Environmental effect of water-weeds and their control. Hydro-Power, Kerala State Electricity Board, Trivandrum, pp. 13–16.Google Scholar
Samuel, S., Kurien, C. V., Mathew, K. & Antony, R. A. (1975). A preliminary study of Salvinia auriculata and its influence on the habitat. Third All India Symp. on Estuarine Biol. Dept Mar. Sei., University of Cochin (Abstracts), pp. 12–13.Google Scholar
Sankaran, T. (1973). Possibilities of biological control of the aquatic weeds Eichhornia crassipes and Salvinia auriculata in India, Reg. Semin. on Nox. Aqu. Veg. Trop, and Sub-Trop., New Delhi (Abstracts), pp. 50–1.Google Scholar
Thomas, K. J. (1962). A survey on the vegetation of Veli (Trivandrum) with special reference to ecological factors. J. Ind. Bot. Soc, XLV(1), pp. 104–31.Google Scholar
Thomas, K. J. (1973). Studies on the aquatic vegetation of Trivandrum (Kerala). Reg. Semin. on Nox. Aqu. Veg. Trop. and Sub-Trop., New Delhi (Abstracts) pp. 12–3.Google Scholar
Thomas, K. J. (1975). Biological control of Salvinia, by the snail Pila globosa Sw. Biol. J. Linn. Soc. Lond., 7(4), pp. 243–7.CrossRefGoogle Scholar
Thomas, K. J. (1977). Impact of aquatic weeds on the changing patterns of ecosystems. Proc. All India Symp. on Environ. Biol., Univ. Kerala, Trivandrum, and UGC (Abstracts); p. 171.Google Scholar
Thomas, P. A. (1968). Biological Control of Salvinia auriculata by Paulinia acuminata De Geer (Orthoptera: Acrididae). Paper presented to the IHD Meeting of experts on Ecology and Control of Aquatic Vegetation, UNESCO, Paris, 16–18 December 1968. [Not available for checking].Google Scholar
Unni, S. K. (1973). The problem of aquatic weeds in Kerala. Reg. Semin. on Nox. Aqu. Veg. Trop, and Sub-Trop., New Delhi (Abstracts), p. 14.Google Scholar
Velu, M. (1973). Development of mechanical equipment for eradication of aquatic weeds. Reg. Semin. on Nox. Aqu. Veg. Trop, and Sub-Trop., New Delhi (Abstracts), p. 46.Google Scholar
Williams, R. H. (1956). Salvinia auriculata Aubl.: The chemical eradication of a serious aquatic weed in Ceylon. Trop. Agric. Trinidad, 33, pp. 145–57 [not available for checking].Google Scholar