Control of Cereal Aphids on Wheat in People’s Democratic Republic of Yemen
Loss estimates for wheat insects in Africa and Asia have not received adequate attention. However, in PDR of Yemen, pests including insects, diseases, weeds and birds can cause 10–70% loss of wheat crop. Aphids are considered to be the major insect pests of wheat in the country. A survey of indigenous natural enemies has shown that they may contribute to overall aphid control. Sowing date experiments have shown that sowing in November led to higher yields and lower insect infestation than sowing in October and December. The insecticides tested achieved a significant control of aphids and higher yields when compared with unsprayed plots. A single application of malathion or dimethoate before mid-January was recommended for chemical control.
Key WordsCereal aphids sowing dates chemical control PDR Yemen
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- Ba-Angood S. A. (1975) Wheat improvement in People’s Democratic Republic of Yemen. In Proceedings of the Third Regional Wheat Workshop, 28 April–2 May, 1975, pp. 352–354.Google Scholar
- Cramer H. H. (1967) Plant protection and world crop production. PflSchutz-Nachr. Bayer 20, 1–524.Google Scholar
- George, K. S. (1975) The establishment of economic damage thresholds with particular reference to cereal aphids. Proceedings of the 8th British Insecticide Conference, pp. 79–85.Google Scholar
- Kolbe, W. (1969) Studies on the occurrence of different aphid species as the cause of cereal yield and quality losses. PflSchutz-Nachr. Bayer 22, 171–204.Google Scholar
- Kolbe, W. (1970) Further studies on the reduction of cereal yields by cereal aphid infestation. PflSchutz-Nachr. Bayer 23, 144–162.Google Scholar
- Rautapaa, J. (1966) The effect of the English grain aphid Macrosiphum avenae (F.) (Horn., Aphididae) on the yield and quality of wheat. Ann. agric. Fenn. 5, 334–341.Google Scholar
- Rautappaa, J. (1975) Control of Rhopalosiphum padi (L.) (Horn., Aphididae) with Coccinella septempunctata L. (Col. Coccinellidae) in cages, and effect of late aphid infestation on barley yield. Ann. agric. Fenn. 14, 231–239.Google Scholar
- Saari, E. E. (1981) Wheat in the developing countries from the Atlantic to the Pacific. In Proceedings of Symposia IX International Congress of Plant Protection (Edited by Kommedahl, T.), pp. 437–441, Washington, D.C.Google Scholar
- Schmutterrer, H. (1969) Pests of crops in Northeast and Central Africa with Particular Reference to the Sudan, 1st edn. Gustav-Fisher, Verlag, Stuttgart.Google Scholar
- Smith, H. C and Allen, J. D. (1962) Control of yellow dwarf virus in wheat. N.Z. Jl Agric. 105, 502–505.Google Scholar
- Zaazou, M. H., Mahfood, S. A. and Ba-Angood, S. A. (1976) Cereal Pests and Their Control in PDRY, Technical Report No. 5. UNDP/FAO Improvement of Crop Production Project.Google Scholar