Farmers examining yields of wheat. Reduction of wheat spraying against aphids from 2 to 0.5 in recent years did not reduce yields. - - Development and Application of Integrated Pest Management (vegetables, wheat and cotton) Khartoum, Sudan: GCP/SUD/025/NET. This Integrated Pest Management Project was initiated in 1979 and is now in the fourth phase. The project aims to promote the development and application of safer, more effective permenent pest control procedures and techniques.