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Relative efficacy of some botanicals, detergent and kerosene in controlling the pea aphid Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae) on grass pea Lathyrus sativus

Published online by Cambridge University Press:  28 February 2007

Melaku Wale
Melaku Wale*
Affiliation:
Adet Research Center, PO Box 8, Bahir Dar, Ethiopia
*
*Email: [email protected]
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Abstract

Grass pea Lathyrus sativus L. plays a major role in the nutrition of many poor people in Ethiopia. However, the crop suffers heavy damage by pea aphids Acyrthosiphon pisum (Hemiptera: Aphididae). To test potentially more sustainable and harmless alternatives to the commonly used insecticides, some botanicals (neem, garlic and hot pepper), soap, kerosene and the aphicide pirimicarb, were tested for their efficacy against A. pisum at Wondata village, close to the town of Bahir Dar, in northwestern Ethiopia, from 1999 to 2002. After pirimicarb, hot pepper was consistently the most effective botanical in controlling the pea aphid in terms of both pea aphid population as well as grain yield. Compared to the untreated control, there was up to 83 and 55% lower aphid population on pirimicarb- and hot pepper-treated plots in the 2000/2001 cropping season, respectively. There was also up to 93 and 54% higher grain yield on plots treated with pirimicarb and hot pepper extract, respectively. Soap was less effective, while kerosene caused phytotoxicity. Infestation levels increased with advancing maturity of the crop, rising exceptionally suddenly and dramatically near crop maturity. Combined ANOVA over years and crop growth stages indicated that aphid populations varied with years and growth stages. In 2001/2002, aphid populations were higher and grain yields were lower compared with the other years. Percentage parasitism of aphids was significantly higher on pirimicarb-treated plots (∼40%) than other treatments (<20%). Parasitism was essentially a late-season occurrence. Predator population, especially of ladybird beetles (Adonia spp.), was especially higher on hot pepper- and garlic-treated plots, and lowest on pirimicarb treated plots. Grain yield was positively correlated with level of aphid parasitism, ladybird beetle population and number of pods per plant, and strongly negatively correlated with aphid population. In conclusion, a fresh extract of hot pepper sprayed at the rate of 70 ml/4 m2 was selected for further research on rate, frequency and cost of application.

Keywords

botanicalsdetergentkerosenepirimicarbpea aphidgrass peaAcyrthosiphon pisumLathyrus sativusEthiopia
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 24 , Issue 2 , June 2004 , pp. 143 - 149
Copyright
Copyright © ICIPE 2004

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References

ECSA (Ethiopian Central Statistical Authority) (1998) Agricultural sample survey, area and production of major crops. Statistical bulletin no.189ECSA Addis Ababa, Ethiopia. 130 pp.Google Scholar
Freed, R. D. (1990) MSTATC version 1.2 Michigan State University, Michigan, USA.Google Scholar
Kemal, A. (1997) Economic threshold for pea aphid. Pest Manage. J. Ethiop., 1, 63–68.Google Scholar
Kemal, A. and Tadesse, G. (1990) The pea aphid: An important pest of field pea. Ethiop. Inst. Agric. Res. Newsletter, 5, 1–2.Google Scholar
Kemal, A. and Tibebu, H. (1994) Research on insect pests of In cool season food legumes, pp. 367–398. In Cool Season Food Legumes of Ethiopia (Edited by Asfaw, T., Geletu, B., Saxena, M. C. and Solh, M. B.). 1993 Proceedings of the First National Cool Season Food legumes Review Conference, 16–20 December 1993. ICARDA/Institute of Agricultural Research. ICARDA, Aleppo, Syria Addis Ababa, Ethiopia.Google Scholar
Melaku, W., Melkamu, A. and Fentahun, M. (1998) Research on insect pests and diseases of field crops in northwestern Ethiopia, 89–96. In Agricultural Research and Technology Transfer Attempts and Achievements in Northern Ethiopia (Edited by Beyene, S., and Abera, D.) Proceedings of the Fourth Technology Generation, Transfer and Gap Analysis Workshop, 18–21 March 1997, Bahir Dar, Ethiopia Ethiopian Agricultural Research Organization Addis Ababa.Google Scholar
Rappaport, R. (1992) Controlling Crop Pests and Diseases. Macmillan, Hong Kong. 106 pp.Google Scholar
Stoll, G. (2000) Natural Crop Protection in the Tropics: Letting Information Come to Life. Margraf Verlag, Weikersheim. 378 pp.Google Scholar
Woldeamlak, A. and Aleligne, K. (1990) Status of grass pea ( Lathyrus sativus ) production in Ethiopia. Ethiop. Inst. Agric. Res. Newsletter, 5, 4–7.Google Scholar