1. Aalders AJG, Pieters R (1987) Resistance in Vicia faba to Orobanche crenata: True resistance versus hidden susceptibility. Euphytica 36:227–236
2. Abebe G, Sahile G, Al-Tawaha ARM (2005) Evaluation of potential trap crops on Orobanche soil seed bank and tomato yield in the Central Rift Valley of Ethiopia. World J Agric Sci 1:148–151
3. Alford ER, Perry LG, Qin B, Vivanco JM, Paschke MW (2007) A putative allelopathic agent of Russian knapweed occurs in invaded soils. Soil Biol Biochem 39:1812–1815
4. Al-Khatib K, Libbey C, Boydston R (1997) Weed suppression with Brassica manure and cover crops in green peas. Weed Sci 45:439–445
5. Altieri MA, Liebman MZ (1986) Insect, weeds and plant disease management in multiple cropping systems. In: Francis CA (ed) Multiple cropping systems. MacMillan, New York, pp 183–218